Analytical comparison of electrode configuration on 2D geoelectric method for identification of water seepage in the lake body

Abstract

The geoelectric method is a geophysical method based on the resistivity value of the material. The resistivity value gives an overview of the structure found at the observation site. The electrode configurations used are the Dipole-Dipole, Wenner-Alpha, Wenner-Schlumberger, and Pole-Dipole. The analytical measurement was carried out in the lake body with a track length of 48 meters. From the measurement results, we obtained a seepage of water in the lake body with a resistivity value <5 Ohmmeters. The observation site is dominated by clay type structure, which is found almost in all of the results of the geoelectric electrode configuration. Based on the results of the structural overview shows that the type of electrode configuration has advantages and disadvantages. The Wenner-Schlumberger configuration is very detailed with per layer structure and distribution but has the longest measurement time. Dipole-Dipole configuration has the advantage of being very sensitive to changes in vertical structure and the fastest measurement time, but not very good in horizontal structures. The Wenner-Alpha method is very sensitive to horizontal structural changes and has a moderate measurement time, but less sensitive to vertical structure changes. The pole-dipole configuration has a fast time and a moderate level of sensitivity at shallow depth. Based on the results, the Dipole-Dipole method is highly recommended because of the fast measurement time and the position of seepage can be found easier than the other methods.