岩土力学2025，Vol.46Issue(11)：3329-3345,17.DOI:10.16285/j.rsm.2024.1479
考虑根系对水文特性影响下非饱和植被土中水分一维瞬态渗流解析解
Analytical solution for one-dimensional transient seepage of water in the unsaturated vegetated soil considering the effects of roots on hydrological properties
摘要
Abstract
In the natural environment and engineering scenarios,there are not only bare unsaturated soils but also unsaturated soils covered by vegetation(i.e.,unsaturated vegetated soils).For the unsaturated vegetated soil with a uniform root architecture,on the basis of considering the effects of roots on the hydrological properties,the linearized governing equations for one-dimensional transient seepage of water are acquired by some simplifying assumptions and variable substitution.The analytical solution for one-dimensional transient seepage of water in the unsaturated vegetated soil is obtained through the methods of separation of variable and series transformation.Subsequently,the computational results of this analytical solution have been compared with those of the existing analytical solution and the corresponding finite-difference solution to verify its reasonableness.Finally,a simple vegetated cover is taken as an example to analyze the influences of root-related parameters on its effectiveness in blocking rainwater infiltration.The results show that the cumulative leakage CQb at the bottom zone of a vegetated cover under the same rainfall scenario is smaller than that of a single cover without vegetation,and an increase in the rooted soil thickness lg enhances the effectiveness of the vegetated cover in blocking rainwater leakage.The increase of the transpiration rate Tp significantly reduces the leakage rate at the bottom zone of the vegetated cover under the rainfall scenario,and the cumulative leakage CQb tends to decrease linearly with an increase in Tp.Compared with the extreme case where the root volume ratio Rv is zero and the effects of roots on the hydrological properties of soil are ignored,the effectiveness of the vegetated cover in blocking rainwater leakage is enhanced when the saturated permeability coefficient of the rooted soil decreases due to the value Rv,and conversely,it is weakened.Overall,this study could provide scientific guidance for engineering practices related to water infiltration in unsaturated vegetated soils.关键词
非饱和植被土/瞬态渗流/解析解/水文特性/根系吸水Key words
unsaturated vegetated soil/transient seepage/analytical solution/hydrologic properties/root water uptake分类
建筑与水利引用本文复制引用
王浩,侯泓冰,江文豪..考虑根系对水文特性影响下非饱和植被土中水分一维瞬态渗流解析解[J].岩土力学,2025,46(11):3329-3345,17.基金项目
福州大学科研启动基金项目(No.511503) （No.511503）
国家自然科学基金面上项目(No.42477165).This work was supported by the Project of Research Initiation Fund of Fuzhou University(511503)and the Project of National Natural Science Foundation of China(42477165). （No.42477165）
