水文地质工程地质2026，Vol.53Issue(2)：115-125,11.DOI:10.16030/j.heg.202412070
地下水水位与蒸发作用共同影响下包气带水分运动机理研究
Mechanisms of moisture movement in the vadose zone under combined effects of groundwater level and evaporation
摘要
Abstract
Soil moisture movement in the vadose zone is a multi-field coupling process largely controlled by the depth of water table.The purpose of this study is to investigate the mechanisms of moisture dynamics in the vadose zone under the combined influence of groundwater levels and evaporation.This study investigated coupled moisture and heat transport in the vadose zone under evaporative conditions through laboratory experiments and numerical simulation.Based on the height of capillary water rise,two distinct water table depths,shallow and deep,were examined to explore differences in soil moisture behavior.Results show that under a shallow water table,strong hydraulic connectivity is established between the soil surface and water table,and water content significantly decreases due to evaporation.In contrast,under a deep water table,a near-surface zone of low and weakly variable water content develops,where upward liquid water fluxes and downward water vapor fluxes achieve equilibrium.Isothermal liquid water fluxes and thermal water vapor fluxes are the main forms of soil moisture movement.Matric potential significantly influences water vapor movement only within 0.3 cm of the soil surface,while the influence of temperature on liquid water movement can be ignored.Water vapor movement under deep water table is more intense than that under shallow water table.The moisture movement in the vadose is governed by both evaporation and groundwater levels.This study can provide reference for analyzing the water movement in the vadose zone using fully coupled simulation methods,which is helpful to moisture conservation and environmental protection in the arid and semi-arid areas.关键词
包气带/多场耦合/地下水水位/水热运动/数值模拟Key words
vadose zone/multi-field coupling/water table/soil moisture and heat transport/numerical simulation分类
天文与地球科学引用本文复制引用
李伟健,王锦国,陈波,王浩,刘东平..地下水水位与蒸发作用共同影响下包气带水分运动机理研究[J].水文地质工程地质,2026,53(2):115-125,11.基金项目
国家重点研发计划项目(2023YFC3706001) （2023YFC3706001）
国家自然科学基金项目(42477181) （42477181）
上海市"超级博士后"激励计划项目(2024465) （2024465）
上海勘测设计研究院有限公司科研项目(2024SD(83)-002) （2024SD(83）
