浅层地下水水化学特征与土体盐分相关性研究

为研究南通地区浅层地下水与土体盐分特征的相关性,采集了31件水样、220件土样,并收集了60组水质资料,分析了浅层地下水水化学特征和土体盐分特征.研究表明:浅层地下水自西向东,TDS逐渐增大,主要为咸水和盐水,水化学类型为Cl—Na型,TDS与各离子(K+、Na+、Ca2+、Mg2+、Cl-、SO42-)的相关性高;土...

Correlation between shallow groundwater hydrochemical characteristics and soil salinity

In order to study the correlation between the shallow groundwater and soil salinity in Nantong area, 31 water samples, 220 soil samples and 60 groups of water quality data were collected to analyse the characteristics of the shallow groundwater and soil salts. The results show that the total dissolved solids (TDS) in the shallow groundwater increases gradually from west to east which is highly correlated with the ions in the water (K⁺, Na⁺, Ca²⁺, Mg²⁺, Cl^-, SO₄^2-), and the groundwater is mainly constituted of Cl^- Na type salty water and saline water. The salt content of the soil is basically similar to that of the groundwater, which increases gradually from west to east and also increases gradually with the depth of the soil. The saline soil type is chloride saline soil, dominated by weak saline soil, indicating that the salts in the soil mainly come from the groundwater. The TDS of the groundwater is highly correlated with the total soil salts and the ions (K⁺, Na⁺, Ca²⁺, Mg²⁺, Cl^-, SO₄^2-). Based on these findings, several linear prediction models of TDS and soil salinity were established. With these models, thepredicted average correlation coefficient can reach up to 0.839, and the average prediction accuracy reaches 88.93%, demonstrating the excellent performance of the models. This presents a new approach to finding out the TDS content in the groundwater from soil samples, which saves the cost of drilling wells.