Abstract—

Data on groundwater recharge is necessary for solving different classes of hydrogeological problems. One of the recharge estimation methods is flow simulation in the vadose zone. Soil hydraulic parameters are used to estimate the recharge by flow in the vadose zone. One of these hydraulic parameters is the pore connectivity l. The estimated recharge sensitivity to the pore connectivity, especially under humid climate conditions, has not been studied thoroughly. In this study, the experimental values of soil hydraulic parameters of samples from two different sites with various landscape conditions and vadose zone structure (forest conditions on sand and field conditions on loam) have been used to estimate the groundwater recharge. The recharge was also estimated at l = 0.5 and at reported values of the l parameter for a certain type of sediment. According to the calculation results, the use of a fixed value of l = 0.5 leads to a significant overestimation of recharge under both forest and field conditions, which emphasizes the importance of experimental determinations of soil hydraulic parameters for the groundwater recharge estimation. According to the data from an analysis on water balance components, the increase in the estimated recharge with an increase in l is mainly related to a decrease in a top soil evaporation.

中文翻译：

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渗流带地下水补给对岩石孔隙连通性参数的敏感性

摘要—

地下水补给的数据对于解决不同类别的水文地质问题是必要的。补给估算方法之一是在渗流区内进行流动模拟。土壤水力参数用于通过渗流带中的流量估算补给量。这些水力参数之一是孔隙连通度l。尚未全面研究估计的对孔隙连通性的补给敏感性，尤其是在潮湿气候条件下。在这项研究中，使用了来自两个具有不同景观条件和渗流带结构（沙地上的森林条件和壤土上的田间条件）的不同地点的样本的土壤水力学参数的实验值，以估算地下水的补给量。再充值也估计为升= 0.5，并且对于某种类型的沉积物，其参数为l参数的报告值。根据计算结果，使用固定值l = 0.5会导致森林和野外条件下补给的明显高估，这强调了通过实验确定土壤水力参数对于地下水补给估算的重要性。根据对水平衡成分的分析数据，估算的补给量随l的增加而增加，主要与表层土壤蒸发量减少有关。