Assessment of Pleistocene Aquifer Vulnerability to Saline Intrusion in the Coastal Region of Ba Ria-Vung Tau Province Using GIS and Entropy-GALDIT

Sea-level rise, in the context of climate change, increases likelihood seawater intruding into coastal aquifers. This study assesses vulnerability Pleistocene aquifer area Ba Ria-Vung Tau province, Vietnam. Data for calculation and analysis were collected from 99 boreholes area. Using assessment index (GALDIT) with expanded weights, to influence coastlines was evaluated visualized a GIS environment. The set Entropy weights used clearly shows significance component parameters indicates characteristics risk partitioning salinization. Entropy-GALDIT results divided province three levels vulnerability: high zones (3.88% area), medium (55.47%), low (40.65%). According GALDIT susceptibility zoning map, western Phu My town (along Thi Vai River), southwest region Vung City, southeast Dat Do District are highly sensitive not recommended any purpose. result provides useful insights aquifers respect factors such as height groundwater level above sea level, distance shore wells, impact existing intrusion. Accordingly, it is necessary establish monitoring systems warn saltwater intrusion develop integrated resource management strategies ensure sustainability resources