Stewart Rounds (Former Employee)
Science and Products
Filter Total Items: 67
Phosphorus and E. coli and their relation to selected constituents during storm runoff conditions in Fanno Creek, Oregon, 1998-99 Phosphorus and E. coli and their relation to selected constituents during storm runoff conditions in Fanno Creek, Oregon, 1998-99
No abstract available.
Authors
Chauncey W. Anderson, Stewart A. Rounds
Modeling water quality in the Tualatin River, Oregon, 1991-1997 Modeling water quality in the Tualatin River, Oregon, 1991-1997
The calibration of a model of flow, temperature, and water quality in the Tualatin River, Oregon, originally calibrated for the summers of 1991 through 1993, was extended to the summers of 1991 through 1997. The model is now calibrated for a total period of 42 months during the May through October periods of 7 hydrologically distinct years. Based on a modified version of the U.S. Army...
Authors
Stewart A. Rounds, Tamara M. Wood
Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93 Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93
In the 1980s significant nutrient-related water-quality problems that impacted beneficial uses were identified in the Tualatin River during the low-flow summer months, defined as .May 1 to October 31. Unsightly algal blooms resulted in fluctuations in oxygen concentrations and pH conditions; reduction of phosphorus concentrations was determined to the effective control mechanism for...
Authors
Valerie J. Kelly, Dennis D. Lynch, Stewart A. Rounds
Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93 Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93
Sources and transport for phosphorous and nitrogen to the Tualatin River, Oregon, were characterized for summer (May through October) low-flow conditions during 1991, 1992, and 1993. Mass balances for water and chemical constituents, which were generated for the main-stem river, provide important context for nutrient-reduction efforts in the basin.
Authors
Valerie J. Kelly, Dennis D. Lynch, Stewart A. Rounds
Modeling discharge, temperature, and water quality in the Tualatin River, Oregon Modeling discharge, temperature, and water quality in the Tualatin River, Oregon
The discharge, water temperature, and water quality of the Tualatin River in northwestern Oregon was simulated with CE-QUAL-W2, a two-dimensional, laterally averaged model developed by the U.S. Army Corps of Engineers. The model was calibrated for May through October periods of 1991, 1992, and 1993. Nine hypothetical scenarios were tested with the model to provide insight for river...
Authors
Stewart A. Rounds, Tamara M. Wood, Dennis D. Lynch
Sediment oxygen demand in the Tualatin River basin, Oregon, 1992-96 Sediment oxygen demand in the Tualatin River basin, Oregon, 1992-96
Sediment oxygen demand (SOD) rates were measured by U.S. Geological Survey (USGS) personnel at 20 stream sites in the Tualatin River Basin from 1992 through 1996 as part of an investigation into the sources and sinks of dissolved oxygen in the Tualatin River. During the low-flow summer periods of 1992 through 1994, 97 measurements were collected at 9 sites on the main stem of the river...
Authors
Stewart Rounds, M. C. Doyle
Occurrence of selected trace elements and organic compounds and their relation to land use in the Willamette River basin, Oregon, 1992-94 Occurrence of selected trace elements and organic compounds and their relation to land use in the Willamette River basin, Oregon, 1992-94
Between 1992 and 1994, the U.S.Geological Survey conducted a study of trace elements and organic compounds in the Willamette River Basin, Oregon, as part of the Willamette River Basin Water Quality Study. Low-level analyses were performed for trace elements, volatile organic compounds, organochlorine compounds, and pesticides. Overall, 94 water samples were collected from 40 sites...
Authors
Chauncey W. Anderson, Frank A. Rinella, Stewart A. Rounds
Non-USGS Publications**
Rounds, S.A. and Pankow, J.F., 1993, Determination of selected chlorinated benzenes in water by purging directly to a capillary column with whole column cryotrapping and electron capture detection: J. Chromatogr., v. 629, p. 321-327. https://doi.org/10.1016/0021-9673(93)87046-O
Rounds, S.A., Tiffany, B.A., and Pankow, J.F., 1993, Description of gas/particle sorption kinetics with an intraparticle diffusion model: desorption experiments: Environ. Sci. Technol., v. 27, p. 366-377. https://doi.org/10.1021/es00039a018
Rounds, S.A. and Pankow, J.F., 1990, Application of a radial diffusion model to describe gas/particle sorption kinetics: Environ. Sci. Technol., v. 24, p. 1378-1386. https://doi.org/10.1021/es00079a012
Bonn, B.A. and Rounds, S.A., 1990, DREAM - Analytical Groundwater Flow Programs: Chelsea, MI, Lewis Publishers, 109 p. https://www.taylorfrancis.com/books/mono/10.1201/9781003069898/dream-bernadine-bonn-stewart-rounds
Larson, R.A., and Rounds, S.A., 1987, Photochemistry in Aqueous Surface Layers: 1-Naphthol: chap. 15, pp 206-214 in Photochemistry of Environmental Aquatic Systems, Zika, R.G. and Cooper, W.J., editors, ACS Symposium Series volume 327, American Chemical Society. https://pubs.acs.org/doi/pdf/10.1021/bk-1987-0327.ch015
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 67
Phosphorus and E. coli and their relation to selected constituents during storm runoff conditions in Fanno Creek, Oregon, 1998-99 Phosphorus and E. coli and their relation to selected constituents during storm runoff conditions in Fanno Creek, Oregon, 1998-99
No abstract available.
