Potentiometric surface of groundwater-level altitudes near the planned Highway 270 bypass, east of Hot Springs, Arkansas, July–August 2017
Anna M. Nottmeier, Phillip D. Hays
2019, Scientific Investigations Map 3444
The Ouachita Mountains aquifer system potentiometric-surface map is one component of the Hot Springs Bypass Groundwater Monitoring Project. The potentiometric-surface map provides a baseline assessment of shallow groundwater levels and flow directions before the construction of the Arkansas Department of Transportation planned extension of the Highway 270 bypass, east of...
Heterogeneity in hyporheic flow, pore water chemistry, and microbial community composition in an alpine streambed
A.R. Nelson, A. Sawyer, R. Gabor, C. Saup, S. Bryant, K. Harris, Martin A. Briggs, Kenneth Williams, M. J. Wilkins
2019, Journal of Geophysical Research: Biogeosciences (124) 3465-3478
The hyporheic zone, where surface water and groundwater mix, is an important microbial habitat where biogeochemical reactions influence water quality. We show that spatial variability in hyporheic flow in the East River near Crested Butte, Colorado, drives heterogeneity in streambed geochemical conditions and microbial community assemblages, but the diversity of...
Advances in quantifying streamflow variability across continental scales: 2. Improved model regionalization and prediction uncertainties using hierarchical Bayesian methods
Richard B. Alexander, Gregory E. Schwarz, Elizabeth W. Boyer
2019, Water Resources Research (55) 11061-11087
The precise estimation of process effects in hydrological models requires applying models to large scales with extensive spatial variability in controlling factors. Despite progress in large‐scale applications of hydrological models in conterminous United States (CONUS) river basins, spatial constraints in model parameters have prevented the interbasin...
Using stream-side groundwater discharge for geochemical exploration in mountainous terrain
Andrew H. Manning, Jean M. Morrison, Richard B. Wanty, Christopher T. Mills
2019, Journal of Geochemical Exploration (209)
Groundwater chemistry has been predominantly used in geochemical exploration studies to identify mineralized targets concealed under transported cover in areas with gentle topography. Another potentially valuable ap-plication that has received little attention is using groundwater chemistry to identify deposits concealed within mountain ridges. A number of geochemical exploration studies have...
Detailed Lithologic Logs from Auger Holes in southern Charleston County, southwestern Dorchester County, and eastern Colleton County, South Carolina
Robert E. Weems, William C. Lewis
2019, Open-File Report 2019-1119
The lithologic logs described in this open-file report are from holes augered in the South Carolina Low Country in parts of Charleston, Dorchester, and Colleton Counties from 1998 through 2010. Lithologic units described here include not only surficial Pleistocene units but also subsurface stratigraphic units ranging as far back in...
Overview, chronology, and impacts of the 2016–2017 eruption of Bogoslof volcano, Alaska
Michelle L. Coombs, Kristi L. Wallace, Cheryl Cameron, John J. Lyons, Aaron Wech, Kim M. Angeli, Peter Cervelli
2019, Bulletin of Volcanology (81)
The 2016–2017 eruption of Bogoslof volcano, a back-arc shallow submarine volcano in Alaska’s Aleutian arc, began in December 2016 and included 70 explosive events and at least two episodes of subaerial dome building. Because the volcano had no local monitoring stations during the eruption, a combination of distant seismic stations,...
Optimization of salt marsh management at the Rhode Island National Wildlife Refuge Complex through use of structured decision making
Hilary A. Neckles, James E. Lyons, Jessica L. Nagel, Susan C. Adamowicz, Toni Mikula, Nicholas T. Ernst
2019, Open-File Report 2019-1103
Structured decision making is a systematic, transparent process for improving the quality of complex decisions by identifying measurable management objectives and feasible management actions; predicting the potential consequences of management actions relative to the stated objectives; and selecting a course of action that maximizes the total benefit achieved and balances...
Coseismic slip and early afterslip of the M6.0 August 24, 2014 South Napa, California, earthquake
Frederick Pollitz, Jessica R. Murray, Sarah E. Minson, Charles W. Wicks Jr., Jerry L. Svarc, Benjamin A. Brooks
2019, Journal of Geophysical Research (124) 11728-11747
We employ strong motion seismograms and static offsets from the Global Positioning System, Interferometric Synthetic Aperture Radar, and other measurements in order to derive a coseismic slip and afterslip model of the M6.0 24 August 2014 South Napa earthquake. This earthquake ruptured an ∼13‐km‐long portion of...
Tropical cyclones alter short-term activity patterns of a coastal seabird
B. P. Wilkinson, Y. G. Satge, J. S. Lamb, Patrick G.R. Jodice
2019, Movement Ecology (7)
BackgroundMobile organisms in marine environments are expected to modify their behavior in response to external stressors. Among environmental drivers of animal movement are long-term climatic indices influencing organism distribution and short-term meteorological events anticipated to alter acute movement behavior. However, few studies exist documenting the response of vagile...
