Rainfall runoff test on bare soil with different slope gradient and soil moisture content
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Abstract:
Antecedent soil moisture content and slope gradient are significant influential factors for rainfall-runoff (RR) process. In order to study the RR mechanism of semi-arid region in the North China, artificial RR simulation test was carried out in the condition of different slope gradient and antecedent soil moisture content. According to the results: (1) In the whole RR process, the overland flow increased with the increase of antecedent soil moisture and slope, and the relationship between cumulative runoff and rainfall duration complied with a linear function. (2) Soil infiltration rate and runoff lag time decreased with the increase of antecedent soil moisture content and slope, and the influence of antecedent soil moisture on soil infiltration rate and runoff lag time was more obvious than that of slope. （3）Horton model was better than Kostiakov and Philip model in fitting the relationship between rainfall and infiltration.
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