Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 3787
EM Induction and DC Resistivity surveys near the Norman, Oklahoma Landfill - text and figures for the WRD Norman web site
No abstract available.
Authors
Jeff E. Lucius, R. J. Bisdorf
Geochemical modeling of water-rock interactions in mining environments
Geochemical modeling is a powerful tool for evaluating geochemical processes in mining environments. Properly constrained and judiciously applied, modeling can provide valuable insights into processes controlling the release, transport, and fate of contaminants in mine drainage. This chapter contains 1) an overview of geochemical modeling, 2) discussion of the types of models and computer programs
Authors
Charles N. Alpers, D. Kirk Nordstrom
Mass balance approach to selenium cycling through the San Joaquin Valley, sources to river to bay
Surface and ground waters of the Central Valley of California (e.g., rivers, dams, off-stream storage reservoirs, pumping facilities, irrigation and drinking water supply canals, agricultural drainage canals) are part of a hydrologic system that makes up a complex ecosystem extending from the riparian wetlands of the Sacramento and San Joaquin Rivers through the San Francisco Bay/Delta Estuary to
Authors
Theresa S. Presser, David Z. Piper
Seasonal variation in metal concentrations in a stream affected by acid mine drainage, St. Kevin Gulch, Colorado
Mining of mineral deposits in the Rocky Mountains has left a legacy of acidic inflows to otherwise pristine upland watersheds. Since 1986, the U.S. Geological Survey has studied physical, chemical, and biological processes that affect the transport and transformation of metals in St. Kevin Gulch, an acidic, metal-rich stream near Leadville, Colorado. Well-known chemical processes have been quantif
Authors
B. A. Kimball
Dissolved nutrient data for the San Francisco Bay Estuary, California, January through November 1995
The U.S. Geological Survey conducted hydrologic investigations in San Francisco Bay between January and November of 1995. Dissolved inorganic plant nutrients, nitrate, nitrite, ammonium, silica, and reactive phosphorus were measured in surface and in near-bottom waters at previously established locations in the channel portions of both northern and southern reaches of the bay, and at shallow water
Authors
Stephen W. Hager, Laurence E. Schemel
Effects of carbon dioxide variations in the unsaturated zone on water chemistry in a glacial-outwash aquifer
The research site at Otis Air Base, Cape Cod, Massachusetts, has been developed for hydrogeological and geochemical studies of sewage-effluent contaminated groundwater since 1982. Research of hydrologic properties, transport, and chemical and biological processes is ongoing, but the origin of background water chemistry has not been determined. The principal geochemical process giving rise to the o
Authors
R. W. Lee
Soil-water movement under natural-site and waste-site conditions: A multiple-year field study in the Mojave Desert, Nevada
Soil-water movement under natural-site and simulated waste-site conditions were compared by monitoring four experimental sites in the Mojave Desert, Nevada, during a 5-year period: one vegetated soil profile, one soil profile where vegetation was removed, and two nonvegetated test trenches. Precipitation ranged from 14 to 162 mm/yr. Temporal changes in water content measured by neutron probe were
Authors
Brian J. Andraski
Historical trends in organochlorine compounds in river basins identified using sediment cores from reservoirs
This study used chemical analyses of dated sediment cores from reservoirs to define historical trends in water quality in the influent river basins. This work applies techniques from paleolimnology to reservoirs, and in the process, highlights differences between sediment-core interpretations for reservoirs and natural lakes. Sediment cores were collected from six reservoirs in the central and sou
Authors
P. C. Van Metre, E. Callender, C. C. Fuller
Geochemical mole-balance modeling with uncertain data
Geochemical mole-balance models are sets of chemical reactions that quantitatively account for changes in the chemical and isotopic composition of water along a flow path. A revised mole-balance formulation that includes an uncertainty term for each chemical and isotopic datum is derived. The revised formulation is comprised of mole-balance equations for each element or element redox state, alkali
Authors
David L. Parkhurst
The design of sampling transects for characterizing water quality in estuaries
The high spatial variability of estuaries poses a challenge for characterizing estuarine water quality. This problem was examined by conducting monthly high-resolution transects for several water quality variables (chlorophyll a, suspended particulate matter and salinity) in San Francisco Bay (California, U.S.A.). Using these data, six different ways of choosing station locations along a transect,
Authors
A.D. Jassby, B.E. Cole, J. E. Cloern
Statistical modeling of agricultural chemical occurrence in midwestern rivers
Agricultural chemicals in surface water may constitute a human health risk or have adverse effects on aquatic life. Recent research on unregulated rivers in the midwestern USA documents that elevated concentrations of herbicides occur for 1-4 months following application in late spring and early summer. In contrast, nitrate concentrations in unregulated rivers are elevated during fall, winter, and
Authors
W.A. Battaglin, D. A. Goolsby