降雨条件下坡面径流与坡体渗流耦合模型研究

RESEARCH ON COUPLING MODEL OF SLOPE FLOW AND SEEPAGE UNDER RAINFALL CONDITIONS

降雨条件下坡内渗流和坡面径流产生的山地灾害链式反应已经逐渐成为国内外研究的重点,但由于认识的局限性,坡内渗流、坡面径流、坡面侵蚀、泥石流启动和滑坡等过程往往被人为分割成几个部分分别加以研究,导致对降雨而引起的山地灾害各因素之间的有机联系缺乏深刻的认识。本文采用Richards方程和Saint-Venant方程组分别描述坡体入渗和坡面径流问题,用有限体积法(FVM)对以上问题编写Matlab程序求解,并在每一个时间步对Richards方程和圣维南方程进行数值耦合,得到降雨条件下的坡体入渗和坡面径流耦合模型。通过算例,表明基本规律符合现实情况,说明了所建立耦合模型的可靠性。

The chain reaction of mountain disasters caused by seepage and slope runoff under rainfall conditions has gradually become the focus of research at home and abroad, but due to the limitations of understanding, seepage in slopes, slope runoff, slope erosion, and debris flow initiation and Landslides and other processes are often artificially divided into several parts and studied separately, leading to a lack of deep understanding of the organic links between the various factors of mountain disasters caused by rainfall. In this paper, Richards equations and Saint-Venant equations are used to describe the slope infiltration and runoff problems respectively. The finite volume method(FVM) is used to solve the above problems by programming the Matlab program, and Richards equation and St. The process is numerically coupled to obtain a coupled model of slope infiltration and runoff under rainfall conditions. Through examples, it is shown that the basic laws are in line with reality. Describes the reliability of the established coupling model.