Toxic Substances Hydrology Program

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GeoHEALTH-USGS Newsletter

The GeoHEALTH-USGS Newsletter provides information on new USGS science activities related to safeguarding the health of fish, wildlife, domesticated animals, livestock, and people from environmental exposures to contaminants and pathogens.

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Featured Science Activities

Featured Science Activities

Lean about our Featured Science Activities through our pages that highlight recience studies, publications, and results.

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Filter Total Items: 3,105
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Year Published: 1993

Modelling within the stream-catchment continuum

No abstract available.

Jakeman, A.J.; Beck, M.; McAleer, Ryan J.; Bencala, Kenneth E.; Duff, John H.; Harvey, Judson W.; Jackman, A.P.; Triska, F.J.

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Year Published: 1993

Aspects of the biogeochemistry of methane in Mono Lake and the Mono Basin of California, USA

Above-ambient levels of methane and higher hydrocarbons were detected in the atmosphere of the Mono Basin. These gases emanated from several different sources, including natural gas seeps (thermogenic and biogenic), and methanogenic activity in sediments. Seeps were distributed over nearly 33% of the lake bottom and were also present in the...

Oremland, Ronald S.; Miller, Laurence G.; Colbertson, Charles; Robinson, S.W.; Smith, Richard L.; Lovley, D.R.; Whiticar, Michael J.; King, G.; Kiene, Ronald P.; Iversen, Niels ; Sargent, Melinda
Oremland, R.S., Miller, L.G., Culbertson, C.W., Robinson, S., Smith, R.L., Lovley, D., Whiticar, M.J., and King, G.M., 1993, Aspects of the biogeochemistry of methane in Mono Lake and the Mono Basin of California, USA, in Oremland, R.S., ed., Biogeochemistry of global change--radiative trace gases: New York, Chapman and Hall, p. 704-744.

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Year Published: 1993

Scales in chemical hydrogeology: A historical perspective

No abstract available. 

Alley, William; Back, W.; Baedecker, Mary Jo; Wood, W.

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Year Published: 1993

A brief history of the American radium industry and its ties to the scientific community of its early twentieth century

Federally funded remedial action projects are presently underway in New Jersey and Colorado at sites containing 226Ra and other radionuclides from radium-uranium ore extraction plants that operated during the early twentieth century. They are but the latest chapter in the story of an American industry that emerged and perished in the span of three...

Landa, E.R.
A brief history of the American radium industry and its ties to the scientific community of its early twentieth century; 1993; Conference Paper; Environment International; Landa, E. R.

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Year Published: 1993

A finite-volume Eulerian-Lagrangian Localized Adjoint Method for solution of the advection-dispersion equation

A new mass-conservative method for solution of the one-dimensional advection-dispersion equation is derived and discussed. Test results demonstrate that the finite-volume Eulerian-Lagrangian localized adjoint method (FVELLAM) outperforms standard finite-difference methods, in terms of accuracy and efficiency, for solute transport problems that are...

Healy, R.W.; Russell, T.F.
A finite-volume Eulerian-Lagrangian localized adjoint method for solution of the advection-dispersion equation; 1993; Article; Journal; Water Resources Research; Healy, R. W.; Russell, T. F.

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Year Published: 1993

A perspective on stream-catchment connections

Ecological study of the hyporheic zone is leading to recognition of a need for additional hydrologic understanding. Some of this understanding can be obtained by viewing the hyporheic zone as a succession of isolated boxes adjacent to the stream. Further understanding, particularly relevant to catchment-scale ecology, may come from studies...

Bencala, Kenneth E.

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Year Published: 1993

An efficient numerical solution of the transient storage equations for solute transport in small streams

Several investigators have proposed solute transport models that incorporate the effects of transient storage. Transient storage occurs in small streams when portions of the transported solute become isolated in zones of water that are immobile relative to water in the main channel (e.g., pools, gravel beds). Transient storage is modeled by adding...

Runkel, Robert L.; Chapra, Steven C.

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Year Published: 1993

Analysis of flow in an observation well intersecting a single fracture

A semi-analytical model is developed to determine transmissivity and storativity from the interpretation of transient flow in an observation well due to pumping in a source well where the two wells are connected by a single fracture. Flow rate can be determined using a heat-pulse flowmeter located above the intersection of the fracture in the...

Lapcevic, P.A.; Novakowski, K.S.; Paillet, Frederick L.
Analysis of flow in an observation well intersecting a single fracture; 1993; Article; Journal; Journal of Hydrology; Lapcevic, P. A.; Novakowski, K. S.; Paillet, F. L.

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Year Published: 1993

Application of borehole geophysics in defining the wellhead protection area for a fractured crystalline bedrock aquifer

Wellbore geophysical techniques were used to characterize fractures and flow in a bedrock aquifer at a site near Blackwater Brook in Dover, New Hampshire. The primary focus ofthis study was the development of a model to assist in evaluating the area surrounding a planned water supply well where contaminants introduced at the land surface might be...

Vernon, J.H.; Paillet, F.L.; Pedler, W.H.; Griswold, W.J.

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Year Published: 1993

Application of mixed-mode, solid-phase extraction in environmental and clinical chemistry. Combining hydrogen-bonding, cation-exchange and Van der Waals interactions

Silica- and styrene-divinylbenzene-based mixed-mode resins that contain C8, C18 and sulphonated cation-exchange groups were compared for their efficiency in isolation of neutral triazine compounds from water and of the basic drug, benzoylecgonine, from urine. The triazine compounds were isolated by a combination of Van der Waals and hydrogen-...

Mills, M.S.; Thurman, E.M.; Pedersen, M.J.
Application of mixed-mode, solid-phase extraction in environmental and clinical chemistry. Combining hydrogen-bonding, cation-exchange and Van der Waals interactions; 1993; Conference Paper; Journal of Chromatography; Mills, M. S.; Thurman, E. M.; Pedersen, M. J.

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Year Published: 1993

Assessing the effect of pesticides in agricultural runoff on aquatic life in the Sangamon River near Monticello, Illinois

Stream-water samples collected from a midwest stream, following a thunderstorm during May 1991 were toxic to water fleas (Ceriodaphnia dubia), but not fathead minnows (Pimephales promelas), or a bacterium (Photobacterium phosphoreum) or green alga (Selenastrum capricornutum). It was unlikely that the toxicity to the water fleas was caused by...

Olem, H.; Coupe, R.H.; Henebry, M.S.; Branham, M.R.
Assessing the effect of pesticides in agricultural runoff on aquatic life in the Sangamon River near Monticello, Illinois; 1993; Conference Paper; Water Science and Technology; Coupe, R. H.; Henebry, M. S.; Branham, M. R.

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Year Published: 1993

Atrazine degradation in a small stream in Iowa

A study was conducted during 1990 through an 11.2-km reach of Roberts Creek in northeastern Iowa to determine the fate of atrazine in a surface water environment Water samples were collected at ~1-month intervals from April through November during stable low to medium flow conditions and analyzed for atrazine and two of its initial biotic...

Kolpin, D.W.; Kalkhoff, S.J.
Atrazine degradation in a small stream in Iowa; 1993; Article; Journal; Environmental Science and Technology; Kolpin, D. W.; Kalkhoff, S. J.