Conference Papers
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Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Effect of sea-level rise on future coastal groundwater resources in southern Florida, USA Effect of sea-level rise on future coastal groundwater resources in southern Florida, USA
An existing variable‐density groundwater flow and solute transport model, developed for the northern part of Broward County, Florida, was used to predict the effect of sealevel rise on future coastal groundwater resources. Using average annual conditions from 2005, simulations were performed for 100 years into the future using four different rates of sea‐level rise: 0, 24, 48, and 88...
Authors
Christian D. Langevin, Michael R. Zygnerski, Jeremy T. White, Joseph D. Hughes
Flow resistance in open channels with fixed movable bed Flow resistance in open channels with fixed movable bed
In spite of an increasingly large body of research by many investigators, accurate quantitative prediction of open channel flow resistance remains a challenge. In general, the relations between the elements influencing resistance (turbulence, boundary roughness, and channel shape features, such as discrete obstacles, bars, channel curvature, recirculation areas, secondary circulation...
Authors
Francisco J. Simoes
Fluvial sediment in the environment: a national challenge Fluvial sediment in the environment: a national challenge
Sediment and sediment-associated constituents can contribute substantially to water-quality impairment. In the past, sediment was viewed mainly as an engineering problem that affected reservoir storage capacity, shipping channel maintenance, and bridge scour, as well as the loss of agricultural soil. Sediment is now recognized as a major cause of aquatic system degradation in many rivers...
Authors
Matthew C. Larsen, Allen C. Gellis, G. Douglas Glysson, John R. Gray, Arthur J. Horowitz
Functional linear models to test for differences in prairie wetland hydraulic gradients Functional linear models to test for differences in prairie wetland hydraulic gradients
Functional data analysis provides a framework for analyzing multiple time series measured frequently in time, treating each series as a continuous function of time. Functional linear models are used to test for effects on hydraulic gradient functional responses collected from three types of land use in Northeastern Montana at fourteen locations. Penalized regression-splines are used to...
Authors
Mark C. Greenwood, Richard S. Sojda, Todd M. Preston
Gas storage in the Upper Devonian-Lower Mississippian Woodford Shale, Arbuckle Mountains, Oklahoma: how much of a role do the cherts play? Gas storage in the Upper Devonian-Lower Mississippian Woodford Shale, Arbuckle Mountains, Oklahoma: how much of a role do the cherts play?
How gas is stored in shale-gas systems is a critical element in characterizing these potentially prolific, low-porosity/permeability reservoirs. An integrated mineralogic, geochemical, and porosity/permeability study is of the Upper Devonian-Lower Mississippian Woodford Shale, Arbuckle Mountains, southern Oklahoma, at locations previously described through detailed stratigraphic and...
Authors
Neil S. Fishman, Geoffrey S. Ellis, Stanley T. Paxton, Marvin M. Abbott, Adam Boehlke
Geometric evaluation and validation of aerial and satellite data using Sioux Falls Geometric test range Geometric evaluation and validation of aerial and satellite data using Sioux Falls Geometric test range
No abstract available.
Authors
Aparajithan Sampath, Donald Moe, Jon Christopherson, Gregory L. Stensaas
High resolution near-bed observations in winter near Cape Hatteras, North Carolina High resolution near-bed observations in winter near Cape Hatteras, North Carolina
The U.S. Geological Survey (USGS) Coastal and Marine Science Center in Woods Hole, Massachusetts, is leading an effort to understand the regional sediment dynamics along the coastline of North and South Carolina. As part of the Carolinas Coastal Change Processes Project, a geologic framework study in June of 2008 by the Woods Hole Coastal and Marine Science Center's Sea Floor Mapping...
Authors
Marinna A. Martini, Brandy N. Armstrong, John C. Warner
Hubble Space Telescope observations of Europa in and out of eclipse Hubble Space Telescope observations of Europa in and out of eclipse
Europa is a prime target for astrobiology and has been prioritized as the next target for a National Aeronautics and Space Administration flagship mission. It is important, therefore, that we advance our understanding of Europa, its ocean and physical environment as much as possible. Here, we describe observations of Europa obtained during its orbital eclipse by Jupiter using the Hubble...
Authors
W.B. Sparks, M. McGrath, K. Hand, H.C. Ford, P. Geissler, J.H. Hough, E.L. Turner, C.F. Chyba, R. Carlson, M. Turnbull
Hydrodynamic modeling of juvenile mussel dispersal in a large river: The potential effects of bed shear stress and other parameters Hydrodynamic modeling of juvenile mussel dispersal in a large river: The potential effects of bed shear stress and other parameters
Because unionid mussels have a parasitic larval stage, they are able to disperse upstream and downstream as larvae while attached to their host fish and with flow as juveniles after excystment from the host. Understanding unionid population ecology requires knowledge of the processes that affect juvenile dispersal prior to establishment. We examined presettlement (transport and...
Authors
J.A. Daraio, L.J. Weber, T.J. Newton
Integrated use of surface geophysical methods for site characterization — A case study in North Kingstown, Rhode Island Integrated use of surface geophysical methods for site characterization — A case study in North Kingstown, Rhode Island
A suite of complementary, non‐invasive surface geophysical methods was used to assess their utility for site characterization in a pilot investigation at a former defense site in North Kingstown, Rhode Island. The methods included frequency‐domain electromagnetics (FDEM), ground‐penetrating radar (GPR), electrical resistivity tomography (ERT), and multi‐channel analysis of surface‐wave...
Authors
Carole D. Johnson, John W. Lane, William C. Brandon, Christine A.P. Williams, Eric A. White
Long generation time delays the genetic response to habitat fragmentation in the threatened florida sand skink Long generation time delays the genetic response to habitat fragmentation in the threatened florida sand skink
A recent study showed that populations of the threatened Florida Sand Skink had limited loss of genetic diversity over the past 60 yr as a consequence of anthropogenic fragmentation. This study assumed that 60 yr represents 3037 generations for the Florida Sand Skink, but a new evaluation of markrecapture data shows that 60 yr represents only about 15 generations. This result suggests...
Authors
E.D. McCoy, J.Q. Richmond, H.R. Mushinsky, E.J. Britt, J.S. Godley
Longitudinal structure in temperate stream fish communities: evaluating conceptual models with temporal data Longitudinal structure in temperate stream fish communities: evaluating conceptual models with temporal data
Five conceptual models of longitudinal fish community organization in streams were examined: (1) niche diversity model (NDM), (2) stream continuum model (SCM), (3) immigrant accessibility model (IAM), (4) environmental stability model (ESM), and (5) adventitious stream model (ASM). We used differences among models in their predictions about temporal species turnover, along with five...
Authors
James H. Roberts, Nathaniel P. Hitt