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Research ArticleResearch Section

Modeling long-term soil losses on agricultural fields due to ephemeral gully erosion

L.M. Gordon, S.J. Bennett, C.V. Alonso and R.L. Bingner
Journal of Soil and Water Conservation July 2008, 63 (4) 173-181; DOI: https://doi.org/10.2489/jswc.63.4.173
L.M. Gordon
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S.J. Bennett
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C.V. Alonso
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R.L. Bingner
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Abstract

It is now recognized worldwide that soil erosion on agricultural fields due to ephemeral gullies may be greater than those losses attributed to sheet and rill erosion processes. Yet it is not known whether the common practice of repairing or obliterating these gullies during annual tillage activities exacerbates or mitigates soil losses over long time periods. Here, a numerical model is used to demonstrate the potential effects of annual tillage on cumulative soil losses from four geographic regions plagued by ephemeral gullies as compared to no-till conditions where the gullies are free to grow and evolve over time and space. Historical precipitation data and field measurements were compiled for specific sites in Belgium, Mississippi, Iowa, and Georgia, and the model simulated ephemeral gully development and evolution during the growing seasons over a continuous 10-year period. When agricultural fields are not tilled annually, the simulations suggest that gullies attain their maximum dimensions during the first few years in response to several relatively large runoff events. During subsequent runoff events, the gullies no longer erode their channels significantly, and soil losses due to gully erosion decrease markedly. When agricultural fields are tilled annually, the ephemeral gully channels are reactivated, thus causing significant soil losses each year in response to runoff events. Over the 10-year simulation, the modeling results suggest that erosion rates in these four geographic regions can be 250% to 450% greater when gullies are tilled and reactivated annually as opposed to the no-till condition. These results reveal that routine filling of ephemeral gully channels during tillage practices may result in markedly higher rates of soil loss as compared to allowing these gullies to persist on the landscape, demonstrating a further advantage of adopting no-till management practices.

Footnotes

  • Lee M. Gordon is a graduate research assistant and Sean J. Bennett is an associate professor in the Department of Geography, University at Buffalo, Buffalo, New York. Carlos V. Alonso is a supervisory research hydraulic engineer and Ronald L. Bingner is a research agricultural engineer at the National Sedimentation Laboratory, USDA Agricultural Research Service, Oxford, Mississippi.

  • © 2008 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 63 (4)
Journal of Soil and Water Conservation
Vol. 63, Issue 4
July/August 2008
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Modeling long-term soil losses on agricultural fields due to ephemeral gully erosion
L.M. Gordon, S.J. Bennett, C.V. Alonso, R.L. Bingner
Journal of Soil and Water Conservation Jul 2008, 63 (4) 173-181; DOI: 10.2489/jswc.63.4.173

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Modeling long-term soil losses on agricultural fields due to ephemeral gully erosion
L.M. Gordon, S.J. Bennett, C.V. Alonso, R.L. Bingner
Journal of Soil and Water Conservation Jul 2008, 63 (4) 173-181; DOI: 10.2489/jswc.63.4.173
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