Imaging the extent of salt water intrusion in the Luy river coastal aquifer (Binh Thuan) using electrical resistivity tomograph (ERT)
| Meeting | VIWC2026 |
| Topic | OS13: Groundwater for Sustainable Development |
| Author | Diep Thi CONG | Linh Dieu PHAM | Robin THIBAUT | Frédéric NGUYEN | Marieke PAEPEN | Hieu Huu HO | Thomas HERMANS |
| Organization | Deputy Head of Department of Marine Geology Vietnam Institute of Geosciences and Mineral Resources | Department of Marine Geology Vietnam Institute of Geosciences and Mineral Resources 67 Chien Thang, Van Quan, Ha Dong, Hanoi, Vietnam | PhD Student Department of Geology Laboratory for Applied Geology and Hydrogeology Krijgslaan 281, Bldg S8, 9000 Gent, Belgium | Professor Department of Urban and Environmental Engineering Engineering School University of Liege Department of Civil Engineering Engineering School KU Leuven | PhD student Department of Geology Krijgslaan 281, S8, 9000 Gent, Belgium | Department of Marine Geology Vietnam Institute of Geosciences and Mineral Resources | Assistant Professor Department of Geology Laboratory for Applied Geology and Hydrogeology Krijgslaan 281, Bldg S8, 9000 Gent, Belgium |
| DOI | 2022.1669999242 |
Abstract
| Binh Thuan is one of the driest provinces in Vietnam. During the dry season, seawater intrudes through estuaries and threatens groundwater resources. The latter are under increasing pressure due to water extraction for agri- and aqua- culture. To evaluate the current state of salinity in the aquifers, electrical resistivity tomography (ERT) measurements were collected along the downstream part of the Luy river. 21 profiles were collected in July-August 2019 based on the previous saltwater intrusion boundary which was estimated from water samples collected from shallow boreholes in the area. The data were processed to get the resistivity distribution of the subsurface. The results show that resistivity zones lower than 10 Ohm.m and corresponding to saltwater dominate in lowland areas with almost the entire thickness of the aquifer filled with brackish to salt water. On the right bank of the river, the higher elevation dune area contains a freshwater aquifer which limits the intrusion of salt water. The geophysical observations show that the extension of salt water intrusions is much larger than expected from existing borehole data. |
