Sunaryo, Suwanto Marsudi, Seno Anggoro
The research entitled with identification of seawater intrusion at the coast of Amal, Binalatung, Tarakan by means of geoelectrical resistivity data has been conducted. The study was conducted with the objective to distinguish the presence of seawater intrusion layer or salt-water aquifer distribution along the data acquisition line with a length of 7.1km approximately. The nearest space from the data acquisition point to the beach is 0.3km while the furthest distance is 2.52km. Path of research data acquisition planned for the gas line facility. Data acquisition was conducted by using the Wenner-Schumberger configuration of geoelectrical resistivity. From this research, we obtained 8 points of vertical electrical sounding (VES) data was obtained with the distance between electrode a = 10m. The result of the calculation of the data in apparent resistivity value for further curve matching was applied between the observed curve and the model curve to get the true resistivity value of each layer respectively. Based on the data processing obtained depth up to 55m with the smallest resistivity value is 0.85Ωm and the largest is 8914.22Ωm. To make the distribution of resistivity values along the path line of the study, cross sections were made until a depth of 50m using Kriging interpolation. Based on the cross-section, the low resistivity value (less than 1.5 Ωm) that interpreted as a seawater intrusion layer or salt water aquifer distribution is located at top depth about 10m to 30m and bottom depth about 30m to 55m. © 2018 World Research Association. All rights reserved.
Geophysical Engineering, University of Brawijaya, Indonesia; Water Resources Engineering, University of Brawijaya, Indonesia
