开采条件下河北平原中部咸淡水界面下移

Down-movement of the fresh-saline groundwater interface in the middle of the Hebei Plain under the condition of exploitation

河北平原中部上层咸水入侵下层淡水已造成局部地下水污染,本文调查统计了地下水质监测资料和2700多眼深井孔的测井物探资料。以水化学方法和数理统计方法,从水文地质条件和地下水开采利用状况入手,对研究区咸淡水界面下移的机理进行了分析。结果认为,咸淡水界面从20世纪70年代以来年均下移约0.4m,开采地下水造成上下层水头压力变化,加大上部浅层水向下越流是其主要原因之一。

Intrusion of the upper saline groundwater into the fresh groundwater in the lower aquifer has caused partial groundwater contamination in the middle of the Hebei Plain, Water quality data and geophysical prospecting materials were selected from more than 2700 wells in the study area. Based on the analyses of the data and considering the hydrogeological conditions and ground water exploitation conditions, the mechanism of down-movement of the fresh-saline groundwater interface was methods. Conclusions were drawn in this paper that the described with water chemical and mathematical statistic annual average down-movement of the interface is 0. 4 m since the 1970s in the last century because of the overpumping of groundwater in the deep aquifer. Exploitation ground water has caused variations in water levels in both the upper saline groundwater and lower fresh groundwater Therefore, over-exploitation of groundwater in the deep aquifer is one of the main reasons for the down-movement of the interface.