三塘湖-淖毛湖地区地下水水质评价及PMF溯源解析  

Water quality evaluation and source analysis of groundwater in Santanghu-Naomaohu area

作　　者：白云峰 曾妍妍[1,2,3] 周金龙 BAI Yunfeng;ZENG Yanyan;ZHOU Jinlong(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052;Xinjiang Hydrology and Water Resources Engineering Research Center,Urumqi 830052;Xinjiang Key Laboratory of Water Conservancy Engineering Safety and Water Disaster Prevention,Urumqi 830052)

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052 [2]新疆水文水资源工程技术研究中心,乌鲁木齐830052 [3]新疆水利工程安全与水灾害防治重点实验室,乌鲁木齐830052

出　　处：《环境科学学报》2024年第6期185-192,共8页Acta Scientiae Circumstantiae

基　　金：国家科技基础资源调查专项(No.2021xjkk1000)。

摘　　要：基于三塘湖-淖毛湖地区2022年地下水水质数据,运用描述性统计分析和Durov图开展了地下水水化学特征分析,采用基于熵权的水质指数法分别对潜水、承压水进行水质评价,并结合正定矩阵因子分解模型、Gibbs图、离子比值等方法进行水质影响因素的溯源分析.结果表明:研究区地下水整体为弱碱性淡水,地下水水化学类型主要为HCO_(3)·SO_(4)型.地下水EWQI(基于熵权的水质指数)值为22.57~115.59,潜水和承压水中水质优良的水样占比分别为70.6%和77.8%.研究区地下水化学组分的形成主要受到岩石溶滤-蒸发浓缩(47.2%)、弱碱性水环境(35.2%)和农业活动(17.6%)的影响,其中以蒸发盐岩和硅酸盐岩的溶解作用为主,弱碱性地下水环境促进了阳离子交替吸附作用,导致地下水中盐分不断富集,频繁的农业活动是研究区地下水中NO3-的主要来源.Based on the groundwater quality data of Santanghu-Naomaohu area in 2022,descriptive statistical analysis and Durov diagram were used to study the hydrochemical characteristics of groundwater.The method of entropy weighted water quality index(EWQI)was used to evaluate the water quality of phreatic water and confined groundwater,and the positive matrix factorization model(PMF),Gibbs diagram and ion ratio were used to analyze the traceability of water quality influencing factors.The results showed that the groundwater was weakly alkaline fresh water,and the main hydrochemical type of groundwater was HCO_(3)·SO_(4).The EWQI of groundwater was between 22.57 and 115.59,the proportion of groundwater samples with excellent quality in phreatic water and confined groundwater was 70.6%and 77.8%,respectively.The formation of groundwater chemical components was mainly affected by rock leaching-evaporation concentration(47.2%),weakly alkaline groundwater environment(35.2%)and agricultural activities(17.6%).Among them,the dissolution of evaporite rock and silicate rock was the main factor,the weakly alkaline groundwater environment promoted the cation exchange,resulting in the continuous enrichment of salt in groundwater,and the frequent agricultural activities were the main source of NO3-in groundwater.

关 键 词：地下水 水质评价 溯源解析 三塘湖-淖毛湖地区 

分 类 号：X824[环境科学与工程—环境工程]