武汉长江新城地下水化学特征及成因分析

为研究武汉地下水水化学特征及形成原因，以长江新城为研究区，于2019年7-9月采集地表水和地下水样品，对区内地下水和地表水进行测试分析.基于水化学结果，运用数理统计、离子比值分析、矿物饱和指数等方法，揭示了长江新城的水化学演化过程和主要离子来源.结果表明，区内地下水阳离子以Ca²⁺为主，阴离子以HCO₃^-为主，地下水和地表水的补给来源密切相关.地下水主要受岩石风化作用控制，同时还受一定程度的蒸发浓缩作用影响，主要离子来源受碳酸盐岩溶解沉淀控制，也存在硅酸盐岩和蒸发盐岩风化溶解作用的影响.地下水受生活污水和农业肥料施用影响较大.

Hydrochemical characteristic and formation mechanism in the Yangtze River Demonstration District, Wuhan City

An investigation was carried out on the hydrochemical components of groundwater and surface water samples collected from the Yangtze River Demonstration District during July to September 2019 to study the hydrochemical characteristics and formation of groundwater in Wuhan. Hydrochemical evolution and ion sources of the Yangtze River Demonstration District were probed into by utilizing mathematical statistics, ion ratio analysis and mineral saturation index. The results indicated that Ca²⁺ and HCO₃^- were the principal cation and primary anion in the groundwater, respectively, and groundwater and surface water were recharged from the similar sources. In addition to the general effects of evaporative concentration, the main driving force behind the formation of groundwater hydrochemical characteristics was rock weathering. Specifically, carbonate rocks (most active), silicate rocks and evaporite rocks were the main ion sources of groundwater. Agricultural fertilizer and domestic sewage were also significant influences to be reckoned with of the composition of groundwater.