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Research ArticleResearch Section

Quantifying relative contributions from sediment sources in Conservation Effects Assessment Project watersheds

C.G. Wilson, R.A. Kuhnle, D.D. Bosch, J.L. Steiner, P.J. Starks, M.D. Tomer and G.V. Wilson
Journal of Soil and Water Conservation November 2008, 63 (6) 523-532; DOI: https://doi.org/10.2489/jswc.63.6.523
C.G. Wilson
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R.A. Kuhnle
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D.D. Bosch
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J.L. Steiner
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P.J. Starks
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M.D. Tomer
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G.V. Wilson
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Abstract

A technique using the relationship between the naturally occurring radionuclide tracers, 7Be and 210Pbxs, was used to differentiate eroded surface soils and channel-derived sediments in the fine suspended sediment loads of runoff events in five Conservation Effects Assessment Project watersheds. A simple two end-member mixing model was used to determine the relative contribution from each source. Results suggest that eroded surface soils were more prevalent in the suspended load early in a runoff event, but channel contributions dominated the suspended load at later stages. The method proved useful for multiple sites due to a constant proportion of the atmospheric deliveries of the two radionuclides globally. Use of only two radionuclide tracers simplifies the differentiation of sediment sources within a watershed but limits precision.

Footnotes

  • Christopher G. Wilson is a post-doctoral researcher with IIHR-Hydroscience and Engineering, University of Iowa, Iowa City, Iowa. Roger A. Kuhnle is a research hydraulic engineer at the National Sedimentation Lab, USDA Agricultural Research Service (ARS), Oxford, Mississippi. David D. Bosch is a research hydraulic engineer at the Southeast Watershed Research Lab, USDA ARS, Tifton, Georgia. Jean L. Steiner is a supervisory soil scientist and Pat J. Starks is a soil scientist at the Grazinglands Research Lab, USDA ARS, El Reno, Oklahoma. Mark D. Tomer is a soil scientist at the National Soil Tilth Lab, USDA ARS, Ames, Iowa. Glenn V. Wilson is a research hydrologist at the National Sedimentation Lab, USDA ARS.

  • © 2008 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 63 (6)
Journal of Soil and Water Conservation
Vol. 63, Issue 6
November/December 2008
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Quantifying relative contributions from sediment sources in Conservation Effects Assessment Project watersheds
C.G. Wilson, R.A. Kuhnle, D.D. Bosch, J.L. Steiner, P.J. Starks, M.D. Tomer, G.V. Wilson
Journal of Soil and Water Conservation Nov 2008, 63 (6) 523-532; DOI: 10.2489/jswc.63.6.523

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Quantifying relative contributions from sediment sources in Conservation Effects Assessment Project watersheds
C.G. Wilson, R.A. Kuhnle, D.D. Bosch, J.L. Steiner, P.J. Starks, M.D. Tomer, G.V. Wilson
Journal of Soil and Water Conservation Nov 2008, 63 (6) 523-532; DOI: 10.2489/jswc.63.6.523
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