Improvement of rainfall boundary treatment based on single
and double permeable media

DOU Zhi; LIU Yi-min; ZHOU Zhi-fang; ZHUANG Chao; WEI Yun-bo

doi:10.16285/j.rsm.2021.0852

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Improvement of rainfall boundary treatment based on single and double permeable media

更新时间：2026-06-25

- Improvement of rainfall boundary treatment based on single and double permeable media
- Vol. 43, Issue 3, Pages: 789-798(2022)
- 作者机构：
  
  河海大学地球科学与工程学院,江苏,南京,211100
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.0852
  CLC： TU43
- Online First：23 March 2022，
  
  Published：2022
- 稿件说明：
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DOU Zhi, LIU Yi-min, ZHOU Zhi-fang, et al. Improvement of rainfall boundary treatment based on single and double permeable media[J]. 2022, 43(3): 789-798.
DOI：

DOU Zhi, LIU Yi-min, ZHOU Zhi-fang, et al. Improvement of rainfall boundary treatment based on single and double permeable media[J]. 2022, 43(3): 789-798. DOI： 10.16285/j.rsm.2021.0852.

摘要

在降雨入渗模拟中，现有研究无法准确实现复杂降雨条件下降雨边界在流量与压力两类边界之间的双向动态转换。基于饱和?非饱和渗流理论，将降雨补给流量与实际入渗流量的差值作为两类边界动态转换的判别条件，改进了单重渗透介质降雨边界动态转换控制方程，并进一步提出了双重渗透介质降雨边界处理方法及控制方程，在此基础上进行了数值试验及工程实例验证。结果表明：改进的降雨边界动态转换控制方程克服了传统降雨边界只能实现流量到压力边界单向转换的局限性，可准确实现流量边界与压力边界的双向动态实时转换；案例边坡的降雨入渗模拟结果说明了改进后降雨边界的正确性和工程适用性。

Abstract

In the simulation of rainfall infiltration

current studies cannot realize the real-time conversion between the flow boundary and pressure boundary so as to accurately capture the groundwater movement characteristics under complicated rainfall conditions. Based on the saturated-unsaturated seepage theory

the difference between the rainfall recharge flow and actual infiltration flow on the boundary was used as a new judgment condition to distinguish the flow and pressure boundaries. The governing equation of dynamic transformation for the rainfall boundary in the single permeability medium was modified. Furthermore

the treatment method and governing equation were proposed to deal with the rainfall boundary in double permeability media. Numerical experiments and field application were conducted to verify and demonstrate the robustness of the newly proposed approaches. The simulation results suggest that the improved governing equation of dynamic transformation regarding rainfall boundary overcomes the limitations of traditional rainfall boundary processing methods

and can accurately realize the dynamic and real-time conversion between flow boundary and pressure boundary. The simulation results of rainfall infiltration on an in-situ slope illustrate the correctness and engineering applicability of the improved rainfall boundary.

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