基于有限体积法的地表径流与土壤水流耦合分析

为了考虑强降雨条件下地表径流对土体入渗的影响，将地表径流模型同土壤水流模型进行耦合分析. 采用Navier-Stokes方程模拟地表径流，采用Richards方程模拟土壤水流，2种方程均采用有限体积法求解. 在相同计算条件下，将耦合模型数值模拟结果与SEEP/W计算结果进行对比，以验证耦合模型的正确性，根据耦合模型计算边坡在强降雨条件下的入渗情况. 研究发现，在地表径流条件下，边坡坡顶和坡底水头相差较大，坡顶和坡底入渗深度存在明显差异，说明地表径流对土体的入渗有着较大的提高. 研究表明，随着地表径流的增强，土坡入渗强度提高.

Coupled analysis on surface runoff and soil water movement by finite volume method

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.