银川平原不同深度地下水化学演化特征研究  

Hydrochemical Evolution Characteristics of Groundwater at Different Depths in the Yinchuan Plain

作　　者：方磊 杨凡 赵志鹏 杨丽虎[2,3] 徐兆祥 姚东绪 王成文 张勃 FANG Lei;YANG Fan;ZHAO Zhipeng;YANG Lihu;XU Zhaoxiang;YAO Dongxu;WANG Chengwen;ZHANG Bo(Hydrological Processes and Ecological Responses in Northern Plain Ningxia Observation and Research Station,Institute of Hydrogeology and Environmental Geology of Ningxia,Yinchuan 750011,China;Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;School of Resources and Environment,University of Chinese Academy of Sciences,Beijing 101400,China)

机构地区：[1]宁夏回族自治区水文环境地质调查院北部平原区水文过程与生态效应宁夏野外科学观测研究站,宁夏银川750011 [2]中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京100101 [3]中国科学院大学资源与环境学院,北京101400

出　　处：《人民黄河》2024年第11期99-105,113,共8页Yellow River

基　　金：宁夏生态地质调查示范项目(NXCZ2022201);宁夏科技基础建设项目(2023KXGC004);宁夏腾格里湖与湖岸带地下水转化关系研究项目(2023AAC03785)。

摘　　要：为探明银川平原不同深度(5~600 m)地下水化学特征及演化过程,采用地下水位动态分析方法、Person相关性分析、饱和指数和水化学方法(Piper图、Gibbs图、离子比例系数)对银川平原不同深度地下水化学特征和同位素特征进行了系统分析,并采用氚和^(14)C定年方法估算了浅层(5~30 m)和深层(150~600 m)地下水的年龄。结果表明:研究区5~30 m浅层地下水化学类型为Cl·SO_(4)-Na·Mg、SO_(4)·Cl·HCO_(3)-Na·Mg型,主要受蒸发浓缩作用影响,150~300 m、400~600 m深层地下水均为HCO_(3)·CO_(3)-Na·Mg、HCO_(3)-Na·Mg型,受岩石风化作用控制;5~30 m浅层地下水主要受引黄灌溉水补给,地下水年龄9~>68 a,150~600 m深层地下水来源于西部山区,年龄为7325~25554 a B.P.;地下水中离子主要来自碳酸盐岩、蒸发盐岩、硅酸盐岩的溶解,阳离子交换作用也影响地下水中化学组分的变化。In order to explore the hydrochemical characteristics and evolution process of groundwater at different depths(5-600 m)in the Yinchuan Plain,a systematic analysis was conducted on the hydrochemical and isotopic characteristics of groundwater at 9 different depths in the study area by using groundwater level dynamics,Person correlation analysis,saturation index,and hydrochemical methods(Piper plot,Gibbs plot and ion ratio coefficient).Besides,the tritium and ^(14)C dating methods were used to estimate the ages of shallow(5-30 m)and deep groundwater(150-600 m).The results indicate that the chemical types of shallow groundwater in the study area are Cl·SO_(4)-Na·Mg or SO_(4)·Cl·HCO_(3)-Na·Mg,which are mainly affected by evaporation and fractional crystallization.Deep groundwater in 150-300 m and 400-600 m is HCO_(3)·CO_(3)-Na·Mg or HCO_(3)-Na·Mg,which are controlled by rock weathering.Isotopes indicate that shallow groundwater is significantly recharged by irrigation water,with groundwater ages ranging from 9 a to>68 a.Deep groundwater in 150-600 m originated from the western mountainous areas,with ages ranging from 7325 a to 25554 a.The ion ratio coefficient method and saturation index indicate that ions in groundwater mainly comes from weathering and dissolution of carbonate,evaporite,and silicate rocks.Cation exchange also affects the changes in chemical components in groundwater.

关 键 词：地下水动态 水化学特征 同位素 离子比例系数 银川平原 

分 类 号：TV211.12[水利工程—水文学及水资源]