大垌幅水化学特征分析

Hydrochemical characteristics assessment in Dadong map-area

为研究大垌幅水化学特征,对图幅内地表水和地下水进行系统采样,运用数理统计、离子比值关系和水化学分析等方法对测试结果进行分析。结果表明:大垌幅地表水和地下水均偏弱酸性,属低矿化度水,地表水和地下水的优势阳离子均为Ca^(2+),优势阴离子均为HCO_(3)^(-)。地表水水化学类型主要为重碳酸-钙镁型水和重碳酸硫酸-钙镁型水;地下水化学类型主要为重碳酸-钙镁型水和重碳酸硫酸-钠钙镁型水。地表水和地下水联系性一般,岩石风化作用对区内水体的水化学离子组成影响较为显著。

To explore the hydrochemical characteristics of Dadong,the surface water and groundwater of the map are systematically sampled,and the test results were analyzed by mathematical statistics,ion ratio relationship and hydrochemical analysis.The results show that both surface water and groundwater in Dadong area are slightly acidic and belong to low mineralized water.The dominant cations of surface water and groundwater are Ca^(2+),and the dominant anion are HCO_(3)^(-).The chemical types of surface water are mainly bicarbonate calcium magnesium water and bicarbonate sulfuric acid calcium magnesium type water;the chemical types of groundwater are mainly bicarbonate calcium magnesium type water and bicarbonate sulfate sodium calcium magnesium type water.The relationship between surface water and groundwater is general,and rock weathering has a significant impact on hydrochemical ion composition of water in the area.