Analysis the Effect of Physical Parameters on Groundwater Salinity in the KEK Mandalika Lombok

Abstract

KEK Mandalika is located in a coastal area which is very vulnerable to changes in the quantity and quality of groundwater due to seawater intrusion. This study aims to detect the presence of aquifers (groundwater), seawater intrusion and analyze the effect of physical parameters to determine groundwater quality in the KEK Mandalika area. The physical parameters used are: resistivity, conductivity, Total Dissolved Solid (TDS) and salinity. The resistivity value was obtained using the geoelectric resistivity method with 10 lines using a dipole-dipole configuration, while the other parameters were obtained through 10 samples of well water which were located adjacent to the geoelectric line. Resistivity geoelectrical data processing using Res2Dinv software, Surfer13 software to observe the spread of each parameter and perform regression analysis to see the effect of resistivity, conductivity, TDS on salinity. The results obtained are geoelectric resistivity in the form of an aquifer layer around the KEK Mandalika at a depth of (2 – 12) meters with resistivity values ranging from (0 – 2257) Ωm. The results of groundwater samples are: conductivity with values ranging from (1.02 – 20) mS/cm, TDS with values ranging from (67.3 – 3070) mg/L and salinity with values ranging from (0.05 – 2.07) ppt. The effect of conductivity, TDS on salinity is directly proportional, while the effect of resistivity on salinity is inversely proportional. Most of the KEK Mandalika area is likely to experience seawater intrusion, especially in the Eastern region.

Investigation of Sediment Thickness Beneath the Mandalika Circuit and Its Surroundings Based on Microtremor Data

“…Potential hazards such as seawater intrusion, subsidence, and other earthquake-related hazards such as tsunamis and liquefaction are present in most coastal areas dominated by sedimentary rocks [5]. The potential disasters associated with seawater intrusion in the study area have been investigated using gravity and geoelectric methods [6,7,8]. Using the Microtremor method, this research investigates the potential hazards associated with earthquakes in the Mandalika Circuit and its surroundings, which are included in the Mandalika SEZ area.…”