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A hillslope version of the revised morgan,morgan and finney water erosion model

International Soil and Water Conservation Research 2021年第3期9卷 319-332页

作者： Geert Sterk Department of Physical Geography Utrecht UniversityPO Box 80.115NL-3508 TCUtrechtthe Netherlands

The revised morgan,morgan and finney(rMMF)water erosion model calculates annual surface runoff and soil loss from field-sized *** original version of the rMMF is neither suited to calculate water erosion along irregular hillslopes,nor capable to allow infiltration of once generated surface runoff at places where the runoff speed slows down,and infiltration could occur under natural *** aim of this article is to describe a new hillslope version of the rMMF model that allows infiltration of surface runoff,and to show examples of soil erosion modelling along real and hypothetical *** new hillslope version(hMMF)splits the entire hillslope into a number of sections that have individual properties,such as slope angle,slope length,soil properties and vegetation *** surface runoff along the slope is calculated by summing the volume of surface runoff generated in a particular section with the surface runoff coming from the immediate upsiope *** related sediment transport is calculated for each section using the calculated detachment for the section,the sediment coming from the upsiope section and the transport capacity.A new variable is introduced to account for infiltration of surface runoff and allows simulating the effects of soil and water conservation structures on water *** model was tested using measured data from plots in Africa,Asia,the US and Europe,as well as for a surveyed hillslope in Tunisia(Barbara watershed).Overall,the performance of the hMMF was reasonable for surface runoff and poor for soil loss when recommended input variable values are *** of the model resulted in a good performance,which shows the capability of the hMMF model to reproduce measured surface runoff and erosion *** addition,realistic water erosion patterns on hillslopes with soil and water conservation can be simulated.

关键词： Water erosion modelling morgan-morgan-finney model Hillslope Surface runoff Sediment transport Soil loss Soil and water conservation

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