[1] The Châteauguay River Basin delineates a transborder watershed with roughly half of its surface area located in northern New York State and half in southern Québec Province, Canada. As part of a multidisciplinary study designed to characterize the hydrogeologic properties of this basin, geophysical logs were obtained in 12 wells strategically located to penetrate the four major sedimentary rock formations that constitute the regional aquifers. The layered rocks were classified according to their elastic properties into three primary units: soft sandstone, hard sandstone, and dolostone. Downhole measurements were analyzed to identify fracture patterns associated with each unit and to evaluate their role in controlling groundwater flow. Fracture networks are composed of orthogonal sets of laterally extensive, subhorizontal bedding plane partings and bed-delimited, subvertical joints with spacings that are consistent with rock mechanics principles and stress models. The vertical distribution of transmissive zones is confined to a few select bedding plane fractures, with soft sandstone having the fewest (one per 70-m depth) and hard sandstone the most (five per 70-m depth). Bed-normal permeability is examined using a probabilistic model that considers the lengths of flow paths winding along joints and bedding plane fractures. Soft sandstone has the smallest bed-normal permeability primarily because of its wide, geomechanically undersaturated joint spacing. Results indicate that the three formations have similar values of bulk transmissivity, within roughly an order of magnitude, but that each rock unit has its own unique system of groundwater flow paths that constitute that transmissivity.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2006JB004485","issn":"01480227","usgsCitation":"Morin, R.H., Godin, R., Nastev, M., and Rouleau, A., 2007, Hydrogeologic controls imposed by mechanical stratigraphy in layered rocks of the Chateauguay River Basin, a U.S.-Canada transborder aquifer: Journal of Geophysical Research B: Solid Earth, v. 112, no. 4, B04403, 12 p., https://doi.org/10.1029/2006JB004485.","productDescription":"B04403, 12 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":240244,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Canada, United States","otherGeospatial":"Chateauguay River Basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -75.146484375,\n 44.75453548416007\n ],\n [\n -73.355712890625,\n 44.75453548416007\n ],\n [\n -73.355712890625,\n 45.706179285330855\n ],\n [\n -75.146484375,\n 45.706179285330855\n ],\n [\n -75.146484375,\n 44.75453548416007\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"112","issue":"4","noUsgsAuthors":false,"publicationDate":"2007-04-06","publicationStatus":"PW","scienceBaseUri":"505a33a2e4b0c8380cd5f132","contributors":{"authors":[{"text":"Morin, Roger H. rhmorin@usgs.gov","contributorId":2432,"corporation":false,"usgs":true,"family":"Morin","given":"Roger","email":"rhmorin@usgs.gov","middleInitial":"H.","affiliations":[],"preferred":true,"id":424526,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Godin, Rejean","contributorId":19780,"corporation":false,"usgs":true,"family":"Godin","given":"Rejean","email":"","affiliations":[],"preferred":false,"id":424528,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Nastev, Miroslav","contributorId":10621,"corporation":false,"usgs":true,"family":"Nastev","given":"Miroslav","email":"","affiliations":[],"preferred":false,"id":424527,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rouleau, Alain","contributorId":84165,"corporation":false,"usgs":true,"family":"Rouleau","given":"Alain","email":"","affiliations":[],"preferred":false,"id":424529,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70032213,"text":"70032213 - 2007 - Comparative lahar hazard mapping at Volcan Citlaltépetl, Mexico using SRTM, ASTER and DTED-1 digital topographic data","interactions":[],"lastModifiedDate":"2015-04-13T09:38:33","indexId":"70032213","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2499,"text":"Journal of Volcanology and Geothermal Research","active":true,"publicationSubtype":{"id":10}},"title":"Comparative lahar hazard mapping at Volcan Citlaltépetl, Mexico using SRTM, ASTER and DTED-1 digital topographic data","docAbstract":"In this study, we evaluated and compared the utility of spaceborne SRTM and ASTER DEMs with baseline DTED-1 “bald-earth” topography for mapping lahar inundation hazards from volcan Citlaltépetl, Mexico, a volcano which has had a history of producing debris flows of various extents. In particular, we tested the utility of these topographic datasets for resolving ancient valley-filling deposits exposed around the flanks of the volcano, for determining their magnitude using paleohydrologic methods and for forecasting their inundation limits in the future. We also use the three datasets as inputs to a GIS stream inundation flow model, LAHARZ, and compare the results.
\nIn general all three datasets, with spatial resolution of 90 m or better, were capable of resolving debris flow and lahar deposits at least 3 × 106 m3 in volume or larger. Canopy- and slope-related height errors in the ASTER and SRTM DEMs limit their utility for measuring valley-filling cross-sectional area and deriving flow magnitude for the smallest deposits using a cross-sectional area to volume scaling equation. Height errors in the ASTER and SRTM DEMs also causes problems in resolving stream valley hydrography which controls lahar flow paths and stream valley morphology which controls lahar filling capacity. However, both of the two spaceborne DEM datasets are better than DTED-1 at resolving fine details in stream hydrography and erosional morphologies of volcaniclastics preserved in the valleys around the more humid, eastern flanks of the volcanic range.
\nThe results of LAHARZ flow inundation modeling using all three DEMs as inputs are remarkably similar and co-validate one another. For example, at Citlaltépetl all lahar simulations show that the city of Orizaba is the most vulnerable to flows similar in magnitude to, or larger than, one that occurred in 1920. Many of the other cities and towns illustrated are built higher up on terrace deposits of older debris flows, and are safe from all but the largest flows, which occur less frequently.
\nFinally, ASTERs 60 km swath width and 8% duty cycle presents a challenge for mapping lahar inundation hazards at E–W oriented stream valleys in low-latitude areas with persistent cloud cover. However, its continued operations enhances its utility as a means for updating the continuous but one-time coverage of SRTM, and for filling voids in the SRTM dataset such as those that occur along steep-sided valleys prone to hazards from future lahars.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.jvolgeores.2006.09.005","issn":"03770273","usgsCitation":"Hubbard, B.E., Sheridan, M.F., Carrasco-Nunez, G., Diaz-Castellon, R., and Rodriguez, S.R., 2007, Comparative lahar hazard mapping at Volcan Citlaltépetl, Mexico using SRTM, ASTER and DTED-1 digital topographic data: Journal of Volcanology and Geothermal Research, v. 160, no. 1-2, p. 99-124, https://doi.org/10.1016/j.jvolgeores.2006.09.005.","productDescription":"26 p.","startPage":"99","endPage":"124","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":242370,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":214628,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jvolgeores.2006.09.005"}],"volume":"160","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f81ee4b0c8380cd4cebb","contributors":{"authors":[{"text":"Hubbard, Bernard E. 0000-0002-9315-2032 bhubbard@usgs.gov","orcid":"https://orcid.org/0000-0002-9315-2032","contributorId":2342,"corporation":false,"usgs":true,"family":"Hubbard","given":"Bernard","email":"bhubbard@usgs.gov","middleInitial":"E.","affiliations":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":435064,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sheridan, Michael F.","contributorId":59413,"corporation":false,"usgs":true,"family":"Sheridan","given":"Michael","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":435061,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Carrasco-Nunez, Gerardo","contributorId":44714,"corporation":false,"usgs":true,"family":"Carrasco-Nunez","given":"Gerardo","email":"","affiliations":[],"preferred":false,"id":435063,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Diaz-Castellon, Rodolfo","contributorId":37936,"corporation":false,"usgs":true,"family":"Diaz-Castellon","given":"Rodolfo","email":"","affiliations":[],"preferred":false,"id":435062,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Rodriguez, Sergio R.","contributorId":35529,"corporation":false,"usgs":true,"family":"Rodriguez","given":"Sergio","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":435060,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70030192,"text":"70030192 - 2007 - First documentation of tidal-channel sponge biostromes (upper Pleistocene, southeastern Florida)","interactions":[],"lastModifiedDate":"2012-03-12T17:21:10","indexId":"70030192","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1796,"text":"Geology","active":true,"publicationSubtype":{"id":10}},"title":"First documentation of tidal-channel sponge biostromes (upper Pleistocene, southeastern Florida)","docAbstract":"Sponges are not a common principal component of Cenozoic reefs and are more typically dominant in deep-water and/or cold-water localities. Here we report the discovery of extensive upper Pleistocene shallow-marine, tropical sponge biostromes from the Mami Limestone of southeastern Florida built by a new ceractinomorph demosponge. These upright, barrel- to vase-shaped sponges occur in monospecific aggregations constructed within the tidal channels of an oolitic tidal-bar belt similar to modern examples on the Great Bahama Bank. The biostromes appear to have a ribbon-like geometry, with densely spaced sponges populating a paleochannel along a 3.5 km extent in the most lengthy biostrome. These are very large (as high as 2 m and 1.8 m in diameter), particularly well-preserved calcified sponges with walls as hard as concrete. Quartz grains are the most common particles agglutinated in the structure of the sponge walls. Where exposed, sediment fill between the sponges is commonly a highly burrowed or cross-bedded ooid-bearing grainstone and, locally, quartz sand. It is postulated that the dense, localized distribution of these particular sponges was due to a slight edge over competitors for food or energy supply and space in a stressed environment of tidal-influenced salinity and nutrient changes, strong currents, and frequently shifting submarine sand dunes. To our knowledge, this represents the first documentation of sponge biostromes composed of very large upright sponges within high-energy tidal channels between ooid shoals. The remarkably well-preserved accumulations provide an alternative example of sponge reefs for comparative paleoenvironmental studies. ?? 