四川环境2026，Vol.45Issue(4)：20-30,11.DOI:10.14034/j.cnki.schj.2026.04.004
拉萨市地下水水化学特征及来源解析
Hydrochemical Characteristics and Source Apportionment of Groundwater in Lhasa City
吴攸 1余东 2刘瀚霜 2陈美娟 3程燕3
作者信息
- 1. 西安交通大学人居环境与建筑工程学院,陕西西安 710049||成都理工大学地质灾害防治与地质环境保护全国重点实验室,四川成都 610059
- 2. 成都理工大学地质灾害防治与地质环境保护全国重点实验室,四川成都 610059
- 3. 西安交通大学人居环境与建筑工程学院,陕西西安 710049
- 折叠
摘要
Abstract
To systematically reveal the hydrochemical characteristics and genetic mechanisms of groundwater in a semi-arid valley city on the plateau,water quality data from 347 groundwater monitoring wells in Lhasa were utilized in this study.Piper trilinear diagrams,Gibbs diagrams,and ion ratio plots were constructed,and analyses were conducted using the Positive Matrix Factorization(PMF)model and the Entropy-weighted Water Quality Index(EWQI)to investigate the hydrochemical characteristics,genetic mechanisms,and drinking suitability of the groundwater.The results showed that the groundwater in the study area was generally weakly alkaline,with a mean TDS of 238.55 mg/L,classified as low-salinity freshwater.The hydrochemical facies were predominantly Ca-Mg-HCO3 type or Ca-Mg-HCO3-SO4 type.The solute composition of the groundwater was primarily controlled by rock weathering,with carbonate rock dissolution serving as the main source of Ca2+and HCO3-,while evaporite dissolution and evaporative concentration promoted the enrichment of SO42-,Cl-,and Na+.Four potential sources were identified by the PMF model,among which the coupled contribution of natural processes and anthropogenic activities was the highest(34.66％).The EWQI results indicated that 99.7％of the samples were categorized as Class Ⅰ(excellent quality)water.This study provides a scientific basis for the protection and refined management of groundwater resources in plateau cities.关键词
拉萨市/地下水/水化学特征/PMF源解析/EWQIKey words
Lhasa City/groundwater/hydrochemical characteristics/PMF source apportionment/EWQI分类
资源环境引用本文复制引用
吴攸,余东,刘瀚霜,陈美娟,程燕..拉萨市地下水水化学特征及来源解析[J].四川环境,2026,45(4):20-30,11.
