贵州岩溶地下水水文地球化学特征

Hydro-geochemical characteristics of Karst groundwater in Guizhou

贵州碳酸盐岩广布,岩溶地下水资源丰富,是本地区生产生活用水的主要来源。本文以贵州岩溶地下水为研究对象,选取2012-2021 a期间具有代表性的2170件岩溶水点水质分析成果作为统计分析基础,分析总结区内岩溶地下水水文地球化学特征。研究结果表明,区内岩溶地下水水化学类型以HCO_(3)-Ca·Mg、HCO_(3)-Ca及HCO_(3)·SO_(4)-Ca型水为主,地下水离子组分主要受岩石风化作用控制,主要阴离子HCO_(3)-、SO_(4)^(2-)和阳离子Ca^(2+)、Mg^(2+)及其含量均表现出与含水岩组地球化学性质相对应的关系,地下水径流过程中以方解石和白云石的共同溶解为主,同时部分地下水化学性质受自然地理及人为因素影响较大。

Carbonate rock is widely distributed in Guizhou,and karst groundwater resources are rich,which is the main source of production and domestic water in this region.This paper takes Guizhou karst groundwater as the research object,selects 2170 representative karst water quality analysis results from 2012 to 2021 as the statistical analysis basis,and analyzes and summarizes the hydro-geological and geochemical characteristics of karst groundwater in the area.The research results show that the hydro-chemical types of karst groundwater in the area are mainly HCO_(3)-Ca·Mg,HCO_(3)-Ca and HCO_(3)·SO_(4)-Ca water.The main anion and cation HCO_(3)-,SO_(4)^(2-)and Ca ^(2+),Mg ^(2+)all show the corresponding relationship with the water bearing rock group.The groundwater runoff process is dominated by the co dissolution of Calcite and dolomite,At the same time,the chemical properties of some groundwater are greatly influenced by natural geography and human factors.