2007 The Geological Society of America.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1130/G23402A.1","issn":"00917613","usgsCitation":"Cunningham, K., Rigby, J., Wacker, M., and Curran, H., 2007, First documentation of tidal-channel sponge biostromes (upper Pleistocene, southeastern Florida): Geology, v. 35, no. 5, p. 475-478, https://doi.org/10.1130/G23402A.1.","startPage":"475","endPage":"478","numberOfPages":"4","costCenters":[],"links":[{"id":212112,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1130/G23402A.1"},{"id":239537,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"35","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a1052e4b0c8380cd53c12","contributors":{"authors":[{"text":"Cunningham, K.J.","contributorId":39852,"corporation":false,"usgs":true,"family":"Cunningham","given":"K.J.","email":"","affiliations":[],"preferred":false,"id":426076,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Rigby, J.K.","contributorId":40332,"corporation":false,"usgs":true,"family":"Rigby","given":"J.K.","email":"","affiliations":[],"preferred":false,"id":426077,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wacker, M.A.","contributorId":91168,"corporation":false,"usgs":true,"family":"Wacker","given":"M.A.","email":"","affiliations":[],"preferred":false,"id":426078,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Curran, H.A.","contributorId":30820,"corporation":false,"usgs":true,"family":"Curran","given":"H.A.","email":"","affiliations":[],"preferred":false,"id":426075,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70032796,"text":"70032796 - 2007 - Phase equilibria constraints on the chemical and physical evolution of the campanian ignimbrite","interactions":[],"lastModifiedDate":"2012-03-12T17:21:24","indexId":"70032796","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2420,"text":"Journal of Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Phase equilibria constraints on the chemical and physical evolution of the campanian ignimbrite","docAbstract":"The Campanian Ignimbrite is a > 200 km3 trachyte-phonolite pyroclastic deposit that erupted at 39.3 ?? 0.1 ka within the Campi Flegrei west of Naples, Italy. Here we test the hypothesis that Campanian Ignimbrite magma was derived by isobaric crystal fractionation of a parental basaltic trachyandesitic melt that reacted and came into local equilibrium with small amounts (5-10 wt%) of crustal rock (skarns and foid-syenites) during crystallization. Comparison of observed crystal and magma compositions with results of phase equilibria assimilation-fractionation simulations (MELTS) is generally very good. Oxygen fugacity was approximately buffered along QFM+1 (where QFM is the quartz-fayalite-magnetite buffer) during isobaric fractionation at 0.15 GPa (???6 km depth). The parental melt, reconstructed from melt inclusion and host clinopyroxene compositions, is found to be basaltic trachyandesite liquid (51.1 wt% SiO2, 9.3 wt% MgO, 3 wt% H2O). A significant feature of phase equilibria simulations is the existence of a pseudo-invariant temperature, ???883??C, at which the fraction of melt remaining in the system decreases abruptly from ???0.5 to < 0.1. Crystallization at the pseudo-invariant point leads to abrupt changes in the composition, properties (density, dissolved water content), and physical state (viscosity, volume fraction fluid) of melt and magma. A dramatic decrease in melt viscosity (from 1700 Pa s to ???200 Pa s), coupled with a change in the volume fraction of water in magma (from ??? 0.1 to 0.8) and a dramatic decrease in melt and magma density acted as a destabilizing eruption trigger. Thermal models suggest a timescale of ??? 200 kyr from the beginning of fractionation until eruption, leading to an apparent rate of evolved magma generation of about 10-3 km3/year. In situ crystallization and crystal settling in density-stratified regions, as well as in convectively mixed, less evolved subjacent magma, operate rapidly enough to match this apparent volumetric rate of evolved magma production. ?? Copyright 2007 Oxford University Press.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Petrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1093/petrology/egl068","issn":"00223530","usgsCitation":"Fowler, S.J., Spera, F., Bohrson, W., Belkin, H., and de Vivo, B., 2007, Phase equilibria constraints on the chemical and physical evolution of the campanian ignimbrite: Journal of Petrology, v. 48, no. 3, p. 459-493, https://doi.org/10.1093/petrology/egl068.","startPage":"459","endPage":"493","numberOfPages":"35","costCenters":[],"links":[{"id":477036,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1093/petrology/egl068","text":"Publisher Index Page"},{"id":241430,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213772,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1093/petrology/egl068"}],"volume":"48","issue":"3","noUsgsAuthors":false,"publicationDate":"2006-11-13","publicationStatus":"PW","scienceBaseUri":"505a787ae4b0c8380cd786e4","contributors":{"authors":[{"text":"Fowler, S. J.","contributorId":18586,"corporation":false,"usgs":false,"family":"Fowler","given":"S.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":437944,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Spera, F. J.","contributorId":89315,"corporation":false,"usgs":false,"family":"Spera","given":"F. J.","affiliations":[],"preferred":false,"id":437947,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bohrson, W.A.","contributorId":102092,"corporation":false,"usgs":false,"family":"Bohrson","given":"W.A.","affiliations":[],"preferred":false,"id":437948,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Belkin, H. E. 0000-0001-7879-6529","orcid":"https://orcid.org/0000-0001-7879-6529","contributorId":38160,"corporation":false,"usgs":true,"family":"Belkin","given":"H. E.","affiliations":[],"preferred":false,"id":437945,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"de Vivo, B.","contributorId":50549,"corporation":false,"usgs":false,"family":"de Vivo","given":"B.","affiliations":[],"preferred":false,"id":437946,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70030182,"text":"70030182 - 2007 - Errors in acoustic doppler profiler velocity measurements caused by flow disturbance","interactions":[],"lastModifiedDate":"2012-03-12T17:21:01","indexId":"70030182","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2338,"text":"Journal of Hydraulic Engineering","active":true,"publicationSubtype":{"id":10}},"title":"Errors in acoustic doppler profiler velocity measurements caused by flow disturbance","docAbstract":"Acoustic Doppler current profilers (ADCPs) are commonly used to measure streamflow and water velocities in rivers and streams. This paper presents laboratory, field, and numerical model evidence of errors in ADCP measurements caused by flow disturbance. A state-of-the-art three-dimensional computational fluid dynamic model is validated with and used to complement field and laboratory observations of flow disturbance and its effect on measured velocities. Results show that near the instrument, flow velocities measured by the ADCP are neither the undisturbed stream velocity nor the velocity of the flow field around the ADCP. The velocities measured by the ADCP are biased low due to the downward flow near the upstream face of the ADCP and upward recovering flow in the path of downstream transducer, which violate the flow homogeneity assumption used to transform beam velocities into Cartesian velocity components. The magnitude of the bias is dependent on the deployment configuration, the diameter of the instrument, and the approach velocity, and was observed to range from more than 25% at 5cm from the transducers to less than 1% at about 50cm from the transducers for the scenarios simulated. ?? 2007 ASCE.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydraulic Engineering","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1061/(ASCE)0733-9429(2007)133:12(1411)","issn":"07339429","usgsCitation":"Mueller, D.S., Abad, J., Garcia, C., Gartner, J.W., Garcia, M., and Oberg, K.A., 2007, Errors in acoustic doppler profiler velocity measurements caused by flow disturbance: Journal of Hydraulic Engineering, v. 133, no. 12, p. 1411-1420, https://doi.org/10.1061/(ASCE)0733-9429(2007)133:12(1411).","startPage":"1411","endPage":"1420","numberOfPages":"10","costCenters":[],"links":[{"id":211968,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1061/(ASCE)0733-9429(2007)133:12(1411)"},{"id":239361,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"133","issue":"12","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0a4ae4b0c8380cd522b8","contributors":{"authors":[{"text":"Mueller, D. S.","contributorId":51338,"corporation":false,"usgs":true,"family":"Mueller","given":"D.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":426046,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Abad, J.D.","contributorId":66064,"corporation":false,"usgs":true,"family":"Abad","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":426047,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Garcia, C.M.","contributorId":84159,"corporation":false,"usgs":true,"family":"Garcia","given":"C.M.","email":"","affiliations":[],"preferred":false,"id":426050,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Gartner, J. W.","contributorId":81903,"corporation":false,"usgs":false,"family":"Gartner","given":"J.