摘要
Abstract
Taking the Luancheng Experimental Station and Ranzhuang Experimental Station in the Hebei Plain as research sites,this study uses the Hydrus-1D model to investigate the effects of deep vadose zone soil water dynamics on rainfall infiltration recharge.The results show that:①At Luancheng Station,the soil water potential gradient below 2 m remained consistently positive,with the zero-flux plane reaching a maximum depth of 2 m.At Ranzhuang Station,soil moisture moved unidirectionally downward below 3 m,with the zero-flux plane at a depth of 3 m.②The deep vadose zone exhibited significant regulation and lag effects on water flux.At Luancheng Station,the peak water flux at a depth of 8 m lagged approximately 3 months behind that at 2 m.At Ranzhuang Station,flux fluctuations at depths of 6 m and 8 m decreased by 1.5%to 3.4%compared to that at 3 m.These findings provide a theoretical basis for groundwater recharge assessment in plain areas and demonstrate that the characteristics of the deep vadose zone play a decisive role in the spatial and temporal distribution of rainfall infiltration.关键词
降雨入渗/深层包气带/水动力特征/土壤含水量Key words
Rainfall Infiltration/deep vadose zone/hydrodynamic characteristics/soil moisture content分类
地质学
