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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Applications for General Purpose Command Buffers: The Emergency Conjunction Avoidance Maneuver 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...
Authors
Robert J Scheid, Martin England
Bigheaded carps of the Yangtze and Mississippi Rivers: Biology, status, and management 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 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...
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 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)...
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 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...
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 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...
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: 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...
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 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 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...
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 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...
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 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
Vulnerability of shortgrass prairie bird assemblages to climate change Vulnerability of shortgrass prairie bird assemblages to climate change
The habitats and resources needed to support grassland birds endemic to North American prairie ecosystems are seriously threatened by impending climate change. To assess the vulnerability of grassland birds to climate change, we consider various components of vulnerability, including sensitivity, exposure, and adaptive capacity (Glick et al. 2011). Sensitivity encompasses the innate
Authors
Susan K. Skagen, Victoria Dreitz, Reesa Y. Conrey, Amy Yackel, Arvind O. Panjabi