江苏滨海平原微承压水层位水土体含盐特征及其相关性分析

通过采集测试土样和水样,分析了研究区地下水水化学特征和土体含盐特征。研究表明:江苏滨海平原地区微承压水为海相沉积水,以盐水为主,水化学类型主要为Cl-Na。微承压水盐分主要来自海水。成井层位土体含盐量较高,以弱盐渍土为主,盐渍土类型为氯盐渍土。土中盐分主要来自海水浸渍,且地下水中的Na+与地层中的交换性钙离子、镁离子产生了阳离子交换。土中易溶盐主要指标和地下水主要指标对应呈线性正相关,建立了矿化度和成井层位土体易溶盐各指标的线性回归模型,并采用HYRD1号井进行了验证,效果良好,说明了土体盐度分析在地下水咸化中的指示作用。

Salt characteristics and correlation analysis of soil and water body of micro confined water layer in Jiangsu coastal plain

The authors took soil and water samples, and analyzed the groundwater chemical characteristics and soil salt characteristics in the study area. The results show that the micro-confined water in the coastal plain of Jiangsu is marine sedimentary water, mainly salt water, and the main chemical type is Cl-Na. The salt of micro-confined water mainly comes from sea water. Salt content of suppling period soil is higher, and the soil type is weak saline soil and chlorine saline soil. The salt content in the soil is mainly from seawater immersion, and the Na⁺ in the groundwater and the exchangeable calcium ions in the formation, magnesium ions produced cation exchange. Main indexes of soil and groundwater salinity show a corresponding linear positive correlation. The linear regression model of salinity with each index of suppling period soluble salt was established and verified by the HYRD1 well . Model effect is good, which illustrates the analysis of soil salinity has instructions in water salinization.