吉林省长岭县浅层地下水水文地球化学演化规律分析

Analysis of evolution law of hydrology and geochemistry of shallow groundwater in Changling county of Jilin Province

开展地下水水文地球化学形成演化机制的研究,对水质评价和水资源合理利用具有重要意义。本文利用吉林省长岭县1981-2003年间潜水和承压水的水质分析结果,采用水文地球化学方法研究了区内地下水的水文地球化学作用及水质演化规律。选取198个水质监测点进行分析、处理,运用Piper三线图解法、Gibbs图解法、离子比值分析法对吉林省长岭县地下水水文地球化学形成演化机制进行研究。研究结果表明:研究区地下水主要受到阳离子交换作用和岩盐溶解作用影响,其阴离子以HCO-3为主,阳离子以Ca2+和Na+为主,地下水偏弱碱性,硬度较大。研究区潜水水化学类型以HCO3—Ca为主,承压水水化学类型以HCO3—Na为主,地下水水化学类型较稳定,地下水水质受人为因素影响较小。

The paper studied the formation and evolution mechanism of hydro-geochemistry of groundwater,which is important for the assessment of water quality and the sustainable utilization of water resources. It used the analysis results in unconfined aquifer and confined aquifer from 1981 to 2003 in Changling county,and analyzed the effect of hydro-geochemistry of groundwater and evolution law of water quality. The paper collected 198 monitoring points of water quality so as to analyze and deal with,and used Piper graphic method,Gibbs graphic method and ion ratio analysis method to research. The results demonstrate that the groundwater is mainly affected by cation exchange function and halite dissolution,among that anions HCO3^- are the dominant components of water and the cations are Ca^2 ＋and Na^＋. The groundwater has the property of alkalescence and high hardness. The dominant hydro-chemistry type of water is HCO3—Ca in the unconfined aquifer,whereas that is HCO3—Na in the confined aquifer. The hydro-chemistry type of groundwater is more stable. The water quality is less affected by human activities.