Three-dimensional geologic map of the southern Carson Sink, Nevada, including the Fallon FORGE area
Drew L. Siler, James E. Faulds, Jonathan M.G. Glen, Nicholas H. Hinz, Jeffrey B. Witter, Kelly Blake, John Queen, Mark Fortuna
2019, Scientific Investigations Map 3437
The three-dimensional (3–D) geologic map characterizes the subsurface in the southern Carson Sink region. We created the 3–D map by integrating the results from seismic-reflection, potential-field-geophysical, and lithologic well-logging investigations completed in and around the Fallon FORGE site as part of the U.S. Department of Energy Frontier Observatory for Research...
Oyster reefs in northern Gulf of Mexico estuaries harbor diverse fish and decapod crustacean assemblages: A meta-synthesis
Megan K. LaPeyre, Danielle Aguilar Marshall, Lindsay Miller, Austin T. Humphries
2019, Frontiers in Marine Science (6)
Oyster reefs provide habitat for numerous fish and decapod crustacean species that mediate ecosystem functioning and support vibrant fisheries. Recent focus on the restoration of eastern oyster (Crassostrea virginica) reefs stems from this role as a critical ecosystem engineer. Within the shallow estuaries of the northern Gulf of Mexico (nGoM), the...
Lead exposure of red-shouldered hawks during the breeding season in the central Appalachians, USA
Todd E. Katzner
2019, Bulletin of Environmental Contamination and Toxicology (103) 783-788
Lead is toxic to humans and wildlife. Most studies of lead exposure of raptors focus on the winter, non-breeding season when they scavenge heavily. We evaluated blood lead concentrations (BLCs) of red-shouldered hawks (Buteo lineatus) during the non-scavenging season in the eastern United States. BLCs of 53 of 70 hawks...
Groundwater and surface-water resources near Red Fleet Reservoir, Uintah County, Utah
Thomas M. Marston, John E. Solder, Katherine K. Jones
2019, Scientific Investigations Report 2019-5101
Red Fleet Reservoir in Uintah County, Utah, is an approximately 26,000 acre-foot (acre-ft) on-channel reservoir in the Big Brush Creek drainage on the south slopes of the Uinta Mountains. It is operated primarily for irrigation needs while providing a supplemental drinking-water supply to the Vernal, Utah area. Red Fleet Reservoir,...
Assessing plant production responses to climate across water-limited regions using Google Earth Engine
Erin L. Bunting, Seth M. Munson, John B. Bradford
2019, Remote Sensing of Environment (233) 1-15
(Munson) Climate variability and change acting at broad scales can lead to divergent changes in plant production at local scales. Quantifying how production responds to variation in climate at local scales is essential to understand underlying ecological processes and inform land management decision-making, but has historically been limited in spatiotemporal...
Differential effects of temperature and salinity on growth and mortality of oysters (Crassostrea virginica) in Barataria Bay and Breton Sound, Louisiana
T. Sehlinger, M.R. Lowe, Megan K. LaPeyre, T.M. Soniat
2019, Journal of Shellfish Research (38) 317-326
Temperature and salinity and their interaction exert a major control on the life cycle of the eastern oyster (Crassostrea virginica), affecting reproduction, development, growth, and mortality. Quantifying specific temperature and salinity relationships on oyster growth and mortality has however proven difficult, with data suggesting potentially region-specific responses. Legacy and recent...
A Generalized Additive Model approach to evaluating water quality: Chesapeake Bay Case Study
Rebecca Murphy, Elgin Perry, Jon Harcum, Jennifer L. Keisman
2019, Environmental Modelling & Software (118)
Nutrient-reduction efforts have been undertaken in recent decades to mitigate the impacts of eutrophication in coastal and estuarine systems worldwide. To track progress in response to one of these efforts we use Generalized Additive Models (GAMs) to evaluate a diverse suite of water quality constituents over a 32-year period in...
Dextral, normal, and sinistral faulting across the eastern California shear zone-Mina deflection transition, California-Nevada
Kevin DeLano, Jeffrey Lee, Rachelle Roper, Andrew T. Calvert
2019, Geosphere (15) 1206-1239
Strike-slip faults commonly include extensional and contractional bends and stepovers, whereas rotational stepovers are less common. The Volcanic Tableland, Black Mountain, and River Spring areas (California and Nevada, USA) (hereafter referred to as the VBR region) straddle the transition from the dominantly NW-striking dextral faults that define the northwestern part...
