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Lookup NU author(s): Dr James Bathurst
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Calibration of the rainfall and overland flow erodibility coefficients of a physically based erosion and sediment yield component for the Systeme Hydrologique Europeen (SHE) modeling system is demonstrated using data from 32.54-m2-field rainfall-simulator plots with tilled, tilled-twice, clipped, grazed, and ungrazed land treatments. Good sensitivity to the major classes of treatment is exhibited, but the fine detail of variation for a given land cover is less well represented. This is a result of a lack of quantitative understanding of relevant processes that can be remedied only through detailed process studies. Good simulations of overland flow response were achieved for successive rain applications on wetted soil. Difficulties experienced in simulating overland flow response for dry soil probably resulted from poor definition of the soil hydraulic properties for dry conditions. Tests using other soil erosion data show that laboratory calibration of the erodibility coefficients is unreliable, while sensitivity of the simulated sediment yield to the input flow data indicates the need for accurate flow calibrations.
Author(s): Wicks JM, Bathurst JC, Johnson CW
Publication type: Article
Publication status: Published
Journal: Journal of Irrigation and Drainage Engineering
Year: 1992
Volume: 118
Issue: 5
Pages: 708-723
Print publication date: 01/09/1992
ISSN (print): 0733-9437
ISSN (electronic): 1943-4774
URL: http://dx.doi.org/10.1061/(ASCE)0733-9437(1992)118:5(708)
DOI: 10.1061/(ASCE)0733-9437(1992)118:5(708)
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