秦皇岛洋河-戴河冲洪积平原第四系含水层海水入侵机理分析  

Mechanism of the Seawater Intrusion in Quaternary Aquifers between Yanghe-Daihe Rivers, Qinhuangdao Area

作　　者：杨吉龙[1,2] 韩冬梅[3] 肖国强[1] 潘桐[1] 

机构地区：[1]天津地质矿产研究所,天津300170 [2]吉林大学环境与资源学院,长春130026 [3]中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京100101

出　　处：《地质调查与研究》2009年第2期144-149,共6页Geological Survey and Research

基　　金：国家地质大调查项目:环渤海地区重点地段环境地质调查及脆弱性评价(1212010540501)

摘　　要：通过对秦皇岛洋河-戴河冲积平原地区枣园水源地野外调查和不同水样的水文地球化学及多种同位素测试分析发现:1)该区海水入侵过程中的水化学作用主要是海水与粘土含量高的地层中钙质矿物阳离子的交换;2)海水入侵不是沿含水层整体向前推移,而是存在优先入侵通道(如断层和水势差较大水流方向)和局部入侵速度较快的现象;3)深层和浅层地下水水力联系较大,海水入侵已经影响到深层地下水;4)研究区地下水平均氚浓度为9.86 TU,地下水平均年龄介于17.6a～23.7 a之间,地下水流速约为2.11 m/a,整体上地下水循环路径短,径流速度快,地下水交替强烈。这些结果可为以后进一步治理海水入侵和合理利用地下水提供依据。Through the field investigation and water sample test and hydrochemical and multi-isotopic measurement in Zaoyuan well field of Qinhuangdao, it can be found that the main hydrogeochemieal behavior is cation exchange reaction between sodium and calcium-riched materials in high clay content sediments during the seawater intruding the fresh aquifer. In this study area, the seawater intursion is not entirely moving towards inland with parallel patterns. There are preferential intrusion channels, which result in the local fast seawater intrusion, such as at fault zones and in direction of higher hydraulic gradient. It also can be found that there is great hydraulic connection between deep and shallow groundwater, and the deep groundwater has been affected by seawater intrusion. The mean tritium contents in groundwater is 9.86 TU with mean groundwater age of 17.6 - 23.7 a. The mean groundwater velocity is about 2.11 m/a. Generally, groundwater has short flow path with fast flow velocity. This study can provide evidence for further taking counter measure to prevent from seawater intrusion and rehabilitate groundwater.

关 键 词：洋河 戴河 海水入侵 同位素 秦皇岛 

分 类 号：P641.12[天文地球—地质矿产勘探]