冀东平原第四系地下水化学成因及赋存层位识别研究——以唐山平原区为例  

Hydrochemical genesis and aquifer level identification of the fourth series groundwater in Jidong Plain:A case study of Tangshan Plain area

作　　者：汪洋 唐立强 王昕洲 单强 马丙太 赵德刚 王颖 周一文 李红超 邵思慧 WANG Yang;TANG Liqiang;WANG Xinzhou;SHAN Qiang;MA Bingtai;ZHAO Degang;WANG Ying;ZHOU Yiwen;LI Hongchao;SHAO Sihui(Hebei Key Laboratory of Geological Resources and Environment Monitoring and Protection,Shijiazhuang 050021,China;Hebei Institute of Geo-environment Monitoring,Shijiazhuang 050021,China)

机构地区：[1]河北省地质资源环境监测与保护重点实验室,河北石家庄050021 [2]河北省地质环境监测院,河北石家庄050021

出　　处：《水资源与水工程学报》2024年第5期31-39,共9页Journal of Water Resources and Water Engineering

基　　金：河北省地质资源环境监测与保护重点实验室项目(JCYKT202408、JCYKT202210、JCYKT202303);河北省水资源基础调查项目(13000024P006CA410464R);唐山市平原区浅层地下水重要指标环境背景值调查项目(JLZB-2022-139)。

摘　　要：为明确冀东平原第四系地下水化学成因,科学判断地下水赋存层位,以唐山平原区第四系地下水为研究对象,采用Piper三线图、Gibbs图以及离子组合比等方法,探讨了研究区地下水补给来源、水化学特征及成因机制,并基于Bayes判别法建立研究区地下水赋存层位识别模型。结果表明:研究区自山前向滨海浅层地下水水化学类型由HCO_(3)-Ca·Mg型向Cl-Na型转变,深层地下水水化学类型由HCO_(3)-Ca·Mg型向HCO_(3)-Na型转变;研究区全淡水区浅、深层地下水水化学组分形成的主要控制因素为岩石风化作用,以矿物溶解作用为主导;有咸水区浅层地下水水化学组分形成主要受蒸发浓缩控制机制影响,以蒸发岩溶解作用为主导;有咸水区深层地下水水化学组分的形成以阳离子交替吸附作用为主导;基于Bayes判别法的地下水赋存层位识别模型,能够快速、准确地识别出地下水赋存层位。研究成果可为地下水监测井取水层位的确定提供有效方法和手段,为地下水赋存层位划分标准的制定提供科学基础理论与依据。In order to clarify the hydrochemical genesis and determine the aquifer levels of the fourth series groundwater in the Jidong Plain,the fourth series groundwater in the Tangshan Plain area was selected as the research object.The Piper trilinear diagram,Gibbs diagram,and ion composition ratio methods were used to explore the groundwater recharge sources,hydrochemical characteristics,and genetic mechanisms in the study area.Based on the Bayes discriminant method,a model for identifying the aquifer levels of the groundwater in the study area was established.The results showed that the hydrochemical types of shallow groundwater gradually changed from HCO_(3)-Ca·Mg type in the mountain foot area to Cl-Na type in the coastal area,while the deep groundwater changed from HCO_(3)-Ca·Mg type to HCO_(3)-Na type.The formation of the hydrochemical components in the entire freshwater zone of shallow and deep groundwater in the study area was mainly influenced by rock weathering,with mineral dissolution as the dominant process.However,that in the brackish water zone of shallow groundwater was mainly controlled by evaporation concentration,with evaporite dissolution as the dominant process;and that in the brackish water zone of deep groundwater was mainly controlled by cation exchange adsorption.The aquifer level identification model based on the Bayes discriminant method can quickly and accurately identify the aquifer levels of the groundwater.This model can provide an effective approach for determining the pumping levels of groundwater monitoring wells and serve as a technical support for the formulation of aquifer level classification standards.

关 键 词：地下水化学 成因机制 Bayes判别法 赋存层位识别 冀东平原 

分 类 号：TV211.12[水利工程—水文学及水资源] P641.3[天文地球—地质矿产勘探]