Magnetic properties in an ash flow tuff with continuous grain size variation: a natural reference for magnetic particle granulometry
J.L. Till, M.J. Jackson, J. G. Rosenbaum, P. Solheid
2011, Geochemistry, Geophysics, Geosystems (12)
The Tiva Canyon Tuff contains dispersed nanoscale Fe-Ti-oxide grains with a narrow magnetic grain size distribution, making it an ideal material in which to identify and study grain-size-sensitive magnetic behavior in rocks. A detailed magnetic characterization was performed on samples from the basal 5 m of the tuff. The magnetic...
V is for verde antique
W. H. Langer
2011, Aggregates Manager (16) 44-44
Geomorphic floodplain with organic matter (biomass) estimates for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the geomorphic floodplain as derived...
Active channel for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the active, wetted channel as...
Mineral resource of the month: titanium
Joseph Gambogi
2011, Earth (2011) 19-19
Titanium is hip - at least when it comes to airplanes and jewelry. Known for its high strength-to weight ratio and its resistance to corrosion, titanium and its alloys can also be found in everything from knee replacements to eyeglass frames to baseball bats to fighter planes....
Distribution and characterization of in-channel large wood in relation to geomorphic patterns on a low-gradient river
Bertrand Moulin, Edward R. Schenk, Cliff R. Hupp
2011, Earth Surface Processes and Landforms (36) 1137-1151
A 177 river km georeferenced aerial survey of in-channel large wood (LW) on the lower Roanoke River, NC was conducted to determine LW dynamics and distributions on an eastern USA low-gradient large river. Results indicate a system with approximately 75% of the LW available for transport either as detached individual...
U.S. Geological Survey: A synopsis of Three-dimensional Modeling
Linda J. Jacobsen, Pierre D. Glynn, Geoff A. Phelps, Randall C. Orndorff, Gerald W. Bawden, V. J. S. Grauch
2011, Book chapter, Chapter 13 in <i>Synopsis of Current Three-dimensional Geological Mapping and Modeling in Geological Survey Organizations</i>
The U.S. Geological Survey (USGS) is a multidisciplinary agency that provides assessments of natural resources (geological, hydrological, biological), the disturbances that affect those resources, and the disturbances that affect the built environment, natural landscapes, and human society. Until now, USGS map products have been generated and distributed primarily as 2-D...
Estimating temporal trend in the presence of spatial complexity: A Bayesian hierarchical model for a wetland plant population undergoing restoration
T.J. Rodhouse, K.M. Irvine, K.T. Vierling, L.A. Vierling
2011, PLoS ONE (6)
Monitoring programs that evaluate restoration and inform adaptive management are important for addressing environmental degradation. These efforts may be well served by spatially explicit hierarchical approaches to modeling because of unavoidable spatial structure inherited from past land use patterns and other factors. We developed Bayesian hierarchical models to estimate trends...
Duration and severity of Medieval drought in the Lake Tahoe Basin
J.A. Kleppe, D.S. Brothers, G.M. Kent, F. Biondi, S. Jensen, N. W. Driscoll
2011, Quaternary Science Reviews (30) 3269-3279
Droughts in the western U.S. in the past 200 years are small compared to several megadroughts that occurred during Medieval times. We reconstruct duration and magnitude of extreme droughts in the northern Sierra Nevada from hydroclimatic conditions in Fallen Leaf Lake, California. Stands of submerged trees rooted in situ below...
Investigating the spatial distribution of water levels in the Mackenzie Delta using airborne LiDAR
C. Hopkinson, N. Crasto, P. Marsh, D. Forbes, L. Lesack
2011, Hydrological Processes (25) 2995-3011
Airborne light detection and ranging (LiDAR) data were used to map water level (WL) and hydraulic gradients (δH/δx) in the Mackenzie Delta. The LiDAR WL data were validated against eight independent hydrometric gauge measurements and demonstrated mean offsets from − 0·22 to + 0·04 m (σ< 0·11). LiDAR‐based WL gradients...
Soils and late-Quaternary landscape evolution in the Cottonwood River basin, east-central Kansas: Implications for archaeological research
J.M. Beeton, R.D. Mandel
2011, Geoarchaeology (26) 693-723
Temporal and spatial patterns of landscape evolution strongly influence the temporal and spatial patterns of the archaeological record in drainage systems. In this geoarchaeological investigation we took a basin‐wide approach in assessing the soil stratigraphy, lithostratigraphy, and geochronology of alluvial deposits and associated buried soils in the Cottonwood River basin...
Sparrow modeling to understand water-quality conditions in major regions of the United States: A featured collection introduction
S. D. Preston, R. B. Alexander, D.M. Wolock
2011, Journal of the American Water Resources Association (47) 887-890
No abstract available....
An acarologic survey and Amblyomma americanum distribution map with implications for tularemia risk in Missouri
H.E. Brown, K.F. Yates, G. Dietrich, K. MacMillan, C.B. Graham, S.M. Reese, Wm. S. Helterbrand, W.L. Nicholson, K. Blount, P.S. Mead, S.L. Patrick, R.J. Eisen
2011, American Journal of Tropical Medicine and Hygiene (84) 411-419
In the United States, tickborne diseases occur focally. Missouri represents a major focus of several tickborne diseases that includes spotted fever rickettsiosis, tularemia, and ehrlichiosis. Our study sought to determine the potential risk of human exposure to human-biting vector ticks in this area. We collected ticks in 79 sites in...
The Regionalization of National-Scale SPARROW Models for Stream Nutrients
Gregory E. Schwarz, Richard B. Alexander, Richard A. Smith, Stephen D. Preston
2011, Journal of the American Water Resources Association (47) 1151-1172
This analysis modifies the parsimonious specification of recently published total nitrogen (TN) and total phosphorus (TP) national‐scale SPAtially Referenced Regressions On Watershed attributes models to allow each model coefficient to vary geographically among three major river basins of the conterminous United States. Regionalization of the national models reduces the standard...
