兰陵县地下水的水化学分布特征及其形成条件分析

Study on the Hydrochemical Characteristics and Formation Conditions of Groundwater in Lanling County

为查明兰陵县(原苍山县)地下水的水化学特征及其成因,为地下水开发管理与水质保护提供科学依据,在研究区采集了93件地下水水样,综合运用数理统计、Piper三线图、Gibbs图以及离子比等方法对地下水水样的测试结果进行分析。结果表明:兰陵地区碳酸盐岩夹碎屑岩岩溶裂隙地下水和碳酸盐岩裂隙岩溶地下水的水化学类型主要为HCO_(3)-Ca(Mg)型、HCO_(3)·SO_(4)-Ca(Mg)型水;碎屑岩孔隙裂隙岩溶地下水和侵入岩风化裂隙地下水的水化学类型主要为HCO_(3)·SO_(4)-Ca(Mg)型水;松散岩类孔隙地下水的水化学类型主要为HCO_(3)-Ca型水;地下水中离子主要来源于硅酸盐岩和碳酸盐岩等的风化溶解,同时也受到人类生活、工业生产以及农药化肥过量使用的影响。

In order to find out the hydrochemical characteristics and causes of groundwater in Lanling County to provide scientific basis for groundwater quality protection and groundwater development and management,we collect hydrochemical analysis data of 96 groundwater samples in the study area,utilize methods such as mathematical statistics,Piper trilinear diagram,Gibbs diagram and ion ratio,to analyze test result of the samples,and discuss hydrochemical characteristics and the formation conditions of groundwater in the study area.The results indicate that the main chemical types of karst groundwater in carbonate rock intercalated with clastic rock and carbonate rock fracture are HCO_(3)-Ca(Mg)type、HCO_(3)·SO_(4)-Ca(Mg)type water;the chemical type of karst underground water of pore fissure of clastic rock and weathered fracture of intrusive rock is mainly HCO_(3)·SO_(4)-Ca(Mg)type water;the chemical type of pore underground water of loose rock is mainly HCO_(3)-Ca type water.Groundwater ions mainly come from weathering and dissolution of silicate and carbonate rocks,and are also affected by human life,industrial production and excessive use of pesticides and fertilizers.