Authors
Chauncey W. Anderson, Stewart A. Rounds
Modeling water quality in the Tualatin River, Oregon, 1991-1997 Modeling water quality in the Tualatin River, Oregon, 1991-1997
The calibration of a model of flow, temperature, and water quality in the Tualatin River, Oregon, originally calibrated for the summers of 1991 through 1993, was extended to the summers of 1991 through 1997. The model is now calibrated for a total period of 42 months during the May through October periods of 7 hydrologically distinct years. Based on a modified version of the U.S. Army...
Authors
Stewart A. Rounds, Tamara M. Wood
Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93 Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93
In the 1980s significant nutrient-related water-quality problems that impacted beneficial uses were identified in the Tualatin River during the low-flow summer months, defined as .May 1 to October 31. Unsightly algal blooms resulted in fluctuations in oxygen concentrations and pH conditions; reduction of phosphorus concentrations was determined to the effective control mechanism for...
Authors
Valerie J. Kelly, Dennis D. Lynch, Stewart A. Rounds
Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93 Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93
Sources and transport for phosphorous and nitrogen to the Tualatin River, Oregon, were characterized for summer (May through October) low-flow conditions during 1991, 1992, and 1993. Mass balances for water and chemical constituents, which were generated for the main-stem river, provide important context for nutrient-reduction efforts in the basin.
Authors
Valerie J. Kelly, Dennis D. Lynch, Stewart A. Rounds
Modeling discharge, temperature, and water quality in the Tualatin River, Oregon Modeling discharge, temperature, and water quality in the Tualatin River, Oregon
The discharge, water temperature, and water quality of the Tualatin River in northwestern Oregon was simulated with CE-QUAL-W2, a two-dimensional, laterally averaged model developed by the U.S. Army Corps of Engineers. The model was calibrated for May through October periods of 1991, 1992, and 1993. Nine hypothetical scenarios were tested with the model to provide insight for river...
Authors
Stewart A. Rounds, Tamara M. Wood, Dennis D. Lynch
Sediment oxygen demand in the Tualatin River basin, Oregon, 1992-96 Sediment oxygen demand in the Tualatin River basin, Oregon, 1992-96
Sediment oxygen demand (SOD) rates were measured by U.S. Geological Survey (USGS) personnel at 20 stream sites in the Tualatin River Basin from 1992 through 1996 as part of an investigation into the sources and sinks of dissolved oxygen in the Tualatin River. During the low-flow summer periods of 1992 through 1994, 97 measurements were collected at 9 sites on the main stem of the river...
Authors
Stewart Rounds, M. C. Doyle
Occurrence of selected trace elements and organic compounds and their relation to land use in the Willamette River basin, Oregon, 1992-94 Occurrence of selected trace elements and organic compounds and their relation to land use in the Willamette River basin, Oregon, 1992-94
Between 1992 and 1994, the U.S.Geological Survey conducted a study of trace elements and organic compounds in the Willamette River Basin, Oregon, as part of the Willamette River Basin Water Quality Study. Low-level analyses were performed for trace elements, volatile organic compounds, organochlorine compounds, and pesticides. Overall, 94 water samples were collected from 40 sites...
Authors
Chauncey W. Anderson, Frank A. Rinella, Stewart A. Rounds
Non-USGS Publications**
Rounds, S.A. and Pankow, J.F., 1993, Determination of selected chlorinated benzenes in water by purging directly to a capillary column with whole column cryotrapping and electron capture detection: J. Chromatogr., v. 629, p. 321-327. https://doi.org/10.1016/0021-9673(93)87046-O
Rounds, S.A., Tiffany, B.A., and Pankow, J.F., 1993, Description of gas/particle sorption kinetics with an intraparticle diffusion model: desorption experiments: Environ. Sci. Technol., v. 27, p. 366-377. https://doi.org/10.1021/es00039a018
Rounds, S.A. and Pankow, J.F., 1990, Application of a radial diffusion model to describe gas/particle sorption kinetics: Environ. Sci. Technol., v. 24, p. 1378-1386. https://doi.org/10.1021/es00079a012
Bonn, B.A. and Rounds, S.A., 1990, DREAM - Analytical Groundwater Flow Programs: Chelsea, MI, Lewis Publishers, 109 p. https://www.taylorfrancis.com/books/mono/10.1201/9781003069898/dream-bernadine-bonn-stewart-rounds
Larson, R.A., and Rounds, S.A., 1987, Photochemistry in Aqueous Surface Layers: 1-Naphthol: chap. 15, pp 206-214 in Photochemistry of Environmental Aquatic Systems, Zika, R.G. and Cooper, W.J., editors, ACS Symposium Series volume 327, American Chemical Society. https://pubs.acs.org/doi/pdf/10.1021/bk-1987-0327.ch015
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.