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":426049,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Garcia, M.H.","contributorId":45079,"corporation":false,"usgs":true,"family":"Garcia","given":"M.H.","email":"","affiliations":[],"preferred":false,"id":426045,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Oberg, K. A.","contributorId":67553,"corporation":false,"usgs":true,"family":"Oberg","given":"K.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":426048,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70031514,"text":"70031514 - 2007 - Aeromagnetic mapping of the structure of Pine Canyon caldera and Chisos Mountains intrusion, Big Bend National Park, Texas","interactions":[],"lastModifiedDate":"2012-03-12T17:21:10","indexId":"70031514","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Aeromagnetic mapping of the structure of Pine Canyon caldera and Chisos Mountains intrusion, Big Bend National Park, Texas","docAbstract":"Analysis of aeromagnetic and gravity data reveals new details of the structure, igneous geology, and temporal evolution of the prominent, enigmatic ca.32 Ma Pine Canyon caldera and the Chisos Mountains (Big Bend National Park, Texas). The main caldera-filling Pine Canyon Rhyolite, the oldest member of the South Rim Formation, is reversely magnetized, allowing it to be used as a key marker bed for determining caldera fill thickness. Modeling of gravity and magnetic anomalies indicates that the Pine Canyon Rhyolite is probably thicker in the northeastern part of the caldera. Lineaments in the magnetic data suggest the presence of buried faults beneath the caldera that may have led to increased downdrop in the northeast versus the southwest, allowing a thicker section of caldera fill to accumulate there. The Pine Canyon caldera has been interpreted as a downsag caldera because it lacks surficial faulting, so these inferred faults are the first mapped features there that could be responsible for caldera collapse. The caldera boundary correlates well with the margins of a gravity low. General features of the caldera match well with basic models of downsag calderas, meaning that the Pine Canyon caldera may be a classic example of downsagging, of which few well-described examples exist, in terms of a geophysical signature. The source of a long-wavelength magnetic high over the Chisos Mountains is interpreted as a previously unknown broad intrusion, the long axis of which trends parallel to a major crustal boundary related to the Ouachita orogeny or an even earlier Precambrian margin. This feature represents the largest intrusion (28-34 km diameter, 1-4 km thick, 700-3000 km3 in volume) in an area where relatively small laccoliths are ubiquitous. The intrusion most likely represents a long-lived (>1 m.y.) reservoir replenished by small batches of magma of varying composition, as reflected in the variation of eruptive products from the Pine Canyon and Sierra Quemada calderas. The intrusion may represent the easternmost occurrence of voluminous Tertiary magmatism in the southwestern United States. ?? 2007 Geological Society of America.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geological Society of America Bulletin","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1130/B26150.1","issn":"00167606","usgsCitation":"Drenth, B., and Finn, C., 2007, Aeromagnetic mapping of the structure of Pine Canyon caldera and Chisos Mountains intrusion, Big Bend National Park, Texas: Geological Society of America Bulletin, v. 119, no. 11-12, p. 1521-1534, https://doi.org/10.1130/B26150.1.","startPage":"1521","endPage":"1534","numberOfPages":"14","costCenters":[],"links":[{"id":212354,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1130/B26150.1"},{"id":239825,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"119","issue":"11-12","noUsgsAuthors":false,"publicationDate":"2007-11-02","publicationStatus":"PW","scienceBaseUri":"5059e89ee4b0c8380cd47dee","contributors":{"authors":[{"text":"Drenth, B. J.","contributorId":49885,"corporation":false,"usgs":true,"family":"Drenth","given":"B. J.","affiliations":[],"preferred":false,"id":431876,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Finn, C. A. 0000-0002-6178-0405","orcid":"https://orcid.org/0000-0002-6178-0405","contributorId":93917,"corporation":false,"usgs":true,"family":"Finn","given":"C. A.","affiliations":[],"preferred":false,"id":431877,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70031272,"text":"70031272 - 2007 - Forest dynamics in Oregon landscapes: Evaluation and application of an individual-based model","interactions":[],"lastModifiedDate":"2012-03-12T17:21:13","indexId":"70031272","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1450,"text":"Ecological Applications","active":true,"publicationSubtype":{"id":10}},"title":"Forest dynamics in Oregon landscapes: Evaluation and application of an individual-based model","docAbstract":"The FORCLIM model of forest dynamics was tested against field survey data for its ability to simulate basal area and composition of old forests across broad climatic gradients in western Oregon, USA. The model was also tested for its ability to capture successional trends in ecoregions of the west Cascade Range. It was then applied to simulate present and future (1990-2050) forest landscape dynamics of a watershed in the west Cascades. Various regimes of climate change and harvesting in the watershed were considered in the landscape application. The model was able to capture much of the variation in forest basal area and composition in western Oregon even though temperature and precipitation were the only inputs that were varied among simulated sites. The measured decline in total basal area from tall coastal forests eastward to interior steppe was matched by simulations. Changes in simulated forest dominants also approximated those in the actual data. Simulated abundances of a few minor species did not match actual abundances, however. Subsequent projections of climate change and harvest effects in a west Cascades landscape indicated no change in forest dominance as of 2050. Yet, climate-driven shifts in the distributions of some species were projected. The simulation of both stand-replacing and partial-stand disturbances across western Oregon improved agreement between simulated and actual data. Simulations with fire as an agent of partial disturbance suggested that frequent fires of low severity can alter forest composition and structure as much or more than severe fires at historic frequencies. ?? 2007 by the Ecological Society of America.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecological Applications","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1890/06-1838.1","issn":"10510761","usgsCitation":"Busing, R.T., Solomon, A., McKane, R., and Burdick, C., 2007, Forest dynamics in Oregon landscapes: Evaluation and application of an individual-based model: Ecological Applications, v. 17, no. 7, p. 1967-1981, https://doi.org/10.1890/06-1838.1.","startPage":"1967","endPage":"1981","numberOfPages":"15","costCenters":[],"links":[{"id":212428,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1890/06-1838.1"},{"id":239916,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"17","issue":"7","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a1331e4b0c8380cd5455b","contributors":{"authors":[{"text":"Busing, R. T.","contributorId":72162,"corporation":false,"usgs":true,"family":"Busing","given":"R.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":430845,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Solomon, A.M.","contributorId":71721,"corporation":false,"usgs":true,"family":"Solomon","given":"A.M.","email":"","affiliations":[],"preferred":false,"id":430844,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McKane, R.B.","contributorId":88558,"corporation":false,"usgs":true,"family":"McKane","given":"R.B.","email":"","affiliations":[],"preferred":false,"id":430846,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Burdick, C.A.","contributorId":51984,"corporation":false,"usgs":true,"family":"Burdick","given":"C.A.","email":"","affiliations":[],"preferred":false,"id":430843,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70031535,"text":"70031535 - 2007 - Generalization of von Neumann analysis for a model of two discrete half-spaces: The acoustic case","interactions":[],"lastModifiedDate":"2012-03-12T17:21:09","indexId":"70031535","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1808,"text":"Geophysics","active":true,"publicationSubtype":{"id":10}},"title":"Generalization of von Neumann analysis for a model of two discrete half-spaces: The acoustic case","docAbstract":"Evaluating the performance of finite-difference algorithms typically uses a technique known as von Neumann analysis. For a given algorithm, application of the technique yields both a dispersion relation valid for the discrete time-space grid and a mathematical condition for stability. In practice, a major shortcoming of conventional von Neumann analysis is that it can be applied only to an idealized numerical model - that of an infinite, homogeneous whole space. Experience has shown that numerical instabilities often arise in finite-difference simulations of wave propagation at interfaces with strong material contrasts. These interface instabilities occur even though the conventional von Neumann stability criterion may be satisfied at each point of the numerical model. To address this issue, I generalize von Neumann analysis for a model of two half-spaces. I perform the analysis for the case of acoustic wave propagation using a standard staggered-grid finite-difference numerical scheme. By deriving expressions for the discrete reflection and transmission coefficients, I study under what conditions the discrete reflection and transmission coefficients become unbounded. I find that instabilities encountered in numerical modeling near interfaces with strong material contrasts are linked to these cases and develop a modified stability criterion that takes into account the resulting instabilities. I test and verify the stability criterion by executing a finite-difference algorithm under conditions predicted to be stable and unstable. ?? 2007 Society of Exploration Geophysicists.