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.
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Modeling mountain pine beetle disturbance in Glacier National Park using multiple lines of evidence
Temperate forest ecosystems are subject to various disturbances which contribute to ecological legacies that can have profound effects on the structure of the ecosystem. Impacts of disturbance can vary widely in extent, duration and severity over space and time. Given that global climate change is expected to increase rates of forest disturbance, an understanding of these events are critical in th
Authors
Timothy Assal, Jason Sibold
Delineation of fractures, foliation, and groundwater-flow zones of the bedrock at the Harlem River Tunnel in northern New York County, New York
Advanced borehole-geophysical methods were used to investigate the hydrogeology of the crystalline bedrock in 36 boreholes on the northernmost part of New York County, New York, for the construction of a utilities tunnel beneath the Harlem River. The borehole-logging techniques were used to delineate bedrock fractures, foliation, and groundwater-flow zones in test boreholes at the site. Fracture i
Authors
Frederick Stumm, Anthony Chu, Peter K. Joesten, Michael L. Noll, Michael D. Como
Correlation of geothermal springs with sub-surface fault terminations revealed by high-resolution, UAV-acquired magnetic data
There is widespread agreement that geothermal springs in extensional geothermal systems are concentrated at fault tips and in fault interaction zones where porosity and permeability are dynamically maintained (Curewitz and Karson, 1997; Faulds et al., 2010). Making these spatial correlations typically involves geological and geophysical studies in order to map structures and their relationship to
Authors
Jonathan M.G. Glen, A.E. Egger, C. Ippolito, N.Athens
Oak woodlands and forests fire consortium: A regional view of fire science sharing
The Joint Fire Science Program established 14 regional fire science knowledge exchange consortia to improve the delivery of fire science information and communication among fire managers and researchers. Consortia were developed regionally to ensure that fire science information is tailored to meet regional needs. In this paper, emphasis was placed on the Oak Woodlands and Forests Fire Consortium
Authors
Keith W. Grabner, Michael C. Stambaugh, Joseph M. Marschall, Erin R. Abadir
Wetland dynamics influence mid-continent duck recruitment
Recruitment is a key factor influencing duck population dynamics. Understanding what regulates recruitment of ducks is a prerequisite to informed habitat and harvest management. Quantity of May ponds (MP) has been linked to recruitment and population size (Kaminski and Gluesing 1987, Raveling and Heitmeyer 1989). However, wetland productivity (quality) is driven by inter-annual hydrological fluctu
Authors
Michael J. Anteau, Aaron T. Pearse, Michael L. Szymankski
The anomalous circulation associated with the ENSO-related west Pacific sea surface temperature gradient
El Nino - Southern Oscillation (ENSO) events are accompanied by an anomalous zonal sea surface temperature (SST) gradient over the west Pacific Ocean, defined hereafter as the west Pacific SST gradient (WPG). While the direction of the WPG follows ENSO cycles, the magnitude of the gradient varies considerably between individual El Nino and La Nina events. In this study, El Nino and La Nina events
Authors
Andrew Hoell, Christopher C. Funk
Emergent wetlands status and trends in the northern Gulf of Mexico: 1950-2010
Throughout the past century, emergent wetlands have been declining across the Gulf of Mexico. Emergent wetland ecosystems provide many resources, including plant and wildlife habitat, commercial and recreational economic activity, water quality, and natural barriers against storms. As emergent wetland losses increase, so does the need for information on the causes and effects of this loss; emergen
Changes to oak woodland stand structure and ground flora composition caused by thinning and burning
Our objective was to quantify the cumulative effects of prescribed
burning and thinning on forest stocking and species composition at a woodland
restoration experiment site in the Ozark Highlands of Missouri. Our study used four
treatments (burn, harvest, harvest and burn, control) on three slope position and aspect
combinations (south, north, ridge) replicated in three complete blocks. Harvest
Authors
Carter O. Kinkead, John M. Kabrick, Michael C. Stambaugh, Keith W. Grabner
Investigating the potential impact of efflorescent mineral crusts on water quality: complementing analytical techniques with geochemical modelling
Efflorescent crusts are a common feature forming on the surface of gold mining sites
and tailings storage facilities during the dry season. Their dissolution at the start of the wet sea-
son releases an acidic pulse of water rich in metal pollutants. The composition of the crusts is
indicative of the water from which they precipitated. This study aimed at assessing the crust
formation and dissolut
Authors
Bronwyn Camden-Smith, Raymond H. Johnson, Robert Richardson, David Billing, Hlanganani Tutu
Reactive transport modeling at uranium in situ recovery sites: uncertainties in uranium sorption on iron hydroxides
Geochemical changes that can occur down gradient from uranium in situ recovery (ISR) sites are important for various stakeholders to understand when evaluating potential effects on surrounding groundwater quality. If down gradient solid-phase material consists of sandstone with iron hydroxide coatings (no pyrite or organic carbon), sorption of uranium on iron hydroxides can control uranium mobilit
Authors
Raymond H. Johnson, Hlanganani Tutu
Estimating direct fatality impacts at wind farms: how far we’ve come, where we have yet to go
Measuring the potential impacts of wind farms on wildlife can be difficult and may require development
of new statistical tools and models to accurately reflect the measurement process. This presentation
reviews the recent history of approaches to estimating wildlife fatality under the unique conditions
encountered at wind farms, their unifying themes and their potential shortcomings. Avenues o
Authors
Manuela M. Huso
The water-quality effects of a bulkhead installed in the Dinero mine tunnel, near Leadville, Colorado
No abstract available.
Authors
Katherine Walton-Day, Taylor J. Mills, Adolph Amundson, Kato T. Dee, Melissa R. Relego, Caitlin Borbely