洛阳盆地浅层地下水化学特征及其演化特征分析

在系统采集并分析洛阳盆地浅层地下水样品的基础上,综合描述性统计、相关性分析、运用Piper三线图、Gibbs模型以及离子比例系数等方法,对洛阳盆地浅层地下水化学特征及其形成机理进行了分析和探讨。结果表明:HCO~-_3和Ca~(2+)分别是研究区浅层地下水中优势的阴、阳离子;HCO_3-Ca和HCO_3-Ca·Mg型为主要地下水化学类型;浅层地下水TDS和总硬度的平均浓度相对较低,平均值分别为450.5 mg/L和329.3 mg/L。本区浅层地下水化学特征的形成主要受到岩石风化作用的影响,地下水水质成分主要来自于碳酸盐岩和硅酸盐岩等矿物的长期风化溶解。同时,逆向阳离子交换作用也在一定程度上影响着浅层地下水化学的形成。

Hydrochemical Characteristics and Evolution Characteristics of Shallow Groundwater in the Luoyang Basin

Multiple methods, including mathematical statistics, correlation matrices, Piper diagram, Gibbs mode and ionic ratios, were employed to analyze hydrochemical characteristics and formation mechanisms of the shadow groundwater in the Luoyang Basin on the basis of a systematic collection of water samples. The results show that HCO₃^- and Ca²⁺ are the predominant anion and cation of shallow groundwater. The main hydrochemistry types of groundwater are HCO₃-Ca and HCO₃-Ca·Mg types. The concentration of total dissolved solids (TDS) and total hardness are relatively low in shallow groundwater, with averages of 450.5 mg/L and 329.3 mg/L, respectively. The chemical characteristics of shallow groundwater is mainly derived from the rock weathering. The main constituents of groundwater come from long-term weathering and dissolution of minerals such as carbonates and silicates. In addition, the reverse cation exchange also affects the formation process of shallow groundwater in a certain extent.