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geophysics","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1190/1.2750639","issn":"00168033","usgsCitation":"Haney, M., 2007, Generalization of von Neumann analysis for a model of two discrete half-spaces: The acoustic case: Geophysics, v. 72, no. 5, https://doi.org/10.1190/1.2750639.","costCenters":[],"links":[{"id":212628,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1190/1.2750639"},{"id":240143,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"72","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a1514e4b0c8380cd54caa","contributors":{"authors":[{"text":"Haney, M.M.","contributorId":72597,"corporation":false,"usgs":true,"family":"Haney","given":"M.M.","email":"","affiliations":[],"preferred":false,"id":431992,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70031720,"text":"70031720 - 2007 - Identifying biotic integrity and water chemistry relations in nonwadeable rivers of Wisconsin: Toward the development of nutrient criteria","interactions":[],"lastModifiedDate":"2018-02-06T12:19:59","indexId":"70031720","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1547,"text":"Environmental Management","active":true,"publicationSubtype":{"id":10}},"title":"Identifying biotic integrity and water chemistry relations in nonwadeable rivers of Wisconsin: Toward the development of nutrient criteria","docAbstract":"We sampled 41 sites on 34 nonwadeable rivers that represent the types of rivers in Wisconsin, and the kinds and intensities of nutrient and other anthropogenic stressors upon each river type. Sites covered much of United States Environmental Protection Agency national nutrient ecoregions VII-Mostly Glaciated Dairy Region, and VIII-Nutrient Poor, Largely Glaciated upper Midwest. Fish, macroinvertebrates, and three categories of environmental variables including nutrients, other water chemistry, and watershed features were collected using standard protocols. We summarized fish assemblages by index of biotic integrity (IBI) and its 10 component measures, and macroinvertebrates by 2 organic pollution tolerance and 12 proportional richness measures. All biotic and environmental variables represented a wide range of conditions, with biotic measures ranging from poor to excellent status, despite nutrient concentrations being consistently higher than reference concentrations reported for the regions. Regression tree analyses of nutrients on a suite of biotic measures identified breakpoints in total phosphorus (~0.06 mg/l) and total nitrogen (~0.64 mg/l) concentrations at which biotic assemblages were consistently impaired. Redundancy analyses (RDA) were used to identify the most important variables within each of the three environmental variable categories, which were then used to determine the relative influence of each variable category on the biota. Nutrient measures, suspended chlorophyll a, water clarity, and watershed land cover type (forest or row-crop agriculture) were the most important variables and they explained significant amounts of variation within the macroinvertebrate (R 2 = 60.6%) and fish (R 2 = 43.6%) assemblages. The environmental variables selected in the macroinvertebrate model were correlated to such an extent that partial RDA analyses could not attribute variation explained to individual environmental categories, assigning 89% of the explained variation to interactions among the categories. In contrast, partial RDA attributed much of the explained variation to the nutrient (25%) and other water chemistry (38%) categories for the fish model. Our analyses suggest that it would be beneficial to develop criteria based upon a suite of biotic and nutrient variables simultaneously to deem waters as not meeting their designated uses. ?? 2007 Springer Science+Business Media, LLC.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Environmental Management","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s00267-006-0452-y","issn":"0364152X","usgsCitation":"Weigel, B., and Robertson, D.M., 2007, Identifying biotic integrity and water chemistry relations in nonwadeable rivers of Wisconsin: Toward the development of nutrient criteria: Environmental Management, v. 40, no. 4, p. 691-708, https://doi.org/10.1007/s00267-006-0452-y.","startPage":"691","endPage":"708","numberOfPages":"18","costCenters":[],"links":[{"id":239874,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212397,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s00267-006-0452-y"}],"volume":"40","issue":"4","noUsgsAuthors":false,"publicationDate":"2007-07-18","publicationStatus":"PW","scienceBaseUri":"505a3849e4b0c8380cd614f3","contributors":{"authors":[{"text":"Weigel, B.M.","contributorId":96483,"corporation":false,"usgs":true,"family":"Weigel","given":"B.M.","email":"","affiliations":[],"preferred":false,"id":432850,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Robertson, Dale M. 0000-0001-6799-0596 dzrobert@usgs.gov","orcid":"https://orcid.org/0000-0001-6799-0596","contributorId":150760,"corporation":false,"usgs":true,"family":"Robertson","given":"Dale","email":"dzrobert@usgs.gov","middleInitial":"M.","affiliations":[{"id":37947,"text":"Upper Midwest Water Science Center","active":true,"usgs":true}],"preferred":true,"id":432849,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70031180,"text":"70031180 - 2007 - Ore controls in the Charters Towers goldfield, NE Australia: Constraints from geological, geophysical and numerical analyses","interactions":[],"lastModifiedDate":"2012-03-12T17:21:17","indexId":"70031180","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2954,"text":"Ore Geology Reviews","active":true,"publicationSubtype":{"id":10}},"title":"Ore controls in the Charters Towers goldfield, NE Australia: Constraints from geological, geophysical and numerical analyses","docAbstract":"The approach taken in this paper, namely synthesising a wealth of previous information with new data and a genetic model, in combination with integrated numerical analyses, led to new insights into the geological controls on the localisation of auriferous veins and residual prospectivity of the Charters Towers goldfield, NE Australia. The method also has implications for the assessment of other \"mature\" goldfields worldwide. Despite a number of different ore controls having operated within the Charters Towers goldfield, the controlling factors can be linked to a single genetic model for orogenic, granitoid-hosted lode-gold mineralisation in a brittle deformation regime (D4) of NE-SW to NNE-SSW shortening, under conditions of supralithostatic fluid pressure and low stress difference. Spatial autocorrelation results suggest district-scale alignment of the auriferous veins parallel to and overlapping with the ESE-WNW- to E-W-striking Charters Towers-Ravenswood lineament, a major crustal boundary in the basement to the Ravenswood batholith. At the camp-scale, auriferous veins have abundance and proximity relationships with NW-SE-, NNW-SSE-, NE-SW- and ENE-WSW-oriented lineaments, suggesting that structures that controlled gold deposition in one camp did not necessarily control mineralisation in other camps. Fractal dimensions obtained with the box-counting method range from 1.02 to 1.10, whereas veins in the Charters Towers City camp are characterised by a significantly higher fractal dimension of 1.28. This discrepancy may be taken to imply that most or all outcropping and near-surface deposits within the Charters Towers City camp have been found and that new discoveries are more likely to occur at greater levels of depth, or outside the boundaries of this camp. The new understanding has implications for the assessment of the residual prospectivity of the Charters Towers goldfield, where large areas of prospective rock types and structures (e.g., approximately 40% of the Charters Towers-Ravenswood lineament) are hidden under cover. This parameter space was inaccessible to the historic prospectors and has received relatively little attention from recent explorers. The following steps are suggested for the development of a targeting strategy for lode-gold exploration in areas of the goldfield under cover: (1) identify from geological and geophysical data the ENE-WSW (?? 15??) and NNW-SSE (?? 15??) striking structures and geological boundaries within a 20-km-wide corridor parallel to and centred upon the Charters Towers-Ravenswood lineament, the potential control on gold deposit distribution at the regional- to district-scale, (2) interpret from geological and geophysical data the distribution of pre-Middle Devonian granitoids within these areas that are the preferred host rocks of the payable gold deposits, (3) deduce from geophysical data the ENE-WSW (?? 15??) and NNW-SSE (?? 15??) striking structures that cut or bound the intrusions identified in step 2, (4) locate segments along the structures identified in step 3 that deviate most from the geometry of a straight line (e.g., potential bends or splays) and/or intersect other structures or geological contacts, or both, and (5) define and rank potential targets within the prospective areas identified in step 4 and systematically test the best ones. ?? 2006 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ore Geology Reviews","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.oregeorev.2006.12.001","issn":"01691368","usgsCitation":"Kreuzer, O., Blenkinsop, T., Morrison, R., and Peters, S.G., 2007, Ore controls in the Charters Towers goldfield, NE Australia: Constraints from geological, geophysical and numerical analyses: Ore Geology Reviews, v. 32, no. 1-2, p. 37-80, https://doi.org/10.1016/j.oregeorev.2006.12.001.","startPage":"37","endPage":"80","numberOfPages":"44","costCenters":[],"links":[{"id":211517,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.oregeorev.2006.12.001"},{"id":238817,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"32","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6f66e4b0c8380cd75a90","contributors":{"authors":[{"text":"Kreuzer, O.P.","contributorId":18576,"corporation":false,"usgs":true,"family":"Kreuzer","given":"O.P.","email":"","affiliations":[],"preferred":false,"id":430392,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Blenkinsop, T.G.","contributorId":69359,"corporation":false,"usgs":true,"family":"Blenkinsop","given":"T.G.","email":"","affiliations":[],"preferred":false,"id":430395,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Morrison, R.J.","contributorId":64885,"corporation":false,"usgs":true,"family":"Morrison","given":"R.J.","email":"","affiliations":[],"preferred":false,"id":430394,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Peters, S. G.","contributorId":48198,"corporation":false,"usgs":true,"family":"Peters","given":"S.