采用氯离子示踪法计算沙漠降雨入渗量

Application of chloride tracer method to study replenishment ratio of precipitation in desert

为了研究巴丹吉林沙漠东南部地区的降雨入渗补给量,基于沙漠东南部两个剖面的氯离子质量浓度、质量含水率数据,利用氯离子示踪法计算了巴丹吉林沙漠东南部地区的降雨入渗补给量。结果表明乌海子、诺尔图地区的年平均补给率分别为0.81mm/a和1.24mm/a,仅占多年平均降雨量的0.9%和1.4%,因此当地现代降水对巴丹吉林沙漠东南部地区地下水的补给十分微弱,即当地现代降雨并非为此区域地下水的主要补给源。

Two profiles, located in Wuhaizi and Nuoertu, respectively, were sampled to evaluate the annual groundwater recharge in southeast of Badain Jaran Desert using method of chloride mass balance. The mean annual recharge calculated was 0.81 mm/a and 1.24 mm/a, which account for 0.9% and 1.4% of the mean annual precipitation, respectively. This implies that the direct recharge through the unsaturated zone is negligible. Thus, the local modern precipitation infiltration recharge is not the main replenishment source of groundwater.