敦煌月牙泉域风积沙含水层渗透速度示踪试验

Tracing test for seepage velocity in the aeolian sand aquifer of the Crescent Lake near Dunhuang

通过渗水应急治理措施,月牙泉湖水域长期萎缩状态得到了遏制。但是由于长期补水,月牙泉域地下水流场、水质及周边地质环境产生了变化。通过月牙泉湖周围1km地区利用钼酸铵作示剂进行地下水流示踪试验,对泉域风积沙潜水含水层地下水流动方向、渗透速度进行探索性试验研究。试验结果表明月牙泉湖周围地下水流方向由西向东流入月牙泉湖,随后向东北方向径流流出,速度为24.25～27.60mmin。

Through the measurement of recharge of water,the long-term shrinking state of the Crescent Lake water area has been controled.However,the seepage field of groundwater,water quality and nearby geological environment has changed owing to the long-term recharge.Using tracing test of groundwater flow with the ammonium molybdate in the area of 1 km around the Crescent Lake,this paper describes the groundwater flow direction,seepage velocity in the aeolian sand aquifer.The test results show that the groundwater flows from west to east into the Crescent Lake,then to the northeast out of the lake.The speed ranges from 24.25 to 27.60m/min.