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":430393,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70031530,"text":"70031530 - 2007 - Remote sensing-based predictors improve distribution models of rare, early successional and broadleaf tree species in Utah","interactions":[],"lastModifiedDate":"2012-03-12T17:21:09","indexId":"70031530","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2163,"text":"Journal of Applied Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Remote sensing-based predictors improve distribution models of rare, early successional and broadleaf tree species in Utah","docAbstract":"1. Compared to bioclimatic variables, remote sensing predictors are rarely used for predictive species modelling. When used, the predictors represent typically habitat classifications or filters rather than gradual spectral, surface or biophysical properties. Consequently, the full potential of remotely sensed predictors for modelling the spatial distribution of species remains unexplored. Here we analysed the partial contributions of remotely sensed and climatic predictor sets to explain and predict the distribution of 19 tree species in Utah. We also tested how these partial contributions were related to characteristics such as successional types or species traits. 2. We developed two spatial predictor sets of remotely sensed and topo-climatic variables to explain the distribution of tree species. We used variation partitioning techniques applied to generalized linear models to explore the combined and partial predictive powers of the two predictor sets. Non-parametric tests were used to explore the relationships between the partial model contributions of both predictor sets and species characteristics. 3. More than 60% of the variation explained by the models represented contributions by one of the two partial predictor sets alone, with topo-climatic variables outperforming the remotely sensed predictors. However, the partial models derived from only remotely sensed predictors still provided high model accuracies, indicating a significant correlation between climate and remote sensing variables. The overall accuracy of the models was high, but small sample sizes had a strong effect on cross-validated accuracies for rare species. 4. Models of early successional and broadleaf species benefited significantly more from adding remotely sensed predictors than did late seral and needleleaf species. The core-satellite species types differed significantly with respect to overall model accuracies. Models of satellite and urban species, both with low prevalence, benefited more from use of remotely sensed predictors than did the more frequent core species. 5. Synthesis and applications. If carefully prepared, remotely sensed variables are useful additional predictors for the spatial distribution of trees. Major improvements resulted for deciduous, early successional, satellite and rare species. The ability to improve model accuracy for species having markedly different life history strategies is a crucial step for assessing effects of global change. ?? 2007 The Authors.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Applied Ecology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1111/j.1365-2664.2007.01348.x","issn":"00218901","usgsCitation":"Zimmermann, N., Edwards, T., Moisen, G.G., Frescino, T., and Blackard, J., 2007, Remote sensing-based predictors improve distribution models of rare, early successional and broadleaf tree species in Utah: Journal of Applied Ecology, v. 44, no. 5, p. 1057-1067, https://doi.org/10.1111/j.1365-2664.2007.01348.x.","startPage":"1057","endPage":"1067","numberOfPages":"11","costCenters":[],"links":[{"id":487622,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1111/j.1365-2664.2007.01348.x","text":"Publisher Index Page"},{"id":212568,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1365-2664.2007.01348.x"},{"id":240071,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"44","issue":"5","noUsgsAuthors":false,"publicationDate":"2007-07-23","publicationStatus":"PW","scienceBaseUri":"505aa715e4b0c8380cd851f4","contributors":{"authors":[{"text":"Zimmermann, N.E.","contributorId":24547,"corporation":false,"usgs":true,"family":"Zimmermann","given":"N.E.","email":"","affiliations":[],"preferred":false,"id":431971,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Edwards, T.C. Jr. 0000-0002-0773-0909","orcid":"https://orcid.org/0000-0002-0773-0909","contributorId":76486,"corporation":false,"usgs":true,"family":"Edwards","given":"T.C.","suffix":"Jr.","affiliations":[],"preferred":false,"id":431972,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Moisen, Gretchen G.","contributorId":15781,"corporation":false,"usgs":false,"family":"Moisen","given":"Gretchen","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":431970,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Frescino, T.S.","contributorId":94485,"corporation":false,"usgs":true,"family":"Frescino","given":"T.S.","email":"","affiliations":[],"preferred":false,"id":431973,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Blackard, J.A.","contributorId":103060,"corporation":false,"usgs":true,"family":"Blackard","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":431974,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70031599,"text":"70031599 - 2007 - Evaluation of the applicability of the dual‐domain mass transfer model in porous media containing connected high‐conductivity channels","interactions":[],"lastModifiedDate":"2018-04-03T12:25:24","indexId":"70031599","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3722,"text":"Water Resources Research","onlineIssn":"1944-7973","printIssn":"0043-1397","active":true,"publicationSubtype":{"id":10}},"title":"Evaluation of the applicability of the dual‐domain mass transfer model in porous media containing connected high‐conductivity channels","docAbstract":"This paper evaluates the dual‐domain mass transfer (DDMT) model to represent transport processes when small‐scale high‐conductivity (K) preferential flow paths (PFPs) are present in a homogenous porous media matrix. The effects of PFPs upon solute transport were examined through detailed numerical experiments involving different realizations of PFP networks, PFP/matrix conductivity contrasts varying from 10:1 to 200:1, different magnitudes of effective conductivities, and a range of molecular diffusion coefficients. Results suggest that the DDMT model can reproduce both the near‐source peak and the downstream low‐concentration spreading observed in the embedded dendritic network when there are large conductivity contrasts between high‐K PFPs and the low‐K matrix. The accuracy of the DDMT model is also affected by the geometry of PFP networks and by the relative significance of the diffusion process in the network‐matrix system.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2007WR005965","usgsCitation":"Liu, G., Zheng, C., and Gorelick, S.M., 2007, Evaluation of the applicability of the dual‐domain mass transfer model in porous media containing connected high‐conductivity channels: Water Resources Research, v. 43, no. 12, Article W12407; 12 p., https://doi.org/10.1029/2007WR005965.","productDescription":"Article W12407; 12 p.","costCenters":[],"links":[{"id":477206,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2007wr005965","text":"Publisher Index Page"},{"id":240147,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"43","issue":"12","noUsgsAuthors":false,"publicationDate":"2007-12-20","publicationStatus":"PW","scienceBaseUri":"505a0cdce4b0c8380cd52d12","contributors":{"authors":[{"text":"Liu, Gaisheng","contributorId":15158,"corporation":false,"usgs":true,"family":"Liu","given":"Gaisheng","email":"","affiliations":[],"preferred":false,"id":432270,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Zheng, Chunmiao","contributorId":49233,"corporation":false,"usgs":true,"family":"Zheng","given":"Chunmiao","affiliations":[],"preferred":false,"id":432272,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Gorelick, Steven M.","contributorId":69295,"corporation":false,"usgs":true,"family":"Gorelick","given":"Steven","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":432271,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70030157,"text":"70030157 - 2007 - Developing a flood monitoring system from remotely sensed data for the Limpopo basin","interactions":[],"lastModifiedDate":"2017-01-18T13:56:14","indexId":"70030157","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1944,"text":"IEEE Transactions on Geoscience and Remote Sensing","active":true,"publicationSubtype":{"id":10}},"title":"Developing a flood monitoring system from remotely sensed data for the Limpopo basin","docAbstract":"This paper describes the application of remotely sensed precipitation to the monitoring of floods in a region that regularly experiences extreme precipitation and flood events, often associated with cyclonic systems. Precipitation data, which are derived from spaceborne radar aboard the National Aeronautics and Space Administration's Tropical Rainfall Measuring Mission and from National Oceanic and Atmospheric Administration's infrared-based products, are used to monitor areas experiencing extreme precipitation events that are defined as exceedance of a daily mean areal average value of 50 mm over a catchment. The remotely sensed precipitation data are also ingested into a hydrologic model that is parameterized using spatially distributed elevation, soil, and land cover data sets that are available globally from remote sensing and in situ sources. The resulting stream-flow is classified as an extreme flood event when flow anomalies exceed 1.5 standard deviations above the short-term mean. In an application in the Limpopo basin, it is demonstrated that the use of satellite-derived precipitation allows for the identification of extreme precipitation and flood events, both in terms of relative intensity and spatial extent. The system is used by water authorities in Mozambique to proactively initiate independent flood hazard verification before generating flood warnings. The system also serves as a supplementary information source when in situ gauging systems are disrupted. This paper concludes that remotely sensed precipitation and derived products greatly enhance the ability of water managers in the Limpopo basin to monitor extreme flood events and provide at-risk communities with early warning information. ?? 