Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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: 5547
Efficiently approximating the Pareto frontier: Hydropower dam placement in the Amazon basin Efficiently approximating the Pareto frontier: Hydropower dam placement in the Amazon basin
Real–world problems are often not fully characterized by a single optimal solution, as they frequently involve multiple competing objectives; it is therefore important to identify the so-called Pareto frontier, which captures solution trade-offs. We propose a fully polynomial-time approximation scheme based on Dynamic Programming (DP) for computing a polynomially succinct curve that...
Authors
Xiaojian Wu, Jonathan Gomes-Selman, Qinru Shi, Yexiang Xue, Roosevelt Garcia-Villacorta, Eliza Anderson, Suresh Sethi, Scott Steinschneider, Alexander Flecker, Carla P. Gomes
Landsat-8 on-orbit and Landsat-9 pre-launch sensor radiometric characterization Landsat-8 on-orbit and Landsat-9 pre-launch sensor radiometric characterization
Landsat-8 has been operating on-orbit for 5+ years. Its two sensors, the Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS), are continuing to produce high quality data. The OLI has been radiometrically stable at the better than 0.3% level on a band average basis for all but the shortest wavelength (443 nm) band, which has degraded about 1.3% since launch. All on-board...
Authors
Brian L. Markham, Julia A Barsi, Matthew Montanaro, Joel T McCorkel, Aaron Gerace, Jeffrey A. Pedelty, Simon J Hook, Nina G. Raqueno, Cody Anderson, Obaidul Haque
Mapping interactive geospatial linked data Mapping interactive geospatial linked data
No abstract available.
Authors
William Baumer, Logan J. Powell, Dalia E. Varanka
The Southern Appalachian Brook Trout management conundrum: What should restoration look like in the 21st Century? The Southern Appalachian Brook Trout management conundrum: What should restoration look like in the 21st Century?
Brook Trout Salvelinus fontinalis in the southern Appalachian portion of their range have been isolated in remote headwater systems for millennia. Recent genetic investigations indicate extremely low allelic diversity, heterozygosity and effective population sizes in many streams. In populations restored using multiple source stocks, limited introgression has been observed despite source...
Authors
Matt A. Kulp, Shawna Mitchell, David C. Kazyak, Bernard R. Kuhajda, Jason Henegar, T. Casey Weathers, Anna George, Joshua R. Ennen, Tim King
Are nest boxes ecological traps for red-footed falcons Falco vespertinius at Naurzum Are nest boxes ecological traps for red-footed falcons Falco vespertinius at Naurzum
Nest box programs are frequently implemented for conservation of cavity-nesting birds, but their effectiveness is rarely evaluated in comparison to birds not using nest boxes. In the European Palearctic, Red-Footed Falcon (Falco vespertinus) populations are both of high conservation concern and are strongly associated with nest box programs in heavily managed landscapes. We used a 21...
Authors
Todd E. Katzner, Alexander E. Bragin, Evgeny A. Bragin
High-resolution seismic imaging of depositional characteristics at gas hydrate research sites in the Gulf of Mexico High-resolution seismic imaging of depositional characteristics at gas hydrate research sites in the Gulf of Mexico
No abstract available.
Authors
Seth S. Haines, Timothy S. Collett, Patrick E. Hart, B. Shedd, P. Weimer, M. Frye, R. Boswell
Implications of refining vertical resolution of hydraulic conductivity in the numerical modeling of groundwater flow to surface water, NAS Whiting Field, Florida Implications of refining vertical resolution of hydraulic conductivity in the numerical modeling of groundwater flow to surface water, NAS Whiting Field, Florida
Naval Air Station Whiting Field is located near Milton, Florida and is one of the Navy's two primary pilot training bases. Commissioned in 1943, historic operations at Whiting Field generated industrial wastes that contaminated soil and the water-table aquifer. The Environmental Protection Agency placed Whiting Field on the Superfund program’s National Priorities List of contaminated...
Authors
Eric D. Swain, Bruce G. Campbell, James Landmeyer
Preliminary-assessment and upgrade of a groundwater flow model of the Seacoast Bedrock Aquifer, New Hampshire Preliminary-assessment and upgrade of a groundwater flow model of the Seacoast Bedrock Aquifer, New Hampshire
In 2003 and 2004, the U.S. Geological Survey investigated the availability of groundwater resources in a 160-square mile area of coastal New Hampshire (Figure 1) using a regional groundwater flow model (Mack, 2009). At that time, population growth and increasing water demand prompted concern for the sustainability of the region’s groundwater resources in a fractured-crystalline bedrock...
Authors
Thomas J. Mack
Preliminary assessment of porphyry copper deposits in the Sierra Maestra, Cuba Preliminary assessment of porphyry copper deposits in the Sierra Maestra, Cuba
The U.S. Geological Survey’s “three-step” form of mineral-resource assessment was used to obtain a preliminary estimate of copper resources in undiscovered porphyry deposits of the Paleogene Sierra Maestra Arc. Results of this preliminary assessment suggest that a mean of 3.2 undiscovered deposits are likely present. This estimate is comparable to results from an independently-derived...
Authors
Lukas Zurcher, Floyd Gray, Timothy Hayes, Greta J. Orris, Mark E. Gettings, Mark D. Cocker, Leila Gass
Analysis of artificially matured shales with confocal laser scanning raman microscopy: Applications to organic matter characterization Analysis of artificially matured shales with confocal laser scanning raman microscopy: Applications to organic matter characterization
Raman spectroscopy has been suggested as a method for characterizing the thermal maturity of rocks. The literature contains many empirical correlations between thermal maturity proxies, such as vitrinite reflectance (VRo) and pyrolysis-Tmax, with spectral metrics such as Raman peak-widths, peak-center positions, peak-areas and all manner of differences and ratios of these parameters...
Authors
Grant A. Myers, Kelsey Kehoe, Paul C. Hackley
Analysis of the age and paleomagnetic orientation of the Broadwell Mesa Basalt, Bristol Mountains, CA Analysis of the age and paleomagnetic orientation of the Broadwell Mesa Basalt, Bristol Mountains, CA
To add to the regional paleomagnetic data documenting block rotation in eastern California, we determined the age and paleomagnetic rotation of the Broadwell Mesa basalt, a basalt in the Bristol Mountains, CA as part of an effort to constrain the timing and rotation of blocks adjacent to the fault. The east-striking sinistral Broadwell Mesa fault cuts and separates the basalt into two...
Authors
Geoffrey Phelps, John Hillhouse, Robert J. Fleck, David M. Miller, David C. Buesch, Andrew J. Cyr, Kevin M. Schmidt
Spectral properties of anhydrous carbonates and nitrates Spectral properties of anhydrous carbonates and nitrates
No abstract available.
Authors
J.L. Bishop, S.J. King, M.D. Lane, B. Lafuente, A. J. Brown, T. Hiroi, Gregg A. Swayze, J.-F. Lin