Laboratory simulation and analysis on the salt migration process of coastal reclaimed land
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Abstract:
In the semi-humid climate, the surface soil of coastal reclaimed land is faced with a complicated salinization problem. To investigate the formation mechanism of saline soil in coastal reclaimed land, we studied the salt migration process under the joint action of phreatic evaporation and lateral interflow. The results showed that the initial salt type in the surface soil is CaSO4, and it gradually transitions to CaCl2 and NaCl in the salt accumulation process. Under the action of terrestrial seepage, a stable wetting front moves to the coast while the water table rises. The area above the free water surface is in a salt accumulation state, with CaCl2 and MgSO4 as primary salt types. The area below the free water surface is in a state of desalination, with CaCl2 and NaCl as primary salt types. Water and salt movement will change the pH value of the soil environment. The pH value will first increase and then decline as the salt content increases. Under the condition of terrestrial groundwater recharge, the salinization prevention and control work in coastal reclaimed land should focus on areas with underground water barriers or densely distributed building foundations.
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