2007 IEEE.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"IEEE Transactions on Geoscience and Remote Sensing","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1109/TGRS.2006.883147","issn":"01962892","usgsCitation":"Asante, K., Macuacua, R., Artan, G.A., Lietzow, R., and Verdin, J., 2007, Developing a flood monitoring system from remotely sensed data for the Limpopo basin: IEEE Transactions on Geoscience and Remote Sensing, v. 45, no. 6, p. 1709-1714, https://doi.org/10.1109/TGRS.2006.883147.","startPage":"1709","endPage":"1714","numberOfPages":"6","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":240635,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213054,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1109/TGRS.2006.883147"}],"country":"South Africa","otherGeospatial":"Limpopo River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n 25.6640625,\n -25.641526373065755\n ],\n [\n 25.6640625,\n -22.06527806776582\n ],\n [\n 33.0029296875,\n -22.06527806776582\n ],\n [\n 33.0029296875,\n -25.641526373065755\n ],\n [\n 25.6640625,\n -25.641526373065755\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"45","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0009e4b0c8380cd4f553","contributors":{"authors":[{"text":"Asante, K.O. 0000-0001-5408-1852","orcid":"https://orcid.org/0000-0001-5408-1852","contributorId":17051,"corporation":false,"usgs":true,"family":"Asante","given":"K.O.","affiliations":[],"preferred":false,"id":425935,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Macuacua, R.D.","contributorId":22585,"corporation":false,"usgs":true,"family":"Macuacua","given":"R.D.","email":"","affiliations":[],"preferred":false,"id":425936,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Artan, G. A.","contributorId":50733,"corporation":false,"usgs":false,"family":"Artan","given":"G.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":425938,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Lietzow, R.W.","contributorId":58104,"corporation":false,"usgs":true,"family":"Lietzow","given":"R.W.","email":"","affiliations":[],"preferred":false,"id":425939,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Verdin, J. P. 0000-0003-0238-9657","orcid":"https://orcid.org/0000-0003-0238-9657","contributorId":33033,"corporation":false,"usgs":true,"family":"Verdin","given":"J. P.","affiliations":[],"preferred":false,"id":425937,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70031071,"text":"70031071 - 2007 - Deep faulting and structural reactivation beneath the southern Illinois basin","interactions":[],"lastModifiedDate":"2012-03-12T17:21:15","indexId":"70031071","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3112,"text":"Precambrian Research","active":true,"publicationSubtype":{"id":10}},"title":"Deep faulting and structural reactivation beneath the southern Illinois basin","docAbstract":"The investigation of deep fault structure and seismogenesis within \"stable\" continental interiors has been hindered by the paucity of detailed subsurface information and by low levels of seismicity. Outstanding seismotectonic questions for these areas include whether pre-existing structures govern the release of seismic energy as earthquakes, can reactivation of such structures be recognized, and to what extent have Precambrian basement structures exerted long-lived controls on the development of overlying Phanerozoic features. The southern portion of the Illinois basin provides a premier area in which to study the relation between contemporary seismicity and pre-existing structures due to the frequency of seismic events, the concentration of available geophysical data, and the wealth of borehole information. We have integrated the study of this information in order to create a 2.5-dimensional picture of the earth for local seismogenic depths (0-15 km) for a study area of moderate 20th century earthquake activity. The area is located along the western flanks of two of the major structures within the Illinois basin, the Wabash Valley fault system (WVFS) and the La Salle anticlinal belt (LSA). The results of reprocessing seismic reflection profiles, combined with earthquake hypocenter parameters, suggest three distinct seismotectonic environments in the upper crust. First, we have delineated a fault pattern that appears to correspond to the steep nodal plane of a strike-slip mechanism event (1974.04.03; mb = 4.7). The fault pattern is interpreted to be a deeply buried rift zone or zone of intense normal faulting underpinning a major Paleozoic depocenter of the Illinois basin (Fairfield basin). Second, a similar event (1987.06.10; mb = 5.2) and its well-located aftershocks define a narrow zone of deformation that occurs along and parallel to the frontal thrust of the LSA. Third, the hypocenter of the largest event in the study area (1968.11.09; mb = 5.5) may be spatially associated with a prominent zone of dipping middle crustal reflections, just west of the WVFS, which have been interpreted as a deeply buried blind thrust. The proposed correlation of pre-existing structures with earthquakes having consistently oriented structural parameters supports the reactivation of old deformation zones by contemporary stresses as previously proposed by earlier workers. However, the degree to which deformation has propagated upward from Precambrian basement into the Paleozoic rocks varied significantly even over a small study area. The societal value of associating an earthquake with a specific pre-existing deformation zone in the seismogenic crust is to improve the assessment of seismic hazard or to assess the integrity of a stratigraphic formation, being considered as a target for natural gas storage or carbon sequestration. ?? 2007 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Precambrian Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.precamres.2007.02.020","issn":"03019268","usgsCitation":"McBride, J., Leetaru, H., Bauer, R., Tingey, B., and Schmidt, S., 2007, Deep faulting and structural reactivation beneath the southern Illinois basin: Precambrian Research, v. 157, no. 1-4, p. 289-313, https://doi.org/10.1016/j.precamres.2007.02.020.","startPage":"289","endPage":"313","numberOfPages":"25","costCenters":[],"links":[{"id":211540,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.precamres.2007.02.020"},{"id":238842,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"157","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fe24e4b0c8380cd4eb42","contributors":{"authors":[{"text":"McBride, J.H.","contributorId":99712,"corporation":false,"usgs":true,"family":"McBride","given":"J.H.","email":"","affiliations":[],"preferred":false,"id":429912,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Leetaru, H.E.","contributorId":47123,"corporation":false,"usgs":true,"family":"Leetaru","given":"H.E.","email":"","affiliations":[],"preferred":false,"id":429910,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bauer, R.A.","contributorId":102599,"corporation":false,"usgs":true,"family":"Bauer","given":"R.A.","email":"","affiliations":[],"preferred":false,"id":429913,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Tingey, B.E.","contributorId":73397,"corporation":false,"usgs":true,"family":"Tingey","given":"B.E.","email":"","affiliations":[],"preferred":false,"id":429911,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Schmidt, S.E.A.","contributorId":15822,"corporation":false,"usgs":true,"family":"Schmidt","given":"S.E.A.","email":"","affiliations":[],"preferred":false,"id":429909,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70032794,"text":"70032794 - 2007 - Simulation of Intra- or transboundary surface-water-rights hierarchies using the farm process for MODFLOW-2000","interactions":[],"lastModifiedDate":"2018-09-27T11:10:26","indexId":"70032794","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2501,"text":"Journal of Water Resources Planning and Management","active":true,"publicationSubtype":{"id":10}},"title":"Simulation of Intra- or transboundary surface-water-rights hierarchies using the farm process for MODFLOW-2000","docAbstract":"Water-rights driven surface-water allocations for irrigated agriculture can be simulated using the farm process for MODFLOW-2000. This paper describes and develops a model, which simulates routed surface-water deliveries to farms limited by streamflow, equal-appropriation allotments, or a ranked prior-appropriation system. Simulated diversions account for deliveries to all farms along a canal according to their water-rights ranking and for conveyance losses and gains. Simulated minimum streamflow requirements on diversions help guarantee supplies to senior farms located on downstream diverting canals. Prior appropriation can be applied to individual farms or to groups of farms modeled as “virtual farms” representing irrigation districts, irrigated regions in transboundary settings, or natural vegetation habitats. The integrated approach of jointly simulating canal diversions, surface-water deliveries subject to water-rights constraints, and groundwater allocations is verified on numerical experiments based on a realistic, but hypothetical, system of ranked virtual farms. Results are discussed in light of transboundary water appropriation and demonstrate the approach’s suitability for simulating effects of water-rights hierarchies represented by international treaties, interstate stream compacts, intrastate water rights, or ecological requirements.
