Remote mineralogic and lithologic mapping of the Ice River alkaline complex, British Columbia, Canada, using AVIRIS data
T. L. Bowers, L. C. Rowan
1996, Photogrammetric Engineering and Remote Sensing (62) 1379-1385
The Ice River Alkaline Complex is a late Paleozoic intrusion of mafic alkaline rocks, syenite, and carbonatite exposed in southeastern British Columbia, Canada. The complex intrudes Cambrian and Ordovician shales, slates, and limestones of the Chancellor and Ottertail Formations and the McKay Group. We examined the alkaline complex and adjacent...
Differentiation and magma mixing on Kilauea's east rift zone: A further look at the eruptions of 1955 and 1960. Part II. The 1960 lavas
T. L. Wright, Rosalind Tuthill Helz
1996, Bulletin of Volcanology (57) 602-630
New and detailed petrographic observations, mineral compositional data, and whole-rock vs glass compositional trends document magma mixing in lavas erupted from Kilauea's lower east rift zone in 1960. Evidence includes the occurrence of heterogeneous phenocryst assemblages, including resorbed and reversely zoned minerals in the lavas inferred to be hybrids. Calculations...
A precise vertical network: Establishing new orthometric heights with static surveys in Florida tidal marshes
E. A. Raabe, R. P. Stumpf, N.J. Marth, R.L. Shrestha
1996, Surveying and Land Information Systems (56) 200-211
Elevation differences on the order of 10 cm within Florida's marsh system influence major variations in tidal flooding and in the associated plant communities. This low elevation gradient combined with sea level fluctuation of 5-to-10 cm over decadel and longer periods can generate significant alteration and erosion of marsh habitats...
Using remote sensing and GIS techniques to estimate discharge and recharge fluxes for the Death Valley regional groundwater flow system, USA
F. A. D’Agnese, C.C. Faunt, A. K. Turner
Kovar K.Nachtnebel H.P., editor(s)
1996, Application of geographic information systems in hydrology and water resources management. Proc. HydroGIS'96 conference, Vienna, 1996 503-511
The recharge and discharge components of the Death Valley regional groundwater flow system were defined by techniques that integrated disparate data types to develop a spatially complex representation of near-surface hydrological processes. Image classification methods were applied to multispectral satellite data to produce a vegetation map. The vegetation map was...
Aeromagnetic survey over US to advance geomagnetic research
T.G. Hildenbrand, R.J. Blakely, W. J. Hinze, Gordon R. Keller, R.A. Langel, M. Nabighian, W. Roest
1996, Eos, Transactions, American Geophysical Union (77) 265-268
A proposed high-altitude survey of the United States offers an exciting and cost effective opportunity to collect magnetic-anomaly data. Lockheed Martin Missile and Space Company is considering funding a reimbursable ER-2 aircraft (Figure 1) mission to collect synthetic aperture radar (SAR) imagery at an altitude of...
Use of 2D and 3D GIS in well selection and interpretation of nitrate data, central Nebraska, USA
Ingrid M. Verstraeten, V. L. McGuire, W.A. Battaglin
Kovar K.Nachtnebel H.P., editor(s)
1996, Application of geographic information systems in hydrology and water resources management. Proc. HydroGIS'96 conference, Vienna, 1996 585-591
Nonpoint-source contamination of the principal aquifers in an area of central Nebraska was evaluated utilizing aquifer condition, well depth, soil type, and physiographical and land use settings. A two-dimensional geographical information system linked with a three-dimensional geological visualization and analytical program was used in the random selection of acceptable wells...
Open-ocean boundary conditions from interior data: Local and remote forcing of Massachusetts Bay
P.S. Bogden, P. Malanotte-Rizzoli, R. Signell
1996, Journal of Geophysical Research C: Oceans (101) 6487-6500
Massachusetts and Cape Cod Bays form a semienclosed coastal basin that opens onto the much larger Gulf of Maine. Subtidal circulation in the bay is driven by local winds and remotely driven flows from the gulf. The local-wind forced flow is estimated with a regional shallow water model driven by...
Outburst floods from glacier-dammed lakes: The effect of mode of lake drainage on flood magnitude
Joseph S. Walder, John E. Costa
1996, Earth Surface Processes and Landforms (21) 701-723
Published accounts of outburst floods from glacier‐dammed lakes show that a significant number of such floods are associated not with drainage through a tunnel incised into the basal ice—the process generally assumed—but rather with ice‐marginal drainage, mechanical failure of part of the ice dam, or both. Non‐tunnel floods are strongly correlated with...
