巴丹吉林沙漠湖泊和地下水补给机制

巴丹吉林沙漠湖泊及地下水的补给来源和补给途径问题近年来争议很大。根据巴丹吉林沙漠湖泊及地下水的特征,就水化学条件、环境同位素及相关的示踪理论研究巴丹吉林沙漠湖泊和地下水的补给机制。结果表明:巴丹吉林沙漠湖泊和地下水的补给源有黑河中上游河水、祁连山大气降水和冰雪融水,比较有争议的补给源是青藏高原上的一些湖泊水,尽管都有同位素依据,但没有考虑到氧漂移因素。在补给途径上,既有河西走廊祁连山前缘洪积扇地下水、雅布赖山前洪积扇地下水等通过巨厚覆盖层潜水或承压盆地水对巴丹吉林沙漠湖泊和周边地下水的缓慢补给,也有祁连山区大气降水和冰雪融水入渗通过基岩地层的深部循环后向上渗透补给沙漠湖泊及周边地下水的快速补给,而且已经从古老碳酸盐岩地层的存在、区域活动断裂构造体系的发育,以及地下水幔源氦同位素特征、巴丹吉林沙漠湖泊中钙华幔源碳特征等方面得到验证。

Recharge mechanisms of lakes and groundwater in Badain Jaran Desert

There has been a huge dispute about the source and pathways of recharge of scarce groundwater in the Badain Jaran Desert in recent years.Based on the characteristics of lakes and groundwater in the Badain Jaran Desert,their recharge mechanisms were studied in terms of hydrochemistry conditions,environmental isotopes,and related tracing theory.The results showed that the commonly recognized recharge sources were the river water of the upper and middle reaches of the Heihe River,meteoric water,and ice-snow me...