水文地质工程地质2017，Vol.44Issue(2)：31-39,9.DOI:10.16030/j.cnki.issn.1000-3665.2017.02.05
银川地区承压水水化学特征及控制因素
Hydrogeochemical characteristics and controlling factors of confined water in Yinchuan
摘要
Abstract
The strong evaporation have made the unconfined water have poor quality in Yinchuan plain,the middle temperate arid region.Confined water is the main water source for the mining of groundwater in Yinchuan City.Spatial analysis of ArcMap,conventional graphical methods,stable isotopic were used to analyze the distribution characteristics of confined water chemistry,and the difference among different aquifers.Then the controlling factors of confined water chemistry were discussed.The results show that the hydrochemical characteristics of unconfined water are significantly different with the two confined water in horizontal and vertical direction.The first and the second confined water have similar changing trends in the horizontal direction,but certain difference exist between them in the vertical direction.In the horizontal direction,the confined water near the west side recharge area has small TDS with the main anion of HCO3-,and the main cation of Mg2+ and Ca2+.The TDS increase eastwards.Around the Yinchuan fault the chief anion are Cl-and SO42-,and the chief cation is Na + The unconfined water,however,has no obvious zoning characteristics in the horizontal direction.In vertical direction,owing to the Yinchuan fault and the head difference between the two layers of confined water,the second confined water may be mixed by deeper layer groundwater,and the first confined water may be mixed by the deeper layer groundwater and unconfined water simultaneously.These make some second layer confined water samples have higher TDS,more Na + and Cl-,and less Ca2 + and HCO3-than the first layer confined water.And some first layer confined water samples have higher TDS than the second layer confined water,and individual samples higher than the unconfined water.These shows that the development of Yinchuan fault throughout the entire confined and unconfined aquifer is significant to the groundwater quality.If excessive exploitation is conducted continually to the confined water,the confined water lever will continued to fall,which will further stimulate the interfusion of the unconfined and deeper layer water eventually lead to the deterioration of the confined water quality.Therefore controlling the excessive exploitation of confined water is significant to sustainable utilization of confined water resources in Yinchuan.关键词
水化学特征/断裂/承压水/混合作用/银川Key words
hydrochemical characteristics/faults/confined water/mixing effect/Yinchuan分类
天文与地球科学引用本文复制引用
李志红,胡伏生,周文生,赵志鹏,王广才,史浙明..银川地区承压水水化学特征及控制因素[J].水文地质工程地质,2017,44(2):31-39,9.基金项目
国家自然科学基金项目(41272269) （41272269）