Factors leading to different viability predictions for a grizzly bear data set
L. S. Mills, S.G. Hayes, M.J. Wisdom, J. Citta, D.J. Mattson, K. Murphy
1996, Conservation Biology (10) 863-873
Population viability analysis programs are being used increasingly in research and management applications, but there has not been a systematic study of the congruence of different program predictions based on a single data set. We performed such an analysis using four population viability analysis computer programs: GAPPS, INMAT, RAMAS/AGE, and...
The 1993 Mississippi river flood: A one hundred or a one thousand year event?
B.D. Malamud, D.L. Turcotte, C.C. Barton
1996, Environmental & Engineering Geoscience (2) 479-486
Power-law (fractal) extreme-value statistics are applicable to many natural phenomena under a wide variety of circumstances. Data from a hydrologic station in Keokuk, Iowa, shows the great flood of the Mississippi River in 1993 has a recurrence interval on the order of 100 years using power-law statistics applied to partial-duration...
Relation of landscape position and irrigation to concentrations of alachlor, atrazine, and selected degradates in regolith in northeastern Nebraska
Ingrid M. Verstraeten, D. T. Lewis, D. L. McCallister, A. Parkhurst, E.M. Thurman
1996, ACS Symposium Series (630) 178-197
Concentrations of alachlor, its ethanesulfonic acid degradate, atrazine and its degradates, deethylatrazine and deisopropylatrazine, in the upper regolith and associated shallow aquifers were determined in relation to landscape position (floodplains, terraces, and uplands) and irrigation (nonirrigated and irrigated corn cropland) in 1992. Irrigated and nonirrigated sites were located on each...
Bacteriological quality of ground water used for household supply, Lower Susquehanna River basin, Pennsylvania and Maryland
Tammy M. Bickford, Bruce D. Lindsey, M.R. Beaver
1996, Water-Resources Investigations Report 96-4212
This report describes the bacteriological results of a ground-water study conducted from 1993 to 1995 as part of the U.S. Geological Survey's National Water-Quality Assessment Program in the Lower Susquehanna River Basin study unit. Water samples collected from 146 household supply wells were analyzed for fecal-indicator organisms including total coliform,...
Effects of cavity-entrance restrictors on red-cockaded woodpeckers
B.E. Raulston, D.A. James, J.E. Johnson
1996, Wildlife Society Bulletin (24) 694-698
The U.S. Forest Service has installed restrictors on cavity entrances of red-cockaded woodpeckers to limit access by larger cavity-dwelling competitors. This study tested the hypothesis that restrictors have no adverse effects on red-cockaded woodpeckers. Entrance restrictors were placed on openings to 20 cavities used by roosting red-cockaded woodpeckers, and 20...
Geometry of the 1954 Fairview Peak-Dixie Valley earthquake sequence from a joint inversion of leveling and triangulation data
K.M. Hodgkinson, R.S. Stein, G. Marshall
1996, Journal of Geophysical Research B: Solid Earth (101) 25437-25457
In 1954, four earthquakes greater than Ms = 6.0 occurred within a 30-km radius and in a period of 6 months. Elevation and angle changes calculated from repeated leveling and triangulation surveys which span the coseismic period provide constraints on the fault geometries and coseismic slip of the faults which were activated....
Water resources of Lincoln County, Wyoming
C. A. Eddy-Miller, Maria Plafcan, M. L. Clark
1996, Water-Resources Investigations Report 96-4246
Streamflow and ground-water quantity and quality data were collected and analyzed, 1993 through 1995, and historical data were compiled to summarize the water resources of Lincoln County.Deposits of Quaternary age, in the valleys of the Bear River and Salt River, had the most well development of...
Factors affecting herbicide yields in the Chesapeake Bay watershed, June 1994
R.A. Hainly, J.M. Kahn
1996, Water Resources Bulletin (32) 965-984
Median concentrations and instantaneous yields of alachlor, metolachlor, atrazine, cyanazine, and simazine were generally highest at sites in the Lower Susquehanna River Basin and in agricultural subbasins. Instantaneous herbicide yields are related to land use, hydrogeologic setting, streamflow yield, and agricultural row cropping practices. The significance of these relations may...
