Coupled analysis on the surface runoff model and the soil water movement model was carried out, in order to consider the influence of surface runoff under heavy rainfall condition on soil infiltration. The surface runoff was simulated using the Navier-Stokes equation, while the soil water movement was simulated using the Richards equation. Both equations were solved by the finite volume method. The simulation results of coupled model were compared with the calculated results of SEEP/W under the same calculation condition, in order to verify the correctness of the coupled model. And then the soil slope infiltration was calculated under heavy rainfall condition. Results show that water heads at the crest of slope and the base of slope are significantly different and the infiltration depths at the crest of slope and the base of slope are also different, which implies that the soil infiltration can be greatly improved by the surface runoff. The soil slope infiltration intensity is indeed increased with the increasement of the surface runoff.
Gen LI,Tong-chun HAN,Jun-yang WU,Yu ZHANG. Coupled analysis on surface runoff and soil water movement by finite volume method. Journal of ZheJiang University (Engineering Science), 2022, 56(5): 947-955.
Fig.1One-dimensional surface runoff conceptual model
Fig.2Space and time discretization of surface runoff equation
Fig.3Mesh relationship of adjacent control units
Fig.4Non-orthogonality mesh vector of adjacent control units
Fig.5Couple steps of surface runoff and soil water movement
Fig.6Case result comparison of coupled model and SEEP/W under same fixed head condition
Fig.8Case result comparison of coupled model and SEEP/W under same fixed flux condition
Fig.7Numerical simulation distribution diagram of soil column initial water head
Fig.9Numerical simulation size of soil slope
Fig.10Variation of numerical rainfall intensity over time
Fig.11Water head of slope top at profile A-A and B-B over time
Fig.12Water head of slope surface over time
Fig.13Infiltration at profile A-A and B-B at time of 3 h
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