摘要
对比浅层地下水与河水及降水的环境同位素数据表明，塔里木河下游浅层地下水直接起源于河水，其初始同位素组成为δＤ＝－７０．５‰，δ１８Ｏ＝－１０．５‰。稳定同位素研究证明，地下水中的高盐份主要是再度强烈蒸发的结果。利用环境氚，根据指数模型初步计算了地下水年龄和年平均补给量。
A comparison of isotopic data of shallow groundwater with those of river water and local rainfall indicates that the groundwater of the lower Tarim River directly originates from the river water which is recharged by preciptation and snowmelt waters in mountain areas. The trend lines converge near δ D of -70 5‰ and δ 18 O of -10 5‰, suggesting approximately the original isotopic composition of the river water and shallow groundwater. The steady isotope study shows that the sources of high salinity in the groundwater are mainly high rate evaporation. With the environmental trituim,the groundwater residence time and its mean annual recharge rate have been estimated on the basis of exponential model.
出处
《成都理工学院学报》
CSCD
1997年第3期89-95,共7页
Journal of Chengdu University of Technology
关键词
环境同位素
地下水
滞留时间
塔里木河
environmental isotope
shallow groundwater
origin
salinization
residence time
