Hydrogeochemical characteristics of groundwater depression cones in Yinchuan City, Northwest China  

作　　者：SUN Yaqiao QIAN Hui WU Xuehua 

机构地区：[1]School of Environmental Science and Engineering, Chang ＇an University, Xi＇an 710054, China [2]Ningxia Geological Survey, Yinchuan 750000, China

出　　处：《Chinese Journal Of Geochemistry》2007年第4期350-355,共6页中国地球化学学报

摘　　要：Groundwater in Yinchuan City has been heavily over-exploited, thus leading to the formation of depression cones in confined and phreatic groundwater environments. The depression cones have an important influence on the hydrodynamic and hydrochemical fields of groundwaters. The evolution of depression cones was analyzed on the basis of the monitoring data on groundwater level accumulated in the past 14 years. The ratio of rCl-/rCa2+ showed that phreatic water circulation was intensified, and confined groundwater was affected by external factors. Mass balance of Cl- showed confined water mixed with about 11% phreatic water. It is shown that the alternative function of confined water was affected by external factors. At last, the evolution of groundwater hydrochemical field on the basis of groundwater chemical composition showed that phreatic water quality has been improved whereas confined water quality has been deteriorated. Saturation indices of minerals with respect to phreatic and confined waters were calculated by using PHREEQC.Groundwater in Yinchuan City has been heavily over-exploited, thus leading to the formation of depression cones in confined and phreatic groundwater environments. The depression cones have an important influence on the hydrodynamic and hydrochemical fields of groundwaters. The evolution of depression cones was analyzed on the basis of the monitoring data on groundwater level accumulated in the past 14 years. The ratio of rCl^-/rCa^2＋ showed that phreatic water circulation was intensified, and confined groundwater was affected by external factors. Mass balance of Cl^- showed confined water mixed with about 11% phreatic water. It is shown that the alternative function of confined water was affected by external factors. At last, the evolution of groundwater hydrochemical field on the basis of groundwater chemical composition showed that phreatic water quality has been improved whereas confined water quality has been deteriorated. Saturation indices of minerals with respect to phreatic and confined waters were calculated by using PHREEQC.

关 键 词：地下水漏斗 水化学测量 地下水循环 饱和指数 

分 类 号：P641[天文地球—地质矿产勘探]