HGS RESEARCH HIGHLIGHT – The effects of land subsidence and its mitigating measures on shallow groundwater salinization in the low-lying coastal plain of East Japan

The research investigates how land subsidence and mitigation measures, specifically pumping stations and ditch systems in Shirako Town, Japan's lower Nabaki River region, interact. Land subsidence, caused by natural and human factors, heightens flood risks in coastal areas, challenging infrastructure stability and environmental sustainability. While pumping stations and ditches aim to manage surface water levels and reduce floods, their impact on groundwater salinity near tidal rivers is unclear. Using a coupled surface-subsurface model, the study reveals potential risks like saline water intrusion into groundwater.