频率域航空电磁法在雄安新区浅层(微)咸淡水调查中的应用

Application of the frequency-domain airborne electromagnetic method in shallow(brackish)saline water and freshwater surveys in the Xiong'an New Area

探明含(微)咸水地区的浅层咸淡水分界现状,对于当地浅层水资源的开发利用具有指导意义。笔者通过对雄安新区频率域航空电磁数据反演,得到地下浅层电性结构特征,进而推断新区浅层(微)咸淡水分界线。通过对比1998年、1999年两次水文地质调查咸淡水分界线,结合地面水文地质资料,笔者发现浅层地下水降落漏斗会影响咸水侵入的趋势:雄县东北处的昝岗—米家务—双堂一带(微)咸水侵入是由于昝岗水漏斗的存在而趋于稳定,但水漏斗也同时加剧了昝岗镇地区南部(微)咸水入侵;安新县城西侧由于容城水漏斗水位上升,相较1999年(微)咸水范围有所减少;高阳水漏斗地区水位持续下降,导致芦庄—高阳方向(微)咸水范围将继续扩大。通过预测的(微)咸水侵入趋势为新区建设中水资源的合理开发利用提供了数据依据。

Determining the boundary between shallow saline water and freshwater in areas containing(brackish)saline water can guide the exploitation and utilization of local shallow water resources.This study analyzed the characteristics of underground shallow electrical structure through inversion based on the frequency-domain airborne electromagnetic data.Then,it inferred the boundary between the shallow(brackish)saline water and freshwater in the study area.By comparison with the boundaries between saline water and freshwater obtained from two hydrological surveys in 1998 and 1999 and by combining the surface hydrogeological data,this study revealed that the shallow groundwater cones of depression affect saline water intrusion trends in the Xiong’an New Area,and the details are as follows:The(brackish)saline water intrusion in the Zangang-Mijiawu-Shuangtang area in the northeast of Xiongxian County tends to be stable due to the presence of the Zangang groundwater cone of depression.However,this cone has also intensified the(brackish)saline water intrusion in southern Zangang Town.Compared to 1999,the(brackish)saline water range on the west side of Anxin County has continuously decreased due to the rise in the water level of the Rongcheng groundwater cone of depression.The continuous decrease in the water level of the Gaoyang groundwater cone of depression determines that the(brackish)saline water range in the Luzhuang-Gaoyang direction will continuously expand.These predicted(brackish)saline water intrusion trends will provide data support for the rational exploitation and utilization of water resources in the construction of the Xiong'an New Area.