Combination of 2D-Electrical Resistivity Imaging and Seismic Refraction Tomography methods for groundwater potential assessments: A case study of Khammouane province, Laos

Viengthong Xayavong; Minh Vu Duc; Sounthone Singsoupho; Duong Nguyen Anh; Prasad K.N.D.; Tuan Vu Minh; Chung Do Anh

doi:10.15625/2615-9783/18348

Author affiliations

Authors

Viengthong Xayavong 1-VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam; 2-Department of Physics, Faculty of Natural Science, National University of Laos, Dongdok Campus 7322, Vientiane, Laos
Vu Duc Minh VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam
Sounthone Singsoupho Department of Physics, Faculty of Natural Science, National University of Laos, Dongdok Campus 7322, Vientiane, Laos
Nguyen Anh Duong Institute of Geophysics, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
Prasad K.N.D. Gravity and Magnetics Studies Group, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500007, Telangana, India
Vu Minh Tuan Institute of Geophysics, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
Do Anh Chung Institute for Ecology and Works Protection, Vietnam Academy for Water Resources, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/18348

Keywords:

Electrical Resistivity Imaging, Seismic Refraction Tomography, groundwater, geophysical investigation, Laos

Abstract

2D Electrical Resistivity Imaging (2D-ERI) and Seismic Refraction Tomography (SRT) are non-destructive techniques widely used for numerous geophysical investigations, namely, structural geology mapping, archaeological, engineering, and groundwater investigations. The present study aims to define potential groundwater zones in the Thakhek district of Khammouane Province, Laos, by 2D-ERI and SRT methods; due to the limitation of groundwater potential information, monitoring and evaluation activities regarding groundwater quantity and quality have not been conducted in this study area. The 2D-ERI measurement is based on the Wenner configuration with an electrode spacing of 10-160 m. In contrast, SRT uses a 6.5 kg sledgehammer for a seismic source with a 4 m geophone interval. The results indicate moderate resistivity values ranging from 18.8-71 Ohm-m, and seismic velocities ranging from 1220-2140 m/s were found at 12-30 m in the study region, illustrating the existence of a groundwater/aquifer at this depth. These results correlate well with drilling results from the borehole measurements in the Thakhek district, where the water levels were found at a depth of 12 m for borehole 1 and 15 m for borehole 2. The present study also demonstrates the correlation between 2D-ERI and SRT techniques. The adopted methods favor groundwater identification in the study region and other areas with similar geology formations.

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