Hydrochemical Characteristics and Evolution of Groundwater in the Alluvial Plain (Anqing Section) of the Lower Yangtze River Basin: Multivariate Statistical and Inversion Model Analyses

The alluvial plain (Anqing section) of the lower reaches Yangtze River basin is facing increasing groundwater pollution, not only threatening safety drinking water for local residents and sustainable development utilization resources but also ecological security Basin. Therefore, it necessary to conduct a preliminary analysis on hydrochemical characteristics evolution law in this area. This study aimed evaluate potential hydrogeochemical processes affecting quality area by analyzing major ions samples collected 2019. Compositional relationships were determined assess origin solutes confirm predominant controlling various groundwater. Moreover, factors influencing evaluated through factor method, control range each was analyzed using distribution scores. Finally, reverse simulation carried out typical profiles quantitatively analyze process along flow paths. Piper trilinear diagram revealed two prevalent facies, Ca-HCO3 type (phreatic water) Ca-Na-HCO3 (confined water. Based compositional relationships, could be attributed leaching (dissolution rock salt, carbonate, sulfate), evaporation condensation, cation exchange. Four phreatic confined extracted. results are expected help understand effective management resources, provide basic support restoration