Transient State Analysis of Rainfall Infiltration Into Layered Vegetated Soils

IF 3.6 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-09-12 DOI:10.1002/nag.70068

Cheng Yuan, Changbing Qin, Liang Li, Xiaoqin Lei

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引用次数: 0

Abstract

Vegetation plays a pivotal role in altering the hydraulic properties of soils, and its effect is stemmed from plant transpiration and also undermined by rainfall. As for the intricate transient behavior of vegetated soils under rainfall, many extant studies either presumed homogeneous soil properties or concentrated on a steady‐state analysis, neglecting the moisture distribution with time in layered vegetated soils. This study proposes a transient analytical model for rainfall infiltration in layered vegetated soils based on Richard's equation. This model is developed by incorporating a depth‐dependent root water uptake sink term and utilizing variable substitution, separation of variables, and the transfer matrix method to derive the pore water pressure (PWP) distribution across different soil layers. The results calculated from the proposed model coincide with those from numerical simulations, with a maximum error of 2.5% in negative PWP in the case study, demonstrating the robustness of this model. Moreover, a parametric study is performed for a better understanding of the impacts of rainfall intensity, thickness of vegetated soil, and transpiration rate on the hydraulic properties of layered vegetated soils. This study well addresses the gap in transient analytical solutions of rainfall infiltration into layered vegetated soils and provides a benchmark for related numerical models.

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层状植被土壤降雨入渗的瞬态分析

植被在改变土壤水力特性方面起着关键作用，其作用源于植物的蒸腾作用，也受到降雨的破坏。对于降雨作用下植被土复杂的瞬态特性，现有的许多研究要么假设土壤的均匀性，要么集中于稳态分析，而忽略了层状植被土中水分随时间的分布。本文提出了基于Richard方程的层状植被土壤降雨入渗瞬态分析模型。该模型通过引入深度相关的根系吸收汇项，并利用变量替换、变量分离和传递矩阵法推导出孔隙水压力（PWP）在不同土层中的分布。该模型的计算结果与数值模拟结果吻合，在负PWP情况下的最大误差为2.5%，证明了该模型的鲁棒性。此外，为了更好地了解降雨强度、植被土壤厚度和蒸腾速率对层状植被土壤水力特性的影响，进行了参数化研究。该研究很好地解决了降雨入渗层状植被土壤瞬态解析解的空白，并为相关数值模型提供了基准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

CiteScore

6.40

自引率

12.50%

发文量

160

审稿时长

9 months

期刊介绍： The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.