枣庄市地下水化学特征及成因分析

Analysis of groundwater chemical characteristics and origin in Zaozhuang city

根据枣庄市水文地质条件以及地下水开发利用现状,选取了2020年枯、丰水期布设在具有供水意义含水层的地下水水样,分析地下水的水化学基本特征,运用Gibbs模型和离子比值法分析了枣庄市地下水的主要离子特征及其形成机制。结果表明,研究区枯、丰水期地下水pH整体呈弱碱性,按TDS划分,多数水样属于淡水(低矿化度水);按TH划分,属于硬水-高硬水;根据水化学分析得出,枣庄市水化学类型在枯水期有8种类型,丰水期有11种类型,都以HCO_(3)·SO_(4)-Ca型为主;枣庄市的水化学组分主要受碳酸盐岩的风化溶解影响,硫酸盐(如石膏)共同参与了碳酸盐岩风化。

Based on the hydro-geological conditions and the current situation of groundwater utilization in Zaozhuang City,the groundwater samples in the aquifer with water supply significance in the dry and flood seasons of 2020 were selected.The basic chemistry characteristics of groundwater were analyzed,the main ion characteristics and formation mechanism of groundwater in Zaozhuang City were analyzed by using Gibbs model and ion ratio method.The results show that the pH of groundwater in the dry and flood seasons of the study area is weakly alkaline,and according to TDS,most of the water samples belong to fresh water(low mineralization water).Based on the TH,it belongs to hard-high hard water.According to the hydro-chemical analysis,there are 8 hydro-chemical types in Zaozhuang City during the dry season and 11 types in the flood season,all of which are mainly HCO_(3)·SO_(4)-Ca types.The hydro-chemical components of Zaozhuang City are mainly affected by the weathering and dissolution of carbonate rocks,and sulfates(such as gypsum)are jointly involved in the weathering of carbonate rocks.