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Sensitivity analysis and calibration of the Modified Universal Soil Loss Equation(MUSLE) for the upper malewa catchment,Kenya

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International Journal of Sediment Research 2013年第3期28卷 368-383页

作者： V.O.ODONGO J.O.ONYANDO B.M.MUTUA P.R.van OEL R.BECHT University of Twente Faculty of Geoinformation Science&Earth Observation(ITC) Egerton University Department of Agricultural Engineering Wageningen University Water Resources Management Group

Simulation models are widely used for studying physical processes such as surface runoff,sediment transport and sediment yield in *** models need case-specific empirical data for parameterization before being applied especially in regions other than the ones they have been *** analysis is usually performed to determine the most influential factors of a model so that they can be prioritized for *** this way uncertainties in model outputs can be reduced *** study evaluates the commonly used modified universal soil loss equation(MUSLE) model used for sediment yield simulation for the case of the upper malewa catchment in *** conceptual factors of the model are assessed relative to the hydrological factors in the ***,the sensitivity of the model to the choice of the objective function in calibration is *** Sobol’ sensitivity analysis method was used for evaluating the degree of sensitivity of the conceptual and hydrological factors for sediment yield simulations using the MUSLE ***-Sutcliffe Efficiency(NSE) and the modified Nash-Sutcliffe Efficiency(NSEm) are used to test the sensitivity of the model to the choice of the objective function and robustness of model performance with sediment data measured from upper malewa catchment,*** results indicate that the conceptual factors are the most sensitive factors of the MUSLE model contributing about 66%of the variability in the output sediment *** variability of sediment yield output was also *** was attributed to interactions of input *** the upper malewa catchment calibration of the MUSLE model indicates that the use of NSEm as an objective function provides stable results,which indicates that the model can satisfactorily be applied for sediment yield simulations.

关键词： MUSLE Sobol’sensitivity analysis Sediment yield Objective function upper malewa catchment

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