Analysis of Hydrochemical Characteristics and Causes of Drinking Water Sources in South China: A Case Study in Zhanjiang City

The evaluation of groundwater environmental quality and the identification recharge sources are very important for utilization. In this study, hydrochemistry isotope analysis methods used to investigate hydrochemical processes in Zhanjiang City. results show that all samples were drawn on left global meteoric water line (GMWL: δD = 8δ18O + 10) local meteorological lines (LMWL1: 8.17δ18O 11.74 LMWL2: 7.50δ18O 6.18), indicating was mainly recharged by precipitation influenced effect evaporation. middle deep confined aquifers, data depleted with depth, there is a relatively weak hydraulic connection between them. addition, compared unconfined groundwater, showed relative depletion, aquifer may be partially from other aquifers. main chemical types Na*Ca-HCO3. There three major natural controlling source ions: silicate weathering, carbonate dissolution, cation exchange reaction. differences physical properties significant. Due anthropogenic activities land-use types, nitrate exceeds standards. geological background City, iron manganese exceed third standard groundwater. exploitation, TDS levels have been increasing. Closed extraction not sustainable, it depleting ancient reserves. This study highlights effectiveness identifying area mode andit significant fully understanding scientifically managing protecting