The Influence of Groundwater Mineralization on Dynamic Characteristics of Soil Moisture and Salinity in Coastal Dredger Fill

In order to explore the influence of different groundwater mineralization on the dynamic characteristics of soil moisture and salinity in the profile of dredger fill at Shanghai Lingang coastal land, the dynamic changes of soil moisture content, temperature, pH and total soil salinity in different soil layers were simulated when the groundwater mineralization was set to 5 g/L and 10 g/L, respectively under the condition of 0.6 m groundwater level. The results have showed that: ①The depth of groundwater buried in the Lingang area is 0.59 m, the minimum mineralization degree is 2.58 g/L, the maximum value is 17.1 g/L, the average is 5.63 g/L, and there is no significant correlation between the groundwater buried depth and mineralization. ② The groundwater mineralization has a great influence on the water transfer process in the soil column, but has little effect on the total salt amount of the soil column. However, soil EC values in different treatments show significant differences. ③Different salinity solutions prepared with sodium chloride has no significant effect on the pH of the soil column. Soil salt will gradually accumulate to the surface soil with the transfer of soil moisture. The greater the concentration of the soil solution, the more salt gathered in the surface of soil column. ④ Soil salt can be fitted through a linear equation by soil moisture, soil temperature and soil pH under the indoor simulation conditions. The research results can provide a reference for the dynamic regulation of soil water and soil salinity in the soil profile of coastal dredger fill under different groundwater mineralization conditions.