We argue that the sustainable management of fisheries resources depends on an understanding of the taxonomy and systematics of fish. Toward this end, it is necessary for fisheries managers to understand and apply the various species concepts that have been developed by taxonomists and evolutionary biologists and to decide, based on a philosophical position, what is necessary and sufficient for a taxon to be recognized as a distinct species. If species are viewed as ontological individuals and as such exist in nature, then it makes sense for managers to develop strategies to sustain and manipulate given populations to achieve management goals. In this series of papers, the authors explore species concepts with respect to fish and demonstrate the value of understanding species concepts, systematics, and taxonomy in addressing modern fisheries management problems.
","language":"English","publisher":"Taylor & Francis","doi":"10.1577/T06-166.1","usgsCitation":"Stauffer, J.R., and Kocovsky, P.M., 2007, Exploring links between systematics and fisheries management: Transactions of the American Fisheries Society, v. 136, no. 4, p. 1122-1125, https://doi.org/10.1577/T06-166.1.","productDescription":"4 p.","startPage":"1122","endPage":"1125","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":321722,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"136","issue":"4","noUsgsAuthors":false,"publicationDate":"2011-01-09","publicationStatus":"PW","scienceBaseUri":"57481e30e4b07e28b664dba6","contributors":{"authors":[{"text":"Stauffer, Jay R","contributorId":115581,"corporation":false,"usgs":true,"family":"Stauffer","given":"Jay","email":"","middleInitial":"R","affiliations":[],"preferred":false,"id":630408,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kocovsky, Patrick M. 0000-0003-4325-4265 pkocovsky@usgs.gov","orcid":"https://orcid.org/0000-0003-4325-4265","contributorId":3429,"corporation":false,"usgs":true,"family":"Kocovsky","given":"Patrick","email":"pkocovsky@usgs.gov","middleInitial":"M.","affiliations":[{"id":251,"text":"Ecosystems Mission Area","active":false,"usgs":true},{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"preferred":true,"id":630409,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":74513,"text":"fs20053066 - 2007 - USGS Fire Science: Fire Danger Monitoring and Forecasting","interactions":[],"lastModifiedDate":"2012-03-16T17:16:06","indexId":"fs20053066","displayToPublicDate":"2006-02-19T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2005-3066","title":"USGS Fire Science: Fire Danger Monitoring and Forecasting","docAbstract":"The U.S. Geological Survey (USGS) has advanced the use of moderate-resolution satellite data in a decision support system for assessing national fire potential. Weekly updated digital images of the Normalized Difference Vegetation Index (NDVI), based on data acquired at 1-kilometer (km) resolution (about 0.6 mi), have been used for the past 19 years as a means to assess live vegetation conditions for the purpose of rating fire danger. These images, produced and monitored through the growing season, portray the approximate time of greenup and senescence, as well as the relative amount and condition of growing plants.","language":"ENGLISH","publisher":"Geological Survey (U.S.)","doi":"10.3133/fs20053066","usgsCitation":"Eidenshink, J., 2007, USGS Fire Science: Fire Danger Monitoring and Forecasting: U.S. Geological Survey Fact Sheet 2005-3066, 1 p., https://doi.org/10.3133/fs20053066.","productDescription":"1 p.","numberOfPages":"1","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":122415,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2005_3066.jpg"},{"id":246711,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/fs/2005/3066/","linkFileType":{"id":5,"text":"html"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a29e4b07f02db61194c","contributors":{"authors":[{"text":"Eidenshink, Jeff","contributorId":95156,"corporation":false,"usgs":true,"family":"Eidenshink","given":"Jeff","affiliations":[],"preferred":false,"id":286642,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70198883,"text":"70198883 - 2007 - Modeling low-temperature geochemical processes","interactions":[],"lastModifiedDate":"2018-09-25T11:48:47","indexId":"70198883","displayToPublicDate":"2003-01-01T10:36:43","publicationYear":"2007","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"2","title":"Modeling low-temperature geochemical processes","docAbstract":"No abstract available.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Treatise on geochemistry","language":"English","publisher":"Elsevier","doi":"10.1016/B0-08-043751-6/05074-X","isbn":"9780080437514","usgsCitation":"Nordstrom, D.K., 2007, Modeling low-temperature geochemical processes, chap. 2 of Treatise on geochemistry, v. 5, p. 1-38, https://doi.org/10.1016/B0-08-043751-6/05074-X.","productDescription":"38 p.","startPage":"1","endPage":"38","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"links":[{"id":356700,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5c10dc40e4b034bf6a7fd847","contributors":{"editors":[{"text":"Drever, J.I.","contributorId":58407,"corporation":false,"usgs":true,"family":"Drever","given":"J.I.","affiliations":[],"preferred":false,"id":743259,"contributorType":{"id":2,"text":"Editors"},"rank":1}],"authors":[{"text":"Nordstrom, D. Kirk 0000-0003-3283-5136 dkn@usgs.gov","orcid":"https://orcid.org/0000-0003-3283-5136","contributorId":749,"corporation":false,"usgs":true,"family":"Nordstrom","given":"D.","email":"dkn@usgs.gov","middleInitial":"Kirk","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":false,"id":743258,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70273212,"text":"70273212 - 2006 - Buffelgrass (Pennisetum ciliare) land conversion and productivity in the plains of Sonora, Mexico","interactions":[],"lastModifiedDate":"2025-12-19T15:49:36.177108","indexId":"70273212","displayToPublicDate":"2025-09-19T09:32:51","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1015,"text":"Biological Conservation","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Buffelgrass (Pennisetum ciliare) land conversion and productivity in the plains of Sonora, Mexico","title":"Buffelgrass (Pennisetum ciliare) land conversion and productivity in the plains of Sonora, Mexico","docAbstract":"Bufflelgrass (Pennisetum ciliare syn. Cenchrus ciliaris) is an African grass that has been widely introduced in subtropical arid regions of the world to improve rangelands for cattle production. However, it can have a negative effect on the diversity of native plant communities. Buffelgrass was introduced to Sonora, Mexico in the 1970s as a means to bolster the cattle industry. “Desmonte,” the process by which native desert vegetation is removed in preparation for buffelgrass seeding, alters the land surface such that buffelgrass plots are easily detectable from aerial and Landsat satellite images. We estimated the extent of conversion to buffelgrass in a 1,850,000 ha area centered on Hermosillo, from MSS and TM images from 1973, 1983, 1990 and 2000. We then compared the relative above-ground productivity of buffelgrass to native vegetation using Normalized Difference Vegetation Index values (NDVI) from Landsat and Moderate Resolution Imaging Spectrometer (MODIS) satellite sensor systems. Buffelgrass pastures have increased from just 7700 ha in 1973 to over 140,000 ha in 2000. Buffelgrass pastures now cover 8% of the land surface in the study area. Buffelgrass pastures have lower net primary productivity, estimated by MODIS NDVI values, than unconverted desert land. The desmonte process removes trees and shrubs, while the buffelgrass plantings are often sparse, leading to an apparent net loss in net primary production from land conversion. We recommend that the desmonte process be discontinued until its efficacy and safety for native ecosystems can be established, and that a comprehensive plan for preserving biodiversity while accomodating economic development be established for this region of the Sonoran Desert in Mexico.