Wenner法探测日本海岸附近淡盐境界面的实验研究

本文在理论上对电探查法探测由数层地质构造组成的海岸带含水层的淡盐境界面的可能性进行探讨的基础上,对太平洋沿岸某地区进行了实地测量研究。在测量设置在海岸附近及分布于海岸纵深方向的观测井铅直方向电导率的同时,在观测井附近进行了电探查。结果表明,电探查法探测的淡盐境界面的深度与依据井水电导率区分的混合区域上端几乎一致,即电探查法探测的淡盐境界面的位置在混合区域的上端。因此,该方法作为一种监测海水入侵的手段是非常适宜的,且与以往的手法比较也是一种简单、快速、成本低廉的确定淡盐境界面深度的方法。

Survey of Fresh-Salt Water Interface of Coast Aquifer by Wenner Method

On the basis of analyzing theoretically the feasibility of detecting fresh-salt water interface of coast aquifer composed of multilayered geologic structure by electricity detection,this paper surveyed some areas near the Pacific Ocean coast.It surveyed the wells near and far away from the coast by the parallel methods of electricity detection and surveying vertical conductivity of well water.The results showed that the fresh-salt water interface depth detected was nearly coincident with the upper layer of mixed area divided according to well water conductivity,i.e.the position of fresh-salt water interface detected is on the upper layer of mixed area.So electricity detection is an appropriate method to monitor seawater invasion and also a simple,fast,cost inexpensive detecting technique in determining fresh-salt water interface depth compared with traditional techniques.