Insights into post-Miocene uplift of the western margin of the Colorado Plateau from the stratigraphic record of the lower Colorado River
Ryan S. Crow, Keith A. Howard, L. Sue Beard, Phil Pearthree, Kyle House, Karl Karlstrom, Lisa Peters, William C. McIntosh, Colleen Cassidy, Tracey J. Felger, Debra Block
2019, Geosphere (15) 1826-1845
The spatial and temporal distribution of Pliocene to Holocene Colorado River deposits (southwestern USA and northwestern Mexico) form a primary data set that records the evolution of a continental-scale river system and helps to delineate and quantify the magnitude of regional deformation. We focus in particular on the age and...
Detrital zircon geochronology along a structural transect across the Kahiltna assemblage in the western Alaska Range: Implications for emplacement of the Alexander-Wrangellia-Peninsular terrane against North America
Stephen E. Box, Susan M. Karl, James V. Jones III, Dwight Bradley, Peter J. Haeussler, Paul B. O’Sullivan
2019, Geosphere (15) 1774-1808
The Kahiltna assemblage in the western Alaska Range consists of deformed Upper Jurassic and Cretaceous clastic strata that lie between the Alexander-Wrangellia-Peninsular (AWP) terrane to the south, and the Farewell and other peri-cratonic terranes to the north. Differences in detrital zircon populations and sandstone petrography allow geographic separation of the...
Oyster reefs in northern Gulf of Mexico estuaries harbor diverse fish and decapod crustacean assemblages: A meta-synthesis
Megan K. LaPeyre, D. A. Marshall, L. S. Miller, A. T. Humphries
2019, Frontiers in Marine Science (6)
Oyster reefs provide habitat for numerous fish and decapod crustacean species that mediate ecosystem functioning and support vibrant fisheries. Recent focus on the restoration of eastern oyster (Crassostrea virginica) reefs stems from this role as a critical ecosystem engineer. Within the shallow estuaries of the northern Gulf of Mexico (nGoM), the...
Holocene Sea-Level Variability from Chesapeake Bay Tidal Marshes
Thomas M. Cronin, Megan K. Clevenger, Neil E. Tibert, Tammy Prescott, Michael Toomey, J. Bradford Hubeny, Mark B. Abbott, Julia Seidenstein, Hannah Whitworth, Samuel R Fisher, Nick Wondolowski, Anna Ruefer
2019, Holocene (29) 1979-1693
We reconstructed the last 10,000 years of Holocene relative sea-level rise (RSLR) from sediment core records in near Chesapeake Bay, eastern U.S.A., including new marsh records from the Potomac and Rappahannock Rivers, Virginia. Results show mean RSLR rates of 2.6 mm yr-1 from 10 to 8 kilo-annum (ka) due...
Application of a regional climate model to assess changes in the climatology of the Eastern US and Cuba associated with historic landcover change
Steven W. Hostetler, R Reker, Jay R. Alder, Thomas Loveland, Debra A. Willard, Christopher E. Bernhardt, Eric T. Sundquist, Renee L. Thompson
2019, JGR Atmospheres (124) 11722-11745
We examine the annual, seasonal, monthly, and diurnal climate responses to the land use change (LUC) in eastern United States and Cuba during four epochs (1650, 1850, 1920, and 1992) with ensemble simulations conducted with the RegCM4 regional climate model that includes the Biosphere Atmosphere Transfer Scheme (BATS1e) surface physics...
Dynamically triggered changes of plate interface coupling in Southern Cascadia
Kathryn Z. Materna, Noel Bartlow, Aaron Wech, Charles Williams, Roland Burgmann
2019, Geophysical Research Letters (46) 12890-12899
In Southern Cascadia, precise Global Navigation Satellite System (GNSS) measurements spanning about 15 years reveal steady deformation due to locking on the Cascadia megathrust punctuated by transient deformation from large earthquakes and episodic tremor and slip events. Near the Mendocino Triple Junction, however, we recognize several abrupt GNSS velocity changes...
Assessing the feasibility of satellite-based thresholds for hydrologically driven landsliding
Matthew A. Thomas, Brian D. Collins, Benjamin B. Mirus
2019, Water Resources Research (55) 9006-9023
Elevated soil moisture and heavy precipitation contribute to landslides worldwide. These environmental variables are now being resolved with satellites at spatiotemporal scales that could offer new perspectives on the development of landslide warning systems. However, the application of these data to hydro-meteorological thresholds (which account for antecedent soil moisture and...
Managing sand along the Colorado River to protect cultural sites downstream of Glen Canyon Dam
Terri Cook, Amy E. East, Helen Fairley, Joel B. Sankey
2019, Fact Sheet 2019-3054
The construction of Glen Canyon Dam in northern Arizona has greatly reduced the supply of sand to the Colorado River corridor through Glen Canyon National Recreation Area and Grand Canyon National Park, hereafter referred to as Glen Canyon and Grand Canyon, respectively. This deficit has strongly affected the natural sediment...