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.biocon.2005.07.018","usgsCitation":"Franklin, K.A., Lyons, K., Nagler, P.L., Lampkin, D., Glenn, E.P., Molina-Freaner, F., Markow, T., and Huete, A.R., 2006, Buffelgrass (Pennisetum ciliare) land conversion and productivity in the plains of Sonora, Mexico: Biological Conservation, v. 127, no. 1, p. 62-71, https://doi.org/10.1016/j.biocon.2005.07.018.","productDescription":"10 p.","startPage":"62","endPage":"71","costCenters":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"links":[{"id":497769,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Mexico","state":"Sonora","otherGeospatial":"Plains of Sonora","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -111.34259567104225,\n 30.555012631219427\n ],\n [\n -112.81806608880689,\n 29.880271513235172\n ],\n [\n -110.41803141575451,\n 27.204194529819702\n ],\n [\n -109.20603785830497,\n 28.13332597337235\n ],\n [\n -111.34259567104225,\n 30.555012631219427\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"127","issue":"1","noUsgsAuthors":false,"publicationDate":"2005-09-19","publicationStatus":"PW","contributors":{"authors":[{"text":"Franklin, Kim A.","contributorId":279983,"corporation":false,"usgs":false,"family":"Franklin","given":"Kim","email":"","middleInitial":"A.","affiliations":[{"id":57402,"text":"Arizona-Sonora Desert Museum","active":true,"usgs":false}],"preferred":false,"id":952716,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lyons, Kelly","contributorId":364475,"corporation":false,"usgs":false,"family":"Lyons","given":"Kelly","affiliations":[],"preferred":false,"id":952717,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Nagler, Pamela L. 0000-0003-0674-103X pnagler@usgs.gov","orcid":"https://orcid.org/0000-0003-0674-103X","contributorId":1398,"corporation":false,"usgs":true,"family":"Nagler","given":"Pamela","email":"pnagler@usgs.gov","middleInitial":"L.","affiliations":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"preferred":true,"id":952718,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Lampkin, Derrick","contributorId":364476,"corporation":false,"usgs":false,"family":"Lampkin","given":"Derrick","affiliations":[],"preferred":false,"id":952719,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Glenn, Edward P.","contributorId":19289,"corporation":false,"usgs":true,"family":"Glenn","given":"Edward","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":952720,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Molina-Freaner, Francisco","contributorId":364477,"corporation":false,"usgs":false,"family":"Molina-Freaner","given":"Francisco","affiliations":[],"preferred":false,"id":952721,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Markow, Therese","contributorId":364478,"corporation":false,"usgs":false,"family":"Markow","given":"Therese","affiliations":[],"preferred":false,"id":952722,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Huete, Alfredo R","contributorId":243589,"corporation":false,"usgs":false,"family":"Huete","given":"Alfredo","email":"","middleInitial":"R","affiliations":[{"id":48742,"text":"School of Life Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia","active":true,"usgs":false}],"preferred":false,"id":952723,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":72263,"text":"ofr20051247 - 2006 - Relative Coastal Change-Potential Assessment of Glacier Bay National Park and Preserve","interactions":[],"lastModifiedDate":"2021-03-31T12:09:22.507404","indexId":"ofr20051247","displayToPublicDate":"2021-03-30T10:15:00","publicationYear":"2006","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2005-1247","displayTitle":"Relative Coastal Change-Potential Assessment of Glacier Bay National Park and Preserve","title":"Relative Coastal Change-Potential Assessment of Glacier Bay National Park and Preserve","docAbstract":"A change-potential index (CPI) was used to map the relative coastal change-potential of the shoreline to future sea-level fluctuation within Glacier Bay National Park and Preserve (GBNPP) in southeastern Alaska. The CPI ranks the following in terms of their physical contribution to coastal change: geomorphology, regional coastal slope, rate of relative sea-level change, historical shoreline change rates, mean tidal range and mean significant wave height. The rankings for each input variable were combined, and an index value calculated for 1-minute grid cells covering the park. The CPI highlights those regions where the physical effects of sea-level and coastal change might be the greatest. This approach combines the coastal system's potential for change with its natural ability to adapt to changing environmental conditions, yielding a quantitative, although relative, measure of the park's natural susceptibility to the effects of sea-level variation. The CPI provides an objective method for evaluation and long-term planning by scientists and park managers. The CPI was developed from a Coastal Vulnerability Index (CVI) typically applied to coastlines experiencing long-term sea-level rise. 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384 Woods Hole Road
Woods Hole, MA 02543
A change-potential index (CPI) was used to map the relative coastal change-potential of the shoreline to future sea-level changes within Kenai Fjords National Park (KEFJ) in south-central Alaska. The CPI ranks the following parameters in terms of their physical contribution to coastal change: geomorphology, regional coastal slope, rate of relative sea-level change, historical shoreline change rates, mean tidal range, and mean significant wave height. The rankings for each input variable were combined, and an index value was calculated for 1-minute grid cells covering the park. The CPI highlights those regions where the physical effects of sea-level and coastal changes might be the greatest. This multi-parametric approach combines the coastal system's potential for change with its natural ability to adapt to changing environmental conditions, yielding a quantitative, although relative, measure of the park's natural susceptibility to the effects of sea-level variation. The CPI provides an objective technique for evaluation and long-term planning by scientists and park managers. The CPI was developed from a Coastal Vulnerability Index (CVI) typically applied to coastlines undergoing long-term sea-level rise. The CPI is modified from the CVI and applied to the emergent coast of Kenai Fjords National Park to understand the limits of applying this type of assessment method in a variety of sea-level settings. Kenai Fjords National Park consists of sand and gravel beaches, rock cliffs, calving tidewater glaciers, mudflats, and alluvial fans. The areas within Kenai Fjords National Park that are likely to be most susceptible to coastal change as a result of sea-level change are tidewater glaciers and outer coast shorelines of unconsolidated sediment where shoreline erosion potential is high and wave energy is high.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20041373","collaboration":"Prepared in cooperation with the National Park Service","usgsCitation":"Pendleton, E., Thieler, E.R., and Williams, S.J., 2006, Relative coastal change-potential assessment of Kenai Fjords National Park: U.S. Geological Survey Open-File Report 2004-1373, 30 p., https://doi.org/10.3133/ofr20041373.","productDescription":"30 p.","numberOfPages":"30","onlineOnly":"Y","additionalOnlineFiles":"N","costCenters":[{"id":680,"text":"Woods Hole Science Center","active":false,"usgs":true}],"links":[{"id":384674,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2004/1373/ofr20041373.pdf","text":"Report","size":"1.61 MB","linkFileType":{"id":1,"text":"pdf"},"description":"OFR 2004-1373"},{"id":8051,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/2004/1373/","linkFileType":{"id":5,"text":"html"}},{"id":194725,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/2004/1373/coverthb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Kenai Fjords National Park","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -149.4744873046875,\n 59.97425688709357\n ],\n [\n -149.7491455078125,\n 60.29429873400916\n ],\n [\n -150.22705078124997,\n 60.16064293693041\n ],\n [\n -150.545654296875,\n 59.88066847319146\n ],\n [\n -150.963134765625,\n 59.66219187669592\n ],\n [\n -151.10046386718747,\n 59.358395906039405\n ],\n [\n -150.919189453125,\n 59.2771080105117\n ],\n [\n -150.0018310546875,\n 59.65109171169264\n ],\n [\n -149.46350097656247,\n 59.9632601849119\n ],\n [\n -149.4744873046875,\n 59.97425688709357\n ]\n ]\n ]\n }\n }\n ]\n}","contact":"Director, Woods Hole Coastal and Marine Science Center
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