沂沭河下游平原地下水TDS和水化学类型的分布规律

Distribution Law of TDS and Groundwater Hydrochemical Type in the Downstream Plain of Yishu River

在对沂沭河下游平原212组地下水化学样品进行分析的基础上,总结出研究区不同循环深度地下水TDS和水化学类型的空间分布:1北部丘岗区地下水以淡水为主;东部滨海平原区浅层地下水几乎均为微咸水和咸水;深层承压水以淡水和微咸水为主,微咸水分布于沿海大部分地区和内陆的滨海县附近,沿海地区洋桥农场、图河乡一带以及东南部八滩乡的深层地下水为淡水。2北部丘岗区地下水化学类型单一;东部滨海平原区浅层地下水化学类型具有水平分带规律;深层承压水化学类型总体上由陆向海存在水平分带规律,洋桥农场、图和乡及八滩镇的水化学类型与沿海咸水区地下水化学类型存在差异。

The horizontal zonal characteristics of TDS and hydrochemical type in groundwater with different circulation depths have been studied in the downstream plain of Yishu River on the basis of analyzing 212 hydrochemical samples. The results are as follow- ing： （1）on the whole, the groundwater in the northern part is mainly fresh water; the shallow groundwater in the eastern coastal plain is mainly brackish water and saline water while the deep groundwater is mainly fresh water and brackish water, deep brackish water exists in most coastal area and Binhai county; the groundwater of Yangqiao, Tuhe and P, atan is fresh. （2）the hydrochemical types in the northern part of study area is simple;types of shallow groundwater in the eastern coastal plain has a law of horizontal zoning;gen- erally, water types of deep groundwater has a law of horizontal zoning; the water chemistry type of groundwater in Yangqiao, Tuhe and Batan is different from that of brackish water in coastal area.