内陆平原区地下水系统中黏土的阻滞作用  

The Role of Clay in Retarding Solute Transport in Inshore Aquifers

作　　者：杨奕[1] 邢立亭[1] 李常锁 张文静[1] 黄林显[1] YANG Yi;XING Liting;LI Changsuo;ZHANG Wenjing;HUANG Linxian(School of Resource and Environment, University of Jinan, Ji＇nan 250022, China;Shandong Province Geotechnical Engineering Investigation Institute, Ji＇nan 250014, China)

机构地区：[1]济南大学资源与环境学院,济南250022 [2]山东省地矿工程勘察院,济南250014

出　　处：《灌溉排水学报》2018年第7期91-98,共8页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(41172222;41472216;41772257)

摘　　要：【目的】深化认识咸淡水水质演化过程中的水文地球化学作用。【方法】以内陆平原区为例,在研究区水文地质调查的基础上,通过地质钻探和抽水试验采集不同深度的原状土与地下咸水,采用野外水质实时监测、室内吸附等温试验、因子分析、相关性分析等方法,分析了黏土的阻滞作用对地下水水化学特征的影响。【结果】黏土对地下水中Na^+、Ca^(2+)、Mg^(2+)的最优吸附等温曲线符合Henry方程、Langmuir方程;受黏土矿物种类及其质量分数的影响,不同深度的黏土对地下水中Na^+(Ca^(2+)、Mg^(2+))的阻滞强度不同,一定深度的黏土对地下水中Na^+的阻滞最强,高于对Ca^(2+)和Mg^(2+)的。【结论】黏土的阻滞作用对地下水系统中的水化学分带及地下水系统中微咸水的形成有重要影响。【Objective】Hydro-geochemistry of groundwater is controlled by the minerals of the aquifer and the purpose of this paper is to study the role of clay in modulating the salinity of an inshore aquifer.【Method】Clay and saline groundwater samples were taken from different depths via drilling and pumping tests in hydrogeological investigations of an inshore aquifer. The impact of clay content on retardation of chemical transport was investigated by real-time monitoring groundwater quality, isothermal adsorption measurement, factor analysis and correlation analysis.【Result】The isothermal adsorption of Na^＋, Ca^2＋, Mg^2＋to the clay in the aquifer can be fitted to the Henry formula and the Langmuir formula. The retardation of Na^＋, Ca^2＋and Mg^2＋by the clay changed along the depth due to the variations in the minerals types and minerals contents, with Na＋adsorption much stronger than Ca^2＋ and Mg^2＋.【Conclusion】Retardation of the three ions by the clay affects the formation of chemical zonation and salinity of the groundwater.

关 键 词：黏土 吸附等温方程 阻滞作用 地下水水化学成分 内陆平原区 

分 类 号：P641.3[天文地球—地质矿产勘探]