Simulation studies on the water and salt transportation along the seawater intrusion-soil salinization disaster chain of silty coasts
QI Chen
XIONG Guiyao
LI Chenzhe
FU Yushan
ZHANG Yufeng
DONG Minxing
FU Tengfei
LI Bin
Abstract：The dynamic changes caused by climate change and anthropogenic activities have induced a variety of groundwater environmental problems,as well as a series of environmental and geological haz-ards in the coastal zone.Meanwhile,the seawater intrusion and the accompanying process of soil salin-ization are of great concerns.Clarifying the water and salt transportation pattern during the occurrence of seawater intrusion-soil salinization disaster chain is crucial for the prevention and control of this envi-ronmental geohazard.In this study,we simulated the seawater intrusion process on the silty coasts and characterized the water-salt transportation law during the disaster chain with the high-density resistivity method.The results showed that the invasion speed,distance and area increased with the increase of hydraulic gradient.When the depth of groundwater is shallow,the saltwater intrusion has an obvious exacerbating effect on the accumulation of salts in the overlying soil,resulting in a salt peak in the soil profile.The salt peak moves upwards under the capillary action,easily leading to soil salinization.In the process of freshwater replacement of salt water,freshwater firstly replaces the saline water in the upper soil layer of the sediment layer,resulting in salt peak,which then moves downwards and gradu-ally disappears.In summary,water storage should be enhanced to increase the infiltration of surface water during the wet season,and water exploration should be slowed down to reduce the groundwater gradient during the dry season in order to prevent the occurrence of the saltwater intrusion-soil saliniza-tion disaster chain.
Keywords：seawater intrusionsoil salinizationdisaster chainhigh density electrical methodwater-salt transportation
Publication Date：2025-12-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：9( 166-174 )