保定平原区地下水化学特征及演化  

Chemical characteristics and evolution of groundwater in Baoding Plain

作　　者：白华 杨会峰[1,2] 孟瑞芳 徐步云[4] 闫晓雪 BAI Hua;YANG Huifeng;MENG Ruifang;XU Buyun;YAN Xiaoxue(The Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Science,Shijiazhuang,050061;National Field Scientific Observation and Research Station on Groundwater and Ground Subsidence in the Plain Area of Cangzhou,Hebei,050061;China University of Geosciences(CUG),Wuhan,430074)

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061 [2]河北沧州平原区地下水与地面沉降国家野外科学观测研究站,石家庄050061 [3]中国地质大学,武汉430074 [4]中国地质大学,北京100083

出　　处：《地质论评》2023年第6期2216-2228,共13页Geological Review

基　　金：中国地质调查局地质调查项目(编号:DD20221752);中国地质科学院科研业务费项目(编号:SK202118、SK202216、KY202301)的成果。

摘　　要：为揭示保定平原地下水水化学特征及演化规律,本文以保定平原为研究对象,对216组地下水样水化学特征进行了分析。综合运用Piper三线图、Gibbs图、相关离子分析等方法,研究了保定平原区深浅层地下水化学组成及水化学类型空间分布特征,识别了水化学形成机制与控制作用,在此基础上分析了水化学演化的成因。结果表明:沿地下水径流方向,浅层地下水与深层地下水主要离子含量呈现明显的递变规律,TDS、Na^(+)、Mg^(2+)、Cl^(-)、SO_(4)^(2-)、HCO_(3)^(-)含量逐渐升高,K^(+)、Ca^(2+)逐渐降低,地下水优势阳离子Ca^(2+)主导地位逐渐被Na^(+)代替,优势阴离子HCO_(3)^(-)主导地位逐渐向Cl^(-)过渡。地下水化学特征主要受水岩作用、阳离子交替吸附作用以及人类活动共同影响,水岩作用以碳酸盐岩和铝硅酸盐岩共同溶滤作用为主;浅层地下水受人类活动影响较大,影响离子主要为NO-3,集中分布于补给区,除了与农业活动相关外,主要与山前平原岩性颗粒粗,具有较强的渗透性有关。Objectives:In order to reveal the hydrochemical characteristics and evolution law of groundwater in Baoding Plain,this paper takes Baoding Plain as the research object,and analyzes the hydrochemical characteristics of 216 groups of groundwater samples.Methods:This paper used Piper triplot,Gibbs plot,correlation ion analysis methods to study the chemical composition and spatial distribution characteristics and water chemical types of deep and shallow groundwater in Baoding Plain.The formation mechanism and control of water chemistry were identified,and the causes of water chemical evolution were analyzed on this basis.Results:The results are as follows.Along the direction of groundwater runoff,the content of main ions in shallow groundwater and deep groundwater showed an obvious gradient law.TDS,Na^(+),Mg^(2+),Cl^(-),SO_(4)^(2-)and HCO_(3)^(-)contents gradually increased,while K^(+)and Ca^(2+)gradually decreased.The dominant cation Ca^(2+)was gradually replaced by Na^(+),and the dominant anion HCO_(3)^(-)gradually shifted to Cl^(-).The chemical characteristics of groundwater are mainly affected by water—rock interaction,alternating cation adsorption and human activities.Conclusions:The water—rock interaction is mainly caused by the co-filtration of carbonate rocks and aluminosilicate rocks.The shallow groundwater greatly affected by human activities is concentrated in the recharge area,and NO-3 is the main ion affected.It is related to agricultural activities and strong permeability of Coarser lithologic particles in Piedmont alluvial plain.

关 键 词：保定平原区 水化学特征 水化学演化 水化学类型 

分 类 号：P641.3[天文地球—地质矿产勘探]