滨海地区海水入侵的一种测定方法

海水由于含盐量较高而具有较高的电导率,通过测定滨海地区的地下水电导率并和该地区地下水标准电导率进行对比,可判断海水入侵现象。结合辽宁省大连市一处海边场地,介绍了根据地下水中的电导率分布情况来判断场区是否存在海水入侵的方法:通过对现有观测孔的电导率测试,选择适当的剖面,绘制各剖面的电导率分布图,结合当地的水文地质情况,判断是否有海水入侵现象以及海水入侵的范围和程度。测试结果表明,场区除局部电导率偏高外,没有发生大面积的海水入侵现象。

Method for measurement of seawater intrusion in coastal areas

Seawater is of high electrical conductivity due to its high salinity.The electrical conductivity of groundwater in seashore area was measured and compared with the standard value of this area,so that the seawater intrusion could be evaluated.With a seashore field in Dalian City of Liaoning Province as an example,the method for evaluating seawater intrusion based on the distribution of electrical conductivity was introduced: certain cross sections were selected according to the measured data of electrical conductivity at existing observation boreholes,then the distribution diagram of electrical conductivity in each cross section was plotted,and finally whether the phenomenon of seawater intrusion occurs as well as its range and degree was evaluated according to the local hydrological and geological condition.Test result shows that,although high electrical conductivity occurs in local area,large area seawater intrusion does not take place.