摘要
为了研究永定河平原区河段生态补水不同水源对研究区浅层地下水水质影响,开展生态补水对浅层地下水水质影响研究非常必要。以永定河平原区河段为研究区,使用水均衡等方法对研究区浅层地下水进行分析研究,识别主要水文地球化学作用,探讨生态补水过程中永定河流域平原区地下水水质的演变机理。分析结果表明:在2019—2021年之间,地下水中主要离子浓度在上游河段总体呈升高趋势,而在下游总体呈下降趋势;各水源主要阴阳离子不同,引黄水主要阴阳离子分别为HCO_(3)^(-)和Na^(+),南水北调水主要阴阳离子分别为HCO_(3)^(-)和Ca^(2+),再生水小红门主要阴阳离子分别为Cl^(-)和Ca^(2+);地下水水化学特征逐渐从HCO_(3)^(-)Ca·Mg·Na型水向Cl·HCO_(3)^(-)Ca·Na型水转变;永定河生态补水后引起地下水水质变化起主导作用的是混合作用,其次是阳离子交替吸附作用,溶滤作用和蒸发浓缩作用在局部起主导作用。本研究可为生态补水对浅层地下水质影响研究提供借签。
The ecological water replenishment in the plain area of Yongding River is helpful to the restoration of groundwater environment in Yongding River Basin,but the replenishment of different water sources also has a certain impact on groundwater quality.In order to study the influence of different water sources on the quality of shallow groundwater in the study area,it is necessary to study the influence of ecological water replenishment on the quality of shallow groundwater.In this paper,the river section of Yongding River Plain was taken as the research area,and the shallow groundwater was analyzed by means of water balance.The main hydrogeochemical effects were identified,and the evolution mechanism of groundwater quality in the plain area of Yongding River Basin during the process of ecological water replenishment was discussed.The analysis results show that:Between 2019 and 2021,the concentration of major ions in groundwater shows an overall upward trend in the upstream river section,while it shows a downward trend in the downstream river section;The main anions and cations of each water source are different.The main anions and cations of the Yellow River water are HCO;and Nat,respectively.The main anions and cations of the South-to-North Water Diversion water are HCO_(3)^(-)and Ca^(2+),respectively.The main anions and cations of the reclaimed water are Cl^(-)·and Ca^(2+),respectively;The hydrochemical characteristics of groundwater gradually changed from HCO_(3)^(-)Ca·Mg·Na type water to Cl·HCO_(3)^(-)Ca·Na type water.The mixing effect plays a leading role in the change of groundwater quality after the ecological water replenishment of Yongding River,followed by the alternating adsorption of cations.In addition,the leaching effect and evaporation concentration play a leading role in the local area.
作者
库·阿英格
张佳
孙春媛
张辉
KU Ayingge;ZHANG Jia;SUN Chunyuan;ZHANG Hui(China University of Geosciences(Beijing),Beijing 100083,China;Beijing Hydrological Monitoring Centre,Beijing 100089,China;Beijing Normal University,Beijing 100875,China)
出处
《北京水务》
2022年第S02期26-33,共8页
Beijing Water
关键词
永定河
生态补水
浅层地下水
水质
水岩相互作用
Yongding river
ecological water replenishment
shallow groundwater
water quality
waterrock interaction
