Conference Papers
Science Quality and Integrity
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Characterization of seepage in the exploratory studies facility, Yucca Mountain, Nevada
Following a 5-month period of above-average precipitation during the winter of 2004-2005, water was observed seeping into the South Ramp section of the Exploratory Studies Facility of the proposed repository for high-level radioactive waste at Yucca Mountain, Nevada. Samples of the seepage were collected and analyzed for major ions, trace metals, and delta deuterium and delta oxygen-18 values in a
Authors
T.A. Oliver, J. F. Whelan
Characterizing the role benthos plays in large coastal seas and estuaries: A modular approach
Ecologists studying coastal and estuarine benthic communities have long taken a macroecological view, by relating benthic community patterns to environmental factors across several spatial scales. Although many general ecological patterns have been established, often a significant amount of the spatial and temporal variation in soft-sediment communities within and among systems remains unexplained
Authors
K.R. Tenore, R.N. Zajac, J. Terwin, F. Andrade, J. Blanton, W. Boynton, D. Carey, R. Diaz, Austin F. Holland, E. Lopez-Jamar, P. Montagna, F. Nichols, R. Rosenberg, H. Queiroga, M. Sprung, R.B. Whitlatch
Chlorine toxicity to early life stages of freshwater mussels (Bivalvia: Unionidae)
Chlorine (Cl) is a highly toxic, widely used halogen disinfectant that is present in point-source pollution discharges from wastewater treatment plants and industrial facilities. The U.S. Environmental Protection Agency freshwater criteria for Cl are 19 ??g total residual Cl (TRC)/L as a maximum 1-h average concentration and 11 ??g TRC/L as a maximum 4-d average; however, toxicological data for un
Authors
T.W. Valenti, D.S. Cherry, R.J. Currie, R. J. Neves, J. W. Jones, R. Mair, C.M. Kane
Comparison of local grid refinement methods for MODFLOW
Many ground water modeling efforts use a finite-difference method to solve the ground water flow equation, and many of these models require a relatively fine-grid discretization to accurately represent the selected process in limited areas of interest. Use of a fine grid over the entire domain can be computationally prohibitive; using a variably spaced grid can lead to cells with a large aspect ra
Authors
S. Mehl, M. C. Hill, S. A. Leake
Containing arsenic-enriched groundwater tracing lead isotopic compositions of common arsenical pesticides in a coastal Maine watershed
Arsenical pesticides and herbicides were extensively used on apple, blueberry, and potato crops in New England during the first half of the twentieth century. Lead arsenate was the most heavily used arsenical pesticide until it was officially banned. Lead arsenate, calcium arsenate, and sodium arsenate have similar Pb isotope compositions: 208Pb207Pb = 2.3839-2.4722, and 206Pb207Pb = 1.1035-1.2010
Authors
Robert A. Ayuso, Nora K. Foley, Glipin R. Robinson, A.S. Colvin, G. Lipfert, A.S. Reeve
Contamination of ground water by PCE - A national perspective
Perchloroethylene (PCE) has physical and chemical properties that make it likely to persist in groundwater if released to the environment. The US Geological Survey has collected or compiled data on the occurrence of PCE in groundwater from major aquifers around the US. These data represent the occurrence of PCE in the groundwater resource as a whole and not occurrence at specific release sites. PC
Authors
M.J. Moran, G.C. Delzer
Cross-calibration of A.M. constellation sensors for long term monitoring of land surface processes
Data from multiple sensors must be used together to gain a more complete understanding of land surface processes at a variety of scales. Although higher-level products derived from different sensors (e.g., vegetation cover, albedo, surface temperature) can be validated independently, the degree to which these sensors and their products can be compared to one another is vastly improved if their rel
Authors
D. Meyer, G. Chander
Cross-calibration of MODIS with ETM+ and ALI sensors for long-term monitoring of land surface processes
Increasingly, data from multiple sensors are used to gain a more complete understanding of land surface processes at a variety of scales. Although higher-level products (e.g., vegetation cover, albedo, surface temperature) derived from different sensors can be validated independently, the degree to which these sensors and their products can be compared to one another is vastly improved if their re
Authors
D. Meyer, G. Chander
Cross-calibration of the Landsat-7 ETM+ and Landsat-5 TM with the ResourceSat-1 (IRS-P6) AWiFS and LISS-III sensors
Increasingly, data from multiple sensors are used to gain a more complete understanding of land surface processes at a variety of scales. The Landsat suite of satellites has collected the longest continuous archive of multispectral data. The ResourceSat-1 Satellite (also called as IRS-P6) was launched into the polar sunsynchronous orbit on Oct 17, 2003. It carries three remote sensing sensors: the
Authors
G. Chander, P. L. Scaramuzza
Degradation of water quality by bird feces in and around managed wetlands
No abstract available.
Authors
G.G. Shellenbarger, A.B. Boehm
Description of the L1C signal
Detailed design of the modernized LI civil signal (L1C) signal has been completed, and the resulting draft Interface Specification IS-GPS-800 was released in Spring 2006. The novel characteristics of the optimized L1C signal design provide advanced capabilities while offering to receiver designers considerable flexibility in how to use these capabilities. L1C provides a number of advanced features
Authors
J.W. Betz, M.A. Blanco, C.R. Cahn, P.A. Dafesh, C.J. Hegarty, K.W. Hudnut, V. Kasemsri, R. Keegan, K. Kovach, L.S. Lenahan, H.H. Ma, J.J. Rushanan, D. Sklar, T.A. Stansell, C.C. Wang, S.K. Yi
Determination of coalbed methane potential and gas adsorption capacity in Western Kentucky coals
The Illinois Basin has not been developed for Coalbed Methane (CBM) production. It is imperative to determine both gas content and other parameters for the Kentucky portion of the Illinois Basin if exploration is to progress and production is to occur in this area. This research is part of a larger project being conducted by the Kentucky Geological Survey to evaluate the CBM production of Pennsylv
Authors
S.M. Mardon, K.G. Takacs, J.C. Hower, C.F. Eble, Maria Mastalerz