Nutrient loadings to streams of the Continental United States from municipal and industrial effluent
M.A. Maupin, T. Ivahnenko
2011, Journal of the American Water Resources Association (47) 950-964
Data from the United States Environmental Protection Agency Permit Compliance System national database were used to calculate annual total nitrogen (TN) and total phosphorus (TP) loads to surface waters from municipal and industrial facilities in six major regions of the United States for 1992, 1997, and 2002. Concentration and effluent...
Cumulative effects of restoration efforts on ecological characteristics of an open water area within the Upper Mississippi River
B. R. Gray, W. Shi, J.N. Houser, J. T. Rogala, Z. Guan, J. L. Cochran-Biederman
2011, River Research and Applications (27) 537-549
Ecological restoration efforts in large rivers generally aim to ameliorate ecological effects associated with large-scale modification of those rivers. This study examined whether the effects of restoration efforts-specifically those of island construction-within a largely open water restoration area of the Upper Mississippi River (UMR) might be seen at the spatial...
Water and heat transport in boreal soils: Implications for soil response to climate change
Z. Fan, J. C. Neff, J.W. Harden, T. Zhang, H. Veldhuis, C.I. Czimczik, G.C. Winston, J. A. O'Donnell
2011, Science of the Total Environment (409) 1836-1842
Soil water content strongly affects permafrost dynamics by changing the soil thermal properties. However, the movement of liquid water, which plays an important role in the heat transport of temperate soils, has been under-represented in boreal studies. Two different heat transport models with and without convective heat transport were compared...
Modeling hydrologic and geomorphic hazards across post-fire landscapes using a self-organizing map approach
Michael J. Friedel
2011, Environmental Modelling and Software (26) 1660-1674
Few studies attempt to model the range of possible post-fire hydrologic and geomorphic hazards because of the sparseness of data and the coupled, nonlinear, spatial, and temporal relationships among landscape variables. In this study, a type of unsupervised artificial neural network, called a self-organized map (SOM), is trained using data...
Seismic hazard assessment: Issues and alternatives
Z. Wang
2011, Pure and Applied Geophysics (168) 11-25
Seismic hazard and risk are two very important concepts in engineering design and other policy considerations. Although seismic hazard and risk have often been used inter-changeably, they are fundamentally different. Furthermore, seismic risk is more important in engineering design and other policy considerations. Seismic hazard assessment is an effort by...
Ascent of neotropical migratory fish in the Itaipu Reservoir fish pass
S. Makrakis, L.E. Miranda, L.C. Gomes, M.C. Makrakis, H.M.F. Junior
2011, River Research and Applications (27) 511-519
The Piracema Canal is a complex 10-km fish pass system that climbs 120m to connect the Paran?? River to the Itaipu Reservoir along the Brazil-Paraguay border. The canal was constructed to allow migratory fishes to reach suitable habitats for reproduction and feeding in tributaries upstream from the reservoir. The Piracema...
Recent faulting in western Nevada revealed by multi-scale seismic reflection
R.N. Frary, J.N. Louie, W. J. Stephenson, J. K. Odum, A. Kell, A. Eisses, G.M. Kent, N. W. Driscoll, R. Karlin, R. L. Baskin, S. Pullammanappallil, L.M. Liberty
2011, SEG Technical Program Expanded Abstracts (30) 1373-1377
The main goal of this study is to compare different reflection methods used to image subsurface structure within different physical environments in western Nevada. With all the methods employed, the primary goal is fault imaging for structural information toward geothermal exploration and seismic hazard estimation. We use seismic CHIRP a...
New insights from well responses to fluctuations in barometric pressure
J.J. Butler, W. Jin, G.A. Mohammed, E.C. Reboulet
2011, Ground Water (49) 525-533
Hydrologists have long recognized that changes in barometric pressure can produce changes in water levels in wells. The barometric response function (BRF) has proven to be an effective means to characterize this relationship; we show here how it can also be utilized to glean valuable insights into semi-confined aquifer systems....
Evaluation of Nobuto filter paper strips for the detection of avian influenza virus antibody in waterfowl
Robert J. Dusek, Jeffrey S. Hall, Sean W. Nashold, Joshua L. Teslaa, Hon S. Ip
2011, Avian Diseases (55) 674-676
The utility of using Nobuto paper strips for the detection of avian influenza antibodies was examined in mallards (Anas platyrhynchos) experimentally infected with low pathogenic avian influenza viruses. Blood was collected 2 wk after infection and was preserved either as serum or whole blood absorbed onto Nobuto strips. Analysis of...
Methodology to assess water presence on speleothems during periods of low precipitation, with implications for recharge sources - Kartchner Caverns, Arizona
Kyle W. Blasch
2011, Journal of Cave and Karst Studies (73) 63-74
Beginning in January 2005, recharge processes and the presence of water on speleothems were monitored in Kartchner Caverns during a 44-month period when annual rainfall rates were 6 to 18 percent below the long-term mean. Electrical-resistance sensors designed to detect the presence of water were used to identify ephemeral streamflow...
Transfer and transformation of soil iron and implications for hydrogeomorpholocial changes in Naoli River catchment, sanjiang plain, Northeast China
J. Ming, L. Xianguo, W. Hongqing, Z. Yuanchun, W. Haitao
2011, Chinese Geographical Science (21) 149-158
Wetland soils are characterized by alternating redox process due to the fluctuation of waterlogged conditions. Iron is an important redox substance, and its transfer and transformation in the wetland ecosystem could be an effective indicator for the environment changes. In this paper, we selected the Naoli River catchment in the...
