地质通报2025，Vol.44Issue(5)：811-824,14.DOI:10.12097/gbc.2024.11.058
陕西泾阳南部地下水水文地球化学成因机制及次生环境挑战
Hydrogeochemical genesis mechanism and secondary environmental challenges of groundwater in southern Jingyang,Shaanxi Province
摘要
Abstract
[Objective]The southern Jingyang,Shaanxi Province is a typical loess distribution area,population gathering area,agricultural activity intensive area,and geological disaster prone area.Thus,studying the hydrogeochemical genesis mechanism and secondary environmental challenges of groundwater in this area is of great significance for the development and utilization of groundwater resources,water safety guarantee,and ecological geological environment protection on the Chinese Loess Plateau.[Methods]Based on groundwater investigation,water sample collection and analysis in the area,the main ion distribution characteristics of groundwater were identified;the hydrogeochemical genesis mechanism and its main controlling factors of groundwater were revealed by the comprehensive application of hydrochemical methods and isotope theory;the suitability of groundwater for drinking and irrigation was evaluated,and its secondary environmental challenges were explained,using the integrated-weight water quality index,magnesium hazard,soluble sodium percentage,Wilcox plot,and irrigation coefficient.[Results]The groundwater in this area was weakly alkaline as a whole.The TDS range of groundwater in the south bank of Jing River was 752～2108 mg/L,belonging to freshwater and brackish water,while the TDS ranged from 1232 to 3768 mg/L and was classified as brackish to saline water in the north bank.The dominant cations in groundwater were Na+and Mg2+,and the dominant anions were HCO3-and SO42-;The hydrochemical types were mainly HCO3·SO4-Na·Mg and HCO3·SO4·Cl-Na·Mg,and the hydrochemical types in the north bank were more complex.The hydrochemical characteristics of groundwater were mainly controlled by rock weathering,among which the weathering and dissolution of silicate rocks were dominant.Meanwhile,the evaporation and cation alternating adsorption promoted the salinization of groundwater.The groundwater in the south bank was significantly affected by agricultural activities,while the groundwater in the north bank was influenced by a combination of industrial activities,domestic sewage,and human and animal manure.The drinking water quality level was mainly moderate,and the primary factors causing health risks were total hardness,NO3-,F-,and SO42-.Most groundwater was not suitable for direct irrigation and measures should be taken to prevent salt accumulation,otherwise soil salinization may occur.[Conclusions]The hydrochemical characteristics of groundwater along the banks of Jing River in the south of Jingyang,Shaanxi Province,are mainly controlled by the weathering of silicate rocks,superimposed evaporation and concentration and the influence of human activities.There are health risk factors of groundwater such as total hardness,nitrate,fluoride exceeding the standard,and the salinization of groundwater is easy to induce soil salinization.It is suggested to carry out targeted prevention and control of groundwater pollution to avoid facing more severe secondary environmental challenges.关键词
地下水/水化学/同位素/水文地球化学过程/水质评价/泾阳南部/陕西Key words
groundwater/hydrochemistry/isotope/hydrochemical processes/water quality assessment/southern Jingyang/Shaanxi Province分类
天文与地球科学引用本文复制引用
徐盼盼,钱会,张奇莹,臧永琪,刘源,董佳毅..陕西泾阳南部地下水水文地球化学成因机制及次生环境挑战[J].地质通报,2025,44(5):811-824,14.基金项目
国家自然科学基金项目《渗流-化学协同作用下黄土微结构演化与强度特性响应研究》(批准号:42202311)、西安市青年人才托举计划项目《渗流条件下黄土的水-土耦合作用机制及其损伤灾变效应研究》(编号:959202313095)和大学生创新创业训练计划项目《黄土-古土壤界面渗透特性与微观机理研究》(编号:S202410710325) （批准号:42202311）
