考虑地表径流与地下渗流耦合的斜坡降雨入渗研究

A preliminary study of rainfall infiltration on slope using a new coupled surface and subsurface flow model

为简化分析,在模拟斜坡降雨入渗暂态渗流时,通常没有考虑入渗和产流的耦合过程。笔者提出了一种新的考虑地表径流与地下渗流耦合的斜坡降雨入渗分析方法,它较好地模拟了入渗和产流的过程,并通过算例,研究了考虑与不考虑该耦合作用对斜坡孔隙水压力分布的影响。

For simplicity, a conventional approach in modeling subsurface transient flow in slopes is to uncouple the infiltration and runoff processes during a storm event. In reality, the time variation of infiltration amount during a storm event cannot be estimated easily unless interactions between rainfall, infiltration, and surface runoff processes are properly considered and modeled. In this paper, a new coupled surface-subsurface flow model is developed to consider the interaction between surface and subsurface flows during a transient seepage analysis of a rainfall-infiltrated slope. Comparisons between computed pore water pressure distributions from the conventional approach and the new model are illustrated.