The integration of remote sensing and geoelectrical resistivity for identifying the distribution of groundwater potential in Palu City

Abstract

Groundwater distribution is one of the factors that can support the development of a region, including Palu City, which is the Capital of the Central Sulawesi Province. This research was conducted to find out the distribution of the groundwater potential in Palu City. The parameters used in remote sensing data were based on geomorphological factors, fertility, and vegetation density. Geomorphology used DEM data from SRTM imagery, while vegetation fertility used unsupervised classification method, and vegetation density used the NDVI method. The weight test of the three factors was conducted using the AHP method. The parameters of the geoelectrical resistivity used Wenner and Schlumberger configurations. In remote sensing, the weighting results obtained the vegetation fertility of 39, vegetation density of 33, and geomorphology of 16. The Geoelectrical resistivity obtained the resistivity value of rocks of 10 - 69.66 Ωm as a layer of groundwater potential distribution. The high distribution of groundwater potential is generally in the Palu valley, while the moderate distribution is in the eastern hills and a small part in the western hills and the low distribution is in the western hills and eastern part of Palu City.