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: 5599
Volcano surveillance by ACR silver fox Volcano surveillance by ACR silver fox
Recent growth in the business of unmanned air vehicles (UAVs) both in the US and abroad has improved their overall capability, resulting in a reduction in cost, greater reliability and adoption into areas where they had previously not been considered. Uses in coastal and border patrol, forestry and agriculture have recently been evaluated in an effort to expand the observed area and...
Authors
M.C.L. Patterson, A. Mulligair, J. Douglas, J. Robinson, J.S. Pallister
Wolf population persistence in real life Wolf population persistence in real life
Wolf (Canis lupus) populations tend to be resilient and to persist for long periods, and several characteristics contribute to their resilience and persistence: (1) age of first reproduction (2-3 years), (2) high annual litter size (mean = 6), (3) low dispersal age (1-3 years), and (4) long potential dispersal distance ( 880 km). The only documented factor leading to extinction of well...
Authors
L.D. Mech
Nitrogen transformations in hot spring runoff, Yellowstone National Park, WY Nitrogen transformations in hot spring runoff, Yellowstone National Park, WY
No abstract available.
Authors
JoAnn M. Holloway, D. Kirk Nordstrom, R. L. Smith
Combined use of borehole geophysics and packers to site potable wells in a contaminated area in Montville, Connecticut Combined use of borehole geophysics and packers to site potable wells in a contaminated area in Montville, Connecticut
A leaking underground gasoline tank contaminated a crystalline bedrock aquifer in Montville, Connecticut, USA with MTBE and benzene. At the original residential bedrock supply wells, the median MTBE concentration was 165 micrograms per liter (mg/L), and the median benzene concentration was 320 mg/L. The maximum concentrations of MTBE and benzene were 4,300 mg/l and 1,700 mg/L...
Authors
A. Green, John W. Lane, Carole D. Johnson, John H. Williams, Remo A. Mondazzi, Peter K. Joesten
Time-series monitoring in fractured-rock aquifers Time-series monitoring in fractured-rock aquifers
Time-lapse monitoring of subsurface processes is an emerging and promising area of hydrogeophysics. The combined use of non-invasive or minimally invasive geophysical methods with hydraulic and geochemical sampling is a cost-effective approach for aquifer characterization, long-term aquifer monitoring, and remediation monitoring. Time-lapse geophysical surveys can indirectly measure time...
Authors
Carole D. Johnson, John W. Lane, Frederick D. Day-Lewis
U-Series isotopes as indicators of water/rock interaction in the unsaturated zone at Yucca Mountain, Nevada, USA U-Series isotopes as indicators of water/rock interaction in the unsaturated zone at Yucca Mountain, Nevada, USA
No abstract available.
Authors
James B. Paces, Leonid A. Neymark
High resolution climate of the past 3,500 years of coastal northernmost California High resolution climate of the past 3,500 years of coastal northernmost California
No abstract available.
Authors
John A. Barron, Linda E. Heusser, Clark Alexander
Acidity and Alkalinity in mine drainage: Practical considerations Acidity and Alkalinity in mine drainage: Practical considerations
In this paper, we emphasize that the Standard Method hot peroxide treatment procedure for acidity determination (hot acidity) directly measures net acidity or net alkalinity, but that more than one water-quality measure can be useful as a measure of the severity of acid mine drainage. We demonstrate that the hot acidity is related to the pH, alkalinity, and dissolved concentrations of Fe...
Authors
III Cravotta, Carl S. Kirby
Acidity and alkalinity in mine drainage: Theoretical considerations Acidity and alkalinity in mine drainage: Theoretical considerations
Acidity, net acidity, and net alkalinity are widely used parameters for the characterization of mine drainage, but these terms are not well defined and are often misunderstood. Incorrect interpretation of acidity, alkalinity, and derivative terms can lead to inadequate treatment design or poor regulatory decisions. We briefly explain derivations of theoretical expressions of three types...
Authors
Carl S. Kirby, Charles A. Cravotta
Analysis of summer 2002 melt extent on the Greenland ice sheet using MODIS and SSM/I data Analysis of summer 2002 melt extent on the Greenland ice sheet using MODIS and SSM/I data
Previous work has shown that the summer of 2002 had the greatest area of snow melt extent on the Greenland ice sheet ever recorded using passive-microwave data. In this paper, we compare the 0deg isotherm derived from the Moderate-Resolution Imaging Spectroradiometer (MODIS) instrument, with Special Sensor Microwave/Imager (SSM/I)-derived melt, at the time of the maximum melt extent in...
Authors
D. K. Hall, R.S. Williams, K. Steffen, Janet Y.L. Chien
Voxels as a representation of multiple-return Lidar data Voxels as a representation of multiple-return Lidar data
No abstract available.
Authors
Jason M. Stoker