AI Article Synopsis
- A finite difference method was used to create a coupled model for surface and subsurface flow, incorporating saturated infiltration theory, the Saint-Venant equation, and Richards equation.
- The model was tested in a lab with slope runoff experiments differing in grade and rain intensity, showing strong agreement between simulated results and actual observations, with relative errors mostly under 10%.
- This model is effective for studying subsurface flow mechanisms and can enhance rainfall-runoff watershed models theoretically.
Article Abstract
A coupled slope surface-subsurface flow model which can be solved by finite difference method was constructed with saturated infiltration theory, Saint-Venant equation, and Richards equation, and a series of slope runoff generation experiments under conditions of different slope grades and rain intensities were conducted in laboratory. The results showed that the simulated and observed processes of surface-subsurface flow accorded well, with the relative errors of peak time, flow duration, peak flow, and gross flow being mostly less than 10%. This precise and practicable model could be used in further studying the mechanisms of subsurface flow and in providing theoretical basis for improving rainfall-runoff watershed models.
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