牟汶河中上游河水离子组成特征及其影响因素

为研究牟汶河中上游河水化学特征,分析河水离子来源,采集21组干流和支流河水样品,利用数理统计、Piper三线图及沿流程组分变化图分析主要离子组分、水化学类型及水化学空间变化特征;利用Gibbs图和离子比值相关性分析水化学组分控制因素。结果表明,河水离子组分以Ca²⁺、Na⁺、Mg²⁺、SO₄^2-、HCO₃^-、Cl^-为主;干流水化学类型主要为SO₄·Cl-Ca·Na型,支流水化学类型主要为HCO₃·SO₄-Ca·Mg型;河水水化学组分除来自碳酸盐矿物和硅铝酸盐矿物的风化溶解贡献外,牟汶河支流瀛汶河水受农业活动影响,干流及其他支流河水受工矿活动影响;大气降水对区内河水水化学组分影响较小。

Ionic Composition Characteristics and Their Controlling Factors of River Water in the Middle and Upper Reaches of Muwenhe River

In order to study the chemical characteristics of the water in the middle and upper reaches of the Muwenhe River and analyze the source of river water ions,21 groups of river samples were collected from the main and branch rivers.The mathematical statistics,Piper diagram and component change chart along the process were used to analyze the main ion components,hydrochemistry types and spatial change characteristics of hydrochemistry.The Gibbs map and ion ratio correlation chart were used to analyze water chemical composition control factors.The results show that the Ca²⁺、Na⁺、Mg²⁺、SO₄^2-、HCO₃^-、Cl-are the main ion components of river water.The type of main stream river water chemistry is SO₄·Cl-Ca·Na,and the type of branch stream water chemistry is HCO₃·SO₄-Ca·Mg.The hydrochemical components of river water come from the weathering and dissolution contributions of carbonate minerals and aluminosilicate minerals.In addition,Yingwenhe River,a branch of Muwenhe River,is affected by agricultural activities,while the main and other branch rivers are affected by the industrial and mining activities.In comparison,atmospheric precipitation has little impact on the hydrochemical composition of river water in the area.