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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Copper toxicity and organic matter: Resiliency of watersheds in the Duluth Complex, Minnesota, USA
We estimated copper (Cu) toxicity in surface water with high dissolved organic matter (DOM) for unmined mineralized watersheds of the Duluth Complex using the Biotic Ligand Model (BLM), which evaluates the effect of DOM, cation competition for biologic binding sites, and metal speciation. A sediment-based BLM was used to estimate stream-sediment toxicity; this approach factors in the cumulative ef
Authors
Nadine M. Piatak, Robert Seal, Perry M. Jones, Laurel G. Woodruff
Dealing with largemouth bass virus: benefits of multisector collaboration
Largemouth bass virus (LMBV), a recently identified pathogen, affected largemouth bass (Micropterus salmoides) in the southeastern United States beginning in the 1990s. Concern about the impacts of this little-known pathogen on largemouth bass populations, effects on fisheries management, and the need to provide anglers and the media with consistent and accurate information prompted a private orga
Authors
David R. Terre, Harold Schramm, John M. Grizzle, Loraine T. Fries
Evaluation of multiple-frequency, active and passive acoustics as surrogates for bedload transport
The use of multiple-frequency, active acoustics through deployment of acoustic Doppler current profilers (ADCPs) shows potential for estimating bedload in selected grain size categories. The U.S. Geological Survey (USGS), in cooperation with the University of Montana (UM), evaluated the use of multiple-frequency, active and passive acoustics as surrogates for bedload transport during a pilot study
Authors
Molly S. Wood, Ryan L. Fosness, Gregory Pachman, Mark Lorang, Diego Tonolla
Evaluation of vector coastline features extracted from 'structure from motion'-derived elevation data
For extensive and remote coastlines, the absence of high-quality elevation models—for example, those produced with lidar—leaves some coastal populations lacking one of the essential elements for mapping shoreline positions or flood extents. Here, we compare seven different elevation products in a lowlying area in western Alaska to establish their appropriateness for coastal mapping applications th
Authors
Nicole Kinsman, Ann E. Gibbs, Matt Nolan
Evidence for outcrop-scale deformation band faults on Mars from Curiosity rover imagery
No abstract available.
Authors
Jonathan S. Caine, Ryan B. Anderson, Kenneth E. Herkenhoff, Glynis M. Parrett
Final project memorandum: sea-level rise modeling handbook: resource guide for resource managers, engineers, and scientists
Coastal wetlands of the Southeastern United States are undergoing retreat and migration from increasing tidal inundation and saltwater intrusion attributed to climate variability and sea-level rise. Much of the literature describing potential sea-level rise projections and modeling predictions are found in peer-reviewed academic journals or government technical reports largely suited to reading by
Authors
Thomas W. Doyle
Guide to luminescence dating techniques and their application for paleoseismic research
Over the past 25 years, luminescence dating has become a key tool for dating sediments of interest in paleoseismic research. The data obtained from luminescence dating has been used to determine timing of fault displacement, calculate slip rates, and estimate earthquake recurrence intervals. The flexibility of luminescence is a key complement to other chronometers such as radiocarbon or cosmogenic
Authors
Harrison J. Gray, Shannon A. Mahan, Tammy M. Rittenour, Michelle Summa Nelson
Hindcast of water availability in regional aquifer systems using MODFLOW Farm Process
Coupled groundwater and surface-water components of the hydrologic cycle can be simulated by the Farm Process for MODFLOW (MF-FMP) in both irrigated and non-irrigated areas and aquifer-storage and recovery systems. MF-FMP is being applied to three productive agricultural regions of different scale in the State of California, USA, to assess the availability of water and the impacts of alternative m
Authors
Wolfgang Schmid, Randall T. Hanson, Claudia C. Faunt, Steven P. Phillips
Hydrodynamic modeling to evaluate the influence of constructed side-channel habitat on larval drift of pallid strugeon in the Lower Missouri River
Larval drift is a critical phase of ontogeny for many species of lotic fishes. Downstream advection and dispersion of drifting larvae or eggs is controlled by the complex interaction of flow regime, channel planform, local channel morphology, and the resulting hydraulic gradients. In many regulated rivers, channel engineering and perturbations to the flow regime may disrupt natural dispersal proce
Authors
Susannah O. Erwin, Robert B. Jacobson
Hydrologic and geochemical dynamics of vadose zone recharge in a mantled karst aquifer: Results of monitoring drip waters in Mystery Cave, Minnesota
Caves provide direct access to flows through the vadose zone that recharge karst aquifers. Although many recent studies have documented the highly dynamic processes associated with vadose zone flows in karst settings, few have been conducted in mantled karst settings, such as that of southeastern Minnesota. Here we present some results of a long-term program of cave drip monitoring conducted withi
Authors
Daniel H. Doctor, E. Calvin Alexander, Roy A. Jameson, Scott C. Alexander
Identifying sediment sources in the sediment TMDL process
Sediment is an important pollutant contributing to aquatic-habitat degradation in many waterways of the United States. This paper discusses the application of sediment budgets in conjunction with sediment fingerprinting as tools to determine the sources of sediment in impaired waterways. These approaches complement monitoring, assessment, and modeling of sediment erosion, transport, and storage in
Authors
Allen C. Gellis, Faith A. Fitzpatrick, Joseph P. Schubauer-Berigan, R.B. Landy, Lillian E. Gorman Sanisaca
Late Jurassic – early Cretaceous inversion of rift structures, and linkage of petroleum system elements across post-rift unconformity, U.S. Chukchi Shelf, arctic Alaska
Basin evolution of the U.S. Chukchi shelf involved multiple phases, including Late Devonian–Permian rifting, Permian–Early Jurassic sagging, Late Jurassic–Neocomian inversion, and Cretaceous–Cenozoic foreland-basin development. The focus of ongoing exploration is a petroleum system that includes sag-phase source rocks; inversion-phase reservoir rocks; structure spanning the rift, sag, and inversio
Authors
David W. Houseknecht, Christopher D. Connors