河西走廊张掖盆地含水层的水资源调节能力分析

The aquifer's capability of regulating water resources in Zhangye Basin,Hexi Corridor,Gansu Province,China

张掖盆地是河西走廊黑河干流中游一个相对独立的水文地质单元,含水层以大厚度第四系冲洪积物为主。戈壁带地下水位长期监测数据的分析表明,河水入渗转化为地下水后,可以在附近含水层中存留20个月以上。整个盆地泉水溢出量与黑河干流径流量的对比分析表明,二者的天然动态周期均约为14 a,但丰枯变化正好相反,互为补充。据此认为,盆地内大厚度第四系含水层是条件优良的天然地下水库,如果得到合理开发利用,对科学配置整个流域水资源、保护恢复下游额济纳平原生态等具有重要意义。

Zhangye Basin,located in the middle part of Hexi Corridor,Gansu Province,is relatively an independent hydrogeological unit.The aquifer system mainly consists of thick Quaternary deposits.Long-term groundwater monitoring data within Gobi desert indicates that,from the beginning of surface water infiltrating to its running out of the in-situ aquifer,the process can last over 20 months.Long-term monitoring data of the basin＇s total spring overflow together with Heihe River flow shows that the dynamic periods of them are all about 14 years,but their peak and trough are opposite.This tells us that they can compensate each other very well.Based on the above,it can be concluded that the thick Quaternary aquifer in Zhangye Basin is an ideal reservoir for regulating water resources.To develop and manage this reservoir scientifically is not only a key measure of optimizing water resources management of the river basin,but also meaningful to the ecosystem protection and recovery of the Lower Reach Ejina Plain.