Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography

With the growing population and adverse effects of climate change, pressure on coastal aquifers is increasing, leading to a larger risk saltwater intrusion (SI). SI often complex difficult characterize from well data only. In this context, electrical resistivity tomography (ERT) can provide high-resolution qualitative information lateral vertical distribution salinity. However, quantitative interpretation ERT remains because uncertainty petrophysical relationships, limitations inversion, heterogeneity aquifers. contribution, we propose methodology for semiquantitative when colocated are not available. We first use existing wells identify freshwater zones response clayey deposits. Then, approximate formation factor water samples collected in vicinity derive threshold interpret saline boundary. applied shallow Luy River Binh Thuan province, Vietnam, where resources under due agricultural, aquacultural, industrial production. Twenty-one profiles were revealed much zone, compared previous study. Saltwater present lowland areas left bank over almost whole thickness aquifer, while right constituted sand dunes that filled with freshwater. At distance sea, between fresh observed. Our could be other heterogeneous absence dense monitoring network.