白浪河流域地下水化学特征及其控制因素

白浪河流域北部平原第四系含水层中含有高浓度的卤水,近年来有南侵的趋势,影响了南部平原区的供水安全,正确认识白浪河流域平原区地下水的水化学特征及其成因,对于合理管理地下水资源、保障供水安全具有重要意义.以前人研究为基础,通过在白浪河流域采取地下水化学样品,运用Piper三线图、Gibbs图、无机离子示踪剂等多种水化学分析...

Hydrochemical characteristics and controlling factors of groundwater in Bailang River catchment

High-concentration brine exists in the northern part of the Bailang River catchment aquifer.In recent years,the brine has flowed southward and potentially impacts the water supply in the southern plain area.Correct understanding of its hydrochemical characteristics and the evolution of Bailang River catchment is important for the reasonable management of groundwater resources and safety of water supply.Based on the previous research results,through groundwater sampling and a variety of hydrochemical analysis,including Piper Diagram,Gibbs Diagram,and inorganic ion tracer,groundwater hydrochemistry characteristics and its controlling factors in both freshwater area and brine area were studied.The total dissolved solids of groundwater in freshwater area and brine area are 1 098.1 and 115 669.3 mg/L,respectively,which indicates that the formation of groundwater chemical composition in the two areas is controlled by different factors.The chemical composition of groundwater in freshwater area is mainly decided by the water-rock interaction.The salt in the brine area comes from three seawater intrudings,but the groundwater in brine area is no longer the original seawater; it has been replaced by new water from precipitation in the southern mountain area under the driving force of the natural hydraulic gradient.The distribution of hydrochemical field is the result of water-salt interaction during the groundwater recharge,runoff,and discharge processes.The main minerals dissolved in the water-salt interaction process are NaCl,MgCl₂,Na₂SO₄,and MgSO₄.