Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 4047
Groundwater hydrology--coastal flow
How groundwater flow varies when long-term external conditions change is little documented. Geochemical evidence shows that sea-level rise at the end of the last glacial period led to a shift in the flow patterns of coastal groundwater beneath Florida.
Authors
Ward E. Sanford
Current challenges using models to forecast seawater intrusion: lessons from the Eastern Shore of Virginia, USA
A three-dimensional model of the aquifer system of the Eastern Shore of Virginia, USA was calibrated to reproduce historical water levels and forecast the potential for saltwater intrusion. Future scenarios were simulated with two pumping schemes to predict potential areas of saltwater intrusion. Simulations suggest that only a few wells would be threatened with detectable salinity increases befor
Authors
Ward E. Sanford, Jason P. Pope
Testing mixing models of old and young groundwater in a tropical lowland rain forest with environmental tracers
We tested three models of mixing between old interbasin groundwater flow (IGF) and young, locally derived groundwater in a lowland rain forest in Costa Rica using a large suite of environmental tracers. We focus on the young fraction of water using the transient tracers CFC‐11, CFC‐12, CFC‐113, SF6, 3H, and bomb 14C. We measured 3He, but 3H/3He dating is generally problematic due to the presence o
Authors
D. Kip Solomon, David P. Genereux, Niel Plummer, Eurybiades Busenberg
Influence of hummocks and emergent vegetation on hydraulic performance in a surface flow wastewater treatment wetland
A series of tracer experiments were conducted biannually at the start and end of the vegetation growing season in a surface flow wastewater treatment wetland located near Phoenix, AZ. Tracer experiments were conducted prior to and following reconfiguration and replanting of a 1.2 ha treatment wetland from its original design of alternating shallow and deep zones to incorporate hummocks (shallow pl
Authors
Steffanie H. Keefe, Joan S. Daniels, Robert L. Runkel, Roland D. Wass, Eric A. Stiles, Larry B. Barber
Chemical fractionation of Cu and Zn in stormwater, roadway dust and stormwater pond sediments
This study evaluated the chemical fractionation of Cu and Zn from source to deposition in a stormwater system. Cu and Zn concentrations and chemical fractionation were determined for roadway dust, roadway runoff and pond sediments. Stormwater Cu and Zn concentrations were used to generate cumulative frequency distributions to characterize potential exposure to pond-dwelling organisms. Dissolved st
Authors
Kimberly M. Camponelli, Steven M. Lev, Joel W. Snodgrass, Edward R. Landa, Ryan E. Casey
Water-quality, bed-sediment, and biological data (October 2008 through September 2009) and statistical summaries of long-term data for streams in the Clark Fork basin, Montana
Water, bed sediment, and biota were sampled in streams from Butte to near Missoula, Montana, as part of a long-term monitoring program in the upper Clark Fork basin; additional water samples were collected in the Clark Fork basin from sites near Missoula downstream to near the confluence of the Clark Fork and Flathead River as part of a supplemental sampling program. The sampling programs were con
Authors
Kent A. Dodge, Michelle I. Hornberger, Jessica Dyke
Intraperitoneal injections as a possible means of generating varied levels of methylmercury in the eggs of birds in field studies
The ideal study of the effects of methylmercury on the reproductive success of a species of bird would be one in which eggs contained mercury concentrations ranging from controls to very heavily contaminated, all at the same site. Such a study cannot be realized at a mercury contaminated area or under laboratory conditions, but could be achieved by introducing methylmercury into breeding females a
Authors
Gary Heinz, David J. Hoffman, Jon D. Klimstra, Katherine R. Stebbins
Mercury-contaminated hydraulic mining debris in San Francisco Bay
The hydraulic gold-mining process used during the California Gold Rush and in many developing countries today contributes enormous amounts of sediment to rivers and streams. Commonly, accompanying this sediment are contaminants such as elemental mercury and cyanide used in the gold extraction process. We show that some of the mercurycontaminated sediment created by hydraulic gold mining in the Sie
Authors
Robin M. Bouse, Christopher C. Fuller, Samuel N. Luoma, Michelle I. Hornberger, Bruce E. Jaffe, Richard E. Smith
Use and environmental occurrence of pharmaceuticals in freestall dairy farms with manured forage fields
Environmental releases of antibiotics from concentrated animal feeding operations (CAFOs) are of increasing regulatory concern. This study investigates the use and occurrence of antibiotics in dairy CAFOs and their potential transport into first-encountered groundwater. On two dairies we conducted four seasonal sampling campaigns, each across 13 animal production and waste management systems and a
Authors
Naoko Watanabe, Brian A. Bergamaschi, Keith A. Loftin, Michael T. Meyer, Thomas Harter
Biogeochemical processes in an urban, restored wetland of San Francisco Bay, California, 2007-2009: Methods and data for plant, sediment and water parameters
The restoration of 18 acres of historic tidal marsh at Crissy Field has had great success in terms of public outreach and visibility, but less success in terms of revegetated marsh sustainability. Native cordgrass (Spartina foliosa) has experienced dieback and has failed to recolonize following extended flooding events during unintended periodic closures of its inlet channel, which inhibits daily
Authors
Lisamarie Windham-Myers, Mark C. Marvin-DiPasquale, Jennifer L. Agee, Le H. Kieu, Evangelos Kakouros, Li H. Erikson, Kristen Ward
Microbial and geochemical investigations of dissolved organic carbon and microbial ecology of native waters from the Biscayne and Upper Floridan Aquifers
Groundwater resources in the United States are under ever-increasing demands for potable, irrigation, and recreational uses. Additionally, aquifer systems are being used or targeted for use as storage areas for treated surface waters and (or) groundwaters via injection (for example, aquifer storage and recovery). To date, the influence that the nutrients, including carbon, in the injected water ha
Authors
John T. Lisle, Ron W. Harvey, George R. Aiken, David W. Metge
Phytoestrogens and mycotoxins in Iowa streams: An examination of underinvestigated compounds in agricultural basins
This study provides the first broad-scale investigation on the spatial and temporal occurrence of phytoestrogens and mycotoxins in streams in the United States. Fifteen stream sites across Iowa were sampled five times throughout the 2008 growing season to capture a range of climatic and crop-growth conditions. Basin size upstream from sampling sites ranged from 7 km2 to >836,000 km2 Atrazine (herb
Authors
Dana W. Kolpin, Corinne C. Hoerger, Michael T. Meyer, Felix E. Wettstein, Laura E. Hubbard, Thomas D. Bucheli