天台盆地浅层地下水水化学特征及成因分析

Hydrochemical Characteristics and Genesis Analysis of Shallow Groundwater in Tiantai Basin

以天台盆地为研究区,采集浅层地下水和地表水样品并检测其化学成分,通过水化学统计分析、离子比值等方法,重点探讨浅层地下水的水化学特征及成因。结果表明,研究区水化学类型以HCO_(3)-Ca型、HCO_(3)-Ca·Na型为主;离子成分具空间分异性,呈现HCO_(3)^(-)、Ca^(2+)、Na^(+)、Cl^(-)浓度周围低中间高,NO_(3)^(-)和SO_(4)^(2-)浓度西北部较高特征;浅层地下水化学成分受岩石风化及人类活动影响,主要离子主要来源于硅酸盐矿物溶解作用,并受农业活动和生活污水排放影响。开展天台盆地地下水水化学特征及成因的综合研究可以为水资源的保护及利用提供基础数据支撑。

Taking the Tiantai Basin as the research area,shallow groundwater and surface water samples were collected and their chemical compositions were detected.The hydrochemical characteristics and genesis of shallow groundwater were discussed by means of hydrochemical statistical analysis and ion ratio.The results showed that the hydrochemical types in the study area are mainly HCO_(3)-Ca type and HCO_(3)-Ca·Na type.The concentration of HCO_(3)^(-)、Ca^(2+)、Na^(+)、Cl^(-)was lower in the surrounding area and higher in the middle area,and the concentration of HCO_(3)^(-) and SO_(4)^(2-)was higher in the northwest area.The chemical composition of shallow groundwater was affected by rock weathering and human activities.The main ions were mainly derived from the dissolution of silicate minerals,and were affected by agricultural activities and domestic sewage discharge.The comprehensive study on the hydrochemical characteristics and genesis of groundwater in Tiantai Basin can provide basic data support for the protection and utilization of water resources.