黔北大方地区地下水及地表水化学类型及特征分析

Chemical property analysis of ground water and surface water in Dafang aera,Guizhou province

结合贵州1:5万响水等6幅岩溶石山区域地质调查项目,对黔北大方地区不同地层区、不同类型的地下水及地表水采样分析,探讨其水化学特征。研究区有六种地表水化学成分类型、十种地下水化学成分类型类型主要为HCO_3^--SO_4^(2-)-Ca^(2+),HCO_3^--Ca^(2+),HCO_3^--Ca^(2+)-Mg^(2+)及HCO_3^--SO_4^(2-)-Ca^(2+)-Mg^(2+)四种类型;地表水及地下水的酸碱性均以弱碱性为主,占地表水的95.45%、占地下水的93.55%;矿化度及总固溶量均小于1000 mg/L,全为淡水;水的硬度以弱硬水为主,占地表水的68.18%,占地下水的58.06%;不同地层岩性区及不同水类型的水化学性质存在一定差异。

Variant ground water and surface water from different strata in Dafang aera,northern Guizhou province were sampled and analysed in order to explore water chemical properties in karst land geologic mapping of six piece of 1：50000 maparea including Xiangshui etc.There are ten chemical types of ground water and six chemical types of surface water in the study area mainly composed of four types such as HCO3^--SO4^2--Ca^2＋,HCO3^--Ca^2＋,HCO3^--Ca^2＋-Mg^2＋ and HCO3^--SO4^2--Ca^2＋-Mg^2＋.Surface water and groundwater in the acid and alkali were weak alkaline,accounting for 95.45%of the surface water and for 93.55%of the ground water.Mineralization intensity and total solids are both smaller than 1000mg/l belonging to fresh water.The hardness of water is mainly on weakly hard water,accounting for 68.18%of the surface water,for 58.06%of the ground water.Water chemical properties differ from different strata and water types.