Using remote sensing and GIS techniques to estimate discharge and recharge. fluxes for the Death Valley regional groundwater flow system, USA
F. A. D’Agnese, C.C. Faunt, Turner A. Keith
1996, IAHS-AISH Publication 503-511
The recharge and discharge components of the Death Valley regional groundwater flow system were defined by remote sensing and GIS techniques that integrated disparate data types to develop a spatially complex representation of near-surface hydrological processes. Image classification methods were applied to multispectral satellite data to produce a vegetation map....
Sediment inflow to the delta from the Sacramento and San Joaquin Rivers
R.N. Oltmann
1996, Interagency Ecological Program Newsletter (9) 22-23
USGS routinely measures the daily suspended sediment load entering the delta with the flows of the Sacramento and San Joaquin rivers. Most of the suspended sediment that flows into the delta is carried by these two rivers, but it also enters from Yolo Bypass; the Mokelumne, Calaveras, and Cosumnes rivers;...
Development of a 10-year limnological study of Crater Lake, Crater Lake National Park, Oregon, USA
Gary L. Larson
1996, Journal of Lake and Reservoir Management (12) 221-229
This paper summarizes the development of a limnological study of Crater Lake conducted between 1983 and 1992. The program was mandated by Congress in the fall of 1982 after a panel of limnologists found the lake data base (1896–1981) to be inadequate to determine if the phytoplankton community had changed...
Phylogenetic relationships within the Alcidae (Charadriiformes: Aves) inferred from total molecular evidence
Vicki L. Friesen, Allan J. Baker, John F. Piatt
1996, Molecular Biology and Evolution (13) 359-367
The Alcidae is a unique assemblage of Northern Hemisphere seabirds that forage by "flying" underwater. Despite obvious affinities among the species, their evolutionary relationships are unclear. We analyzed nucleotide sequences of 1,045 base pairs of the mitochondrial cytochrome b gene and allelic profiles for 37 allozyme loci in all 22...
An approach for using AVHRR data to monitor U.S. great plains grasslands
B. C. Reed, Thomas R. Loveland, L.L. Tieszen
1996, Geocarto International (11) 13-22
Environmental monitoring requires regular observations regarding the status of the landscape- The concept behind most monitoring efforts using satellite data involve deriving normalized difference vegetation index (NDVI) values or accumulating the NDVI over a specified time period. These efforts attempt to estimate the continuous growth of green biomass by using...
Maximum likelihood estimation for the double-count method with independent observers
Bryan F.J. Manly, Lyman L. McDonald, Gerald W. Garner
1996, Journal of Agricultural, Biological, and Environmental Statistics (1) 170-189
Data collected under a double-count protocol during line transect surveys were analyzed using new maximum likelihood methods combined with Akaike's information criterion to provide estimates of the abundance of polar bear (Ursus maritimus Phipps) in a pilot study off the coast of Alaska. Visibility biases were corrected by modeling the...
Geomagnetic storms, the Dst ring-current myth and lognormal distributions
W.H. Campbell
1996, Journal of Atmospheric and Terrestrial Physics (58) 1171-1187
The definition of geomagnetic storms dates back to the turn of the century when researchers recognized the unique shape of the H-component field change upon averaging storms recorded at low latitude observatories. A generally accepted modeling of the storm field sources as a magnetospheric ring current was settled about 30...
Regionalization of annual precipitation maxima in Montana
Charles Parrett
Housner G.W.Chung R.M., editor(s)
1996, Conference Paper, Proceedings of the Conference on Natural Disaster Reduction
Precipitation depth estimation methods based on dimensionless precipitation-frequency curves were developed for 2-, 6-,and 24-hour storm durations for three homogeneous regions in Montana. Data from 402 daily and hourly precipitation stations and 54 daily precipitation stations were analyzed using the methods to form a database of the regions' annual precipitation...
A preliminary evaluation of sediment quality assessment values for freshwater ecosystems
Sherri L. Smith, Donald D. MacDonald, Karen A. Keenleyside, Christopher G. Ingersoll, L. Jay Field
1996, Journal of Great Lakes Research (22) 624-638
Sediment quality assessment values were developed using a weight of evidence approach in which matching biological and chemical data from numerous modelling, laboratory, and field studies performed on freshwater sediments were compiled and analyzed. Two assessment values (a threshold effect level (TEL) and a probable effect level(PEL)) were derived for...
