Coastal aquifers are essential for coastal communities worldwide, one of which is in the Mandalika area (Lombok Island, Indonesia). This area is the tourism sector which requires an adequate supply of fresh water. Mandalika is a coastal area dominated by alluvial plains, an excellent rock as an aquifer. However, alluvial plains are also susceptible to seawater intrusion. This study uses a combination of gravity and geomagnetic methods to estimate bedrock potential as aquifers based on a 3D inversion model. Data collection was carried out at 151 measuring points using the loop method. Data processing was conducted using Oasis Montaj, Mag3D, and Grav3D. The data were combined to reduce ambiguity in interpreting rock-type estimates. The modelling results show that aquifer composition consists of sandstone, clay, and gravel with a density of about (1.3 - 2.4) g/cm3, susceptibility (0.00040 - 0.0045) SI at an average depth of 2 - 12 m with a percentage of 54.849% of the total 3D models. These rocks dominate the research location scattered around the coastal area of Kuta, around the Circuit to the Mertak area, and are concentrated in the flat morphology areas.
Fault activities was detected during periods of 2016 to 2018 which presented by land subsidence in East Lombok and Central Lombok regencies during this period. In order to find out the impact of the earthquake which occurred from July to August 2018, time lapse microgravity anomaly before and after earthquake was compared, i.e. time lapse microgravity anomaly 2016 to 2018 period and 2018 to 2019 period. Measurements were carried out at about 80 points which distributed in both of regencies. Time lapse microgravity anomalies periods of 2016 and 2018 show positive values at all measurement points and deformation analysis revealed that subsidence occurred at all study areas. The results of the time lapse microgravity anomaly data processing between the periods of 2018 to 2019 show the opposite one. The results of data analysis and processing of time lapse microgravity anomaly during period 2016 to 2019 shows the deformation process on the surface before the earthquake Lombok and it was stopped due to the events of the Lombok Earthquake in 2018. The earthquake that generated by the thrust fault mechanism causing elevation change of the research area in Central Lombok Regency and East Lombok, an event of uplifting occurred.
One of the impacts of waste management is the presence of side-residual landfill waste that causes pollution potential of pollutants results in the form of decaying garbage leachate. This contamination occurs around the landfill Kebon Kongok impacting environmental degradation around the landfill area. To determine the extent to which and how the subsurface conditions around the landfill Kebon Kongok it will do the mapping and modeling using 3dimensional (3D) geoelectrical method. The study was conducted on 3 pieces of lines are trending relative Southwest-Northeast. Each track has a length of 150m and retrieval of data using a dipole dipole configuration-with spacing of 10m length. Resistivity measurements carried out with resistivitimeter GL-4100 GSound type and processed with software Res3Dinv. From the analysis it can be concluded that the entire study area has been contaminated by leachate polution, especially in the surface layer to a depth of 13.9 meters.ABSTRAK: Salah satu dampak dari pengelolaan sampah adalah adanya sisi-sisa timbunan sampah yang potensial menyebabkan polusi dari polutan hasil pembusukan sampah berupa lindi (leachate). Pencemaran ini terjadi di sekitar TPA Kebon Kongok yang berdampak penurunan kualitas lingkungan hidup di sekitar kawasan TPA. Untuk mengetahui sejauh mana dan bagaimana kondisi bawah permukaan di sekitar TPA Kebon Kongok maka akan dilakukan pemetaan dan pemodelan dengan menggunakan metode geolistrik 3 dimensi (3D). Penelitian dilakukan pada 3 buah lintasan yang berarah relatif Barat Daya -Timur Laut