Conference Papers
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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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Field evaluation of shallow-water acoustic doppler current profiler discharge measurements
In 2004, the U.S. Geological Survey (USGS) Office of Surface Water staff and USGS Water Science employees began testing the StreamPro, an acoustic Doppler current profiler (ADCP) for shallow-water discharge measurements. Teledyne RD Instruments introduced the StreamPro in December of 2003. The StreamPro is designed to make a "moving boat" discharge measurement in streams with depths between 0.15 a
Authors
M.S. Rehmel
Genetic algorithm based adaptive neural network ensemble and its application in predicting carbon flux
To improve the accuracy in prediction, Genetic Algorithm based Adaptive Neural Network Ensemble (GA-ANNE) is presented. Intersections are allowed between different training sets based on the fuzzy clustering analysis, which ensures the diversity as well as the accuracy of individual Neural Networks (NNs). Moreover, to improve the accuracy of the adaptive weights of individual NNs, GA is used to op
Authors
Y. Xue, S. Liu, Y. Hu, J. Yang, Q. Chen
Genetic markers and the coregonid problem
Coregonid fishes are the forage base in many ecosystems in the northern hemisphere and they have traditionally been part of commercial and native fisheries. Coregonids display extreme variability in morphology, life history, and behavior. Defining boundaries among coregonid taxa has been (and continues to be) the focus of many studies. Cytogenetic, biochemical, and molecular methods have been used
Authors
W. Stott, T. N. Todd
Genetic studies of freshwater turtle and tortoises: a review of the past 70 years
Powerful molecular techniques have been developed over many decades for resolving genetic relationships, population genetic structure, patterns of gene flow, mating systems, and the amount of genetic diversity in animals. Genetic studies of turtles were among the earliest and the rapid application of new genetic tools and analytical techniques is still apparent in the literature on turtles. At pre
Authors
Nancy N. FitzSimmons, Kristen M. Hart
Geochemistry of natural components in the near-field environment, Yucca Mountain, Nevada
The natural near-field environment in and around the emplacement drifts of the proposed nuclear waste repository at Yucca Mountain, Nevada, includes the host rock, dust, seepage, and pore water. The chemical compositions of these components have been determined for assessing possible chemical and mineralogical reactions that may occur after nuclear waste is emplaced. The rock hosting the proposed
Authors
Z. E. Peterman, T.A. Oliver
Geologic characterization of shelf areas using usSEABED for GIS mapping, modeling processes and assessing marine sand and gravel resources
Geologic maps depicting offshore sedimentary features serve many scientific and applied purposes. Such maps have been lacking, but recent computer technology and software offer promise in the capture and display of diverse marine data. Continental margins contain landforms which provide a variety of important functions and contain important sedimentary records. Some shelf areas also contain deposi
Authors
S.J. Williams, J. D. Bliss, M.A. Arsenault, C.J. Jenkins, J.A. Goff
Geologic framework of the long bay inner shelf: implications for coastal evolution in South Carolina
The inner continental shelf off northern South Carolina is a sediment-limited environment characterized by extensive hardground areas, where coastal plain strata and ancient channel-fill deposits are exposed at the sea floor. Holocene sand is concentrated in large shoals associated with active tidal inlets, an isolated shore-detached sand body, and a widespread series of low-relief sand ridges. Th
Authors
W. Barnhardt, J. Denny, W. Baldwin, W. Schwab, R. Morton, P. Gayes, N. Driscoll
Geophysical data integration and conditional uncertainty analysis on hydraulic conductivity estimation
Integration of various geophysical data is essential to better understand aquifer heterogeneity. However, data integration is challenging because there are different levels of support between primary and secondary data needed to be correlated in various ways. This study proposes a geostatistical method to integrate the hydraulic conductivity measurements and electrical resistivity data to better e
Authors
A. Rahman, F.T.-C. Tsai, C.D. White, D.A. Carlson, C. S. Willson
Geothermometer calculations for geothermal assessment
Geothermal exploration programs have relied on the calculation of geothermometers from hot spring chemistry as an early estimation of geothermal reservoir temperatures. Calibration of the geothermometers has evolved from experimental determinations of mineral solubility as a function of temperature to calibration from analyses of water chemistry from known depths and temperatures in thermal wells.
Authors
M.J. Reed, Robert H. Mariner
Glacier mass-balance fluctuations in the Pacific Northwest and Alaska, USA
The more than 40 year record of net and seasonal mass-balance records from measurements made by the United States Geological Survey on South Cascade Glacier, Washington, and Wolverine and Gulkana Glaciers, Alaska, shows annual and interannual fluctuations that reflect changes in the controlling climatic conditions at regional and global scales. As the mass-balance record grows in length, it is rev
Authors
E.G. Josberger, W.R. Bidlake, R.S. March, B.W. Kennedy
High-resolution measurements of suspended-sediment
No abstract available.
Authors
David J. Topping, Scott Wright, Theodore S. Melis, David M. Rubin
High-resolution shallow reflection seismic image and surface evidence of the Upper Tiber Basin active faults (Northern Apennines, Italy)
Shallow seismic reflection prospecting has been carried out in order to investigate the faults that bound to the southwest and northeast the Quaternary Upper Tiber Basin (Northern Apennines, Italy). On the northeastern margin of the basin a ??? 1 km long reflection seismic profile images a fault segment and the associated up to 100 meters thick sediment wedge. Across the southwestern margin a 0.5
Authors
D.D. Donne, L. Plccardi, J. K. Odum, W. J. Stephenson, R. A. Williams