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.
Filter Total Items: 5321
Spatial differences in hydrologic characteristics and water chemistry of a temperate coastal plain peatland: The Great Dismal Swamp, USA
Spatial differences in hydrologic processes and geochemistry across forested peatlands control the response of the wetland-community species and resiliency to natural and anthropogenic disturbances. Knowing these controls is essential to effectively managing peatlands as resilient wetland habitats. The Great Dismal Swamp is a 45,325 hectare peatland in the Atlantic Coastal Plain of Virginia and No
Authors
Gary K. Speiran, Frederick C. Wurster
Applications for General Purpose Command Buffers: The Emergency Conjunction Avoidance Maneuver
A case study is presented for the use of Relative Operation Sequence (ROS) command buffers to quickly execute a propulsive maneuver to avoid a collision with space debris. In this process, a ROS is custom-built with a burn time and magnitude, uplinked to the spacecraft, and executed in 15 percent of the time of the previous method. This new process provides three primary benefits. First, the plann
Authors
Robert J Scheid, Martin England
Bigheaded carps of the Yangtze and Mississippi Rivers: Biology, status, and management
No abstract available.
Authors
Duane Chapman, Daqing Chen, Jan J. Hoover, Hao Du, Quinton E. Phelps, Li Shen, Chenyou Wang, Qiwei Wei, Hui Zhang
Field scale test of multi-dimensional flow and morphodynamic simulations used for restoration design analysis
Two- and three-dimensional morphodynamic simulations are becoming common in studies of channel form and process. The performance of these simulations are often validated against measurements from laboratory studies. Collecting channel change information in natural settings for
model validation is difficult because it can be expensive and under most channel forming flows the resulting channel cha
Authors
Richard R. McDonald, Jonathan M. Nelson, Ryan L. Fosness, Peter O. Nelson
Noncontact methods for measuring water-surface elevations and velocities in rivers: Implications for depth and discharge extraction
Recently developed optical and videographic methods for measuring water-surface properties in a noninvasive manner hold great promise for extracting river hydraulic and bathymetric information. This paper describes such a technique, concentrating on the method of infrared videog-
raphy for measuring surface velocities and both acoustic (laboratory-based) and laser-scanning (field-based) technique
Authors
Jonathan M. Nelson, Paul J. Kinzel, Richard R. McDonald, Mark Schmeeckle
Late Neogene deformation of the Chocolate Mountains Anticlinorium: Implications for deposition of the Bouse Formation and early evolution of the Lower Colorado River
Deformation related to late Neogene dextral shear can explain a shift from an estuarine to lacustrine depositional environment in the southern Bouse Formation north of Yuma, Arizona. We infer that late Neogene deformation in the Chocolate Mountain Anticlinorium (CMA) created a barrier that blocked an estuary inlet, and that pre-existing and possibly active structures subsequently controlled the lo
Authors
Sue Beard, Gordon B. Haxel, Rebecca J. Dorsey, Kristin A. McDougall, Carl E. Jacobsen
GIS methodology for geothermal play fairway analysis: Example from the Snake River Plain volcanic province
Play fairway analysis in geothermal exploration derives from a systematic methodology originally developed within the petroleum industry and is based on a geologic and hydrologic framework of identified geothermal systems. We are tailoring this methodology to study the geothermal resource potential of the Snake River Plain and surrounding region. This project has contributed to the success of this
Authors
Jacob DeAngelo, John W. Shervais, Jonathan M. Glen, Dennis L. Nielson, Sabodh Garg, Patrick Dobson, Erika Gasperikova, Eric Sonnenthal, Charles Visser, Lee M. Liberty, Drew Siler, James P. Evans, Sean Santellanes
Accretionary lapilli: what’s holding them together?
Accretionary lapilli from Tagus cone, Isla Isabela, Galápagos were analyzed using scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) techniques. Our main findings are (1) the lapilli formed and hardened in a few minutes while still aloft in the dispersing eruption column. (2) Palagonite rinds developed first on the basaltic glass clasts, and subsequently crystallized
Authors
Paul M. Adams, David K. Lynch, David C. Buesch
Architecture, geochemistry, and paleomagnetic directions of the 5.42 Ma Broadwell Mesa basalt volcanic field, Bristol Mountains, California
No abstract available.
Authors
David C. Buesch, Geoffrey Phelps
Depredation of the California Ridgway’s rail: Causes and distribution
We studied the causes of mortality for the California Ridgway’s rail at multiple tidal marshes in the San Francisco Bay Estuary, California. We radio-marked 196 individual rails and examined the evidence from 152 recovered California Ridgway’s rail mortalities from our radio-marked sample and determined plausible cause of death from a wide array of evidence. We also included 10 additional Californ
Authors
Michael L. Casazza, Cory T. Overton, Thuy-Vy D. Bui, John Y. Takekawa, Angela M. Merritt, J.M. Hull
Detection and quantification of hydrocarbons in sediments
A new technology developed by the US Geological Survey now allows for fast, direct detection of hydrocarbon plumes both in rivers and drifting in the deep ocean. Recent experiments show that the method can also detect and quantify hydrocarbons buried in river sediments and estuaries. This approach uses a variant of induced polarization, a surface-sensitive physical property of certain polarizable
Authors
Jeff Wynn, Mike Williamson, Jeff Frank
Simulated effect of topography and soil properties on hydrologic response and landslide potential under variable rainfall conditions in the Oregon Coast Range, USA
No abstract available.
Authors
Benjamin B. Mirus, Joel B. Smith, Jonathan W. Godt, R.L. Baum, Jeffrey A. Coe