Electrical resistivity tomography determines the spatial distribution of clay layer thickness and aquifer vulnerability, Kandal Province, Cambodia

摘要: Despite being rich in water resources, many areas of South East Asia face difficulties securing clean supply. This is particularly problematic regions with a rapidly growing population. In this study, the spatial variability thickness clay layer, controlling surface – groundwater interactions that affect aquifer vulnerability, was investigated using electrical resistivity tomography (ERT). Data were acquired along two transects, showing significant differences imaged resistivities. Borehole samples analyzed regarding particle density and composition, linked to their resistivity. The obtained relationships used translate field resistivities into lithologies. Those revealed considerable variations ranging from 0 m up 25 m. Geochemical data, highlighting zones increased ingress groundwater, confirmed discontinuities which act as preferential flow paths. results may guide urban planning Phnom Penh city expansion, order supply population safe water. presented approach geophysics estimate availability, accessibility, vulnerability not only applicable Kandal Province, Cambodia, but also other fast urbanization beyond.