广汉市平原区浅层地下水化学演化及其控制因素

发布时间：2018-05-01 11:04

本文选题：广汉市 + 水化学演化　；参考：《吉林大学学报(地球科学版)》2016年03期

【摘要】：为在广汉市城乡规划过程中提供地下水资源开发利用的基础信息,采用矿物风化系统分析、相关性分析、主成分分析和PhreeQC反向水文地球化学模拟等方法对广汉市平原区的浅层地下水的地下水水化学组分进行分析,确定了浅层地下水的水化学演化及控制因素,完成了地下水资源的质量及时空分布特征分析。分析表明:Gibbs图显示岩石风化主导该区地下水水化学特征,风化过程产生离子和次生矿物又经历水解作用,在矿物风化系统稳定场图中显示水样中铝硅酸盐矿物逐渐趋于溶解,碳酸盐矿物处于饱和状态;PhreeQC反向水文地球化学模拟结果显示在水流模拟路径上主要发生了钙蒙脱石、钾长石溶解和高岭石、石英、钠长石的沉淀,以及Ca-Na_2之间的阳离子交换吸附作用;离子相关性和主成分分析进一步的验证了溶滤作用、蒸发浓缩作用和阳离子交换吸附作用是引起浅层地下水水化学过程和矿物组成改变的主要原因。研究区地下水水质总体不会对人体健康造成不良影响。
[Abstract]:In order to provide basic information for the development and utilization of groundwater resources in the process of urban and rural planning in Guanghan City, the mineral weathering system analysis and correlation analysis are used. Principal component analysis (PCA) and PhreeQC inverse hydrogeochemical simulation are used to analyze the chemical composition of groundwater in shallow groundwater in Guanghan Plain area, and the hydrochemical evolution and controlling factors of shallow groundwater are determined. The quality and temporal and spatial distribution of groundwater resources are analyzed. The analysis shows that rock weathering dominates the hydrochemical characteristics of groundwater in this area, and the anion and secondary minerals are hydrolyzed during the weathering process, and the aluminosilicate minerals tend to dissolve in the water samples in the stable field diagram of the mineral weathering system. The results of reverse hydrogeochemical simulation of carbonate minerals in saturated state show that there are mainly calcium montmorillonite, potassium feldspar dissolution and precipitation of kaolinite, quartz and albite on the flow simulation path. The cation exchange and adsorption between Ca-Na_2, ion correlation and principal component analysis further verify the dissolution and filtration, Evaporation concentration and cation exchange adsorption are the main reasons for the change of hydrochemical process and mineral composition of shallow groundwater. The groundwater quality in the study area is not harmful to human health.
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2009Z006) 四川省科技厅科技支撑计划项目(2011SZ0172)~~
【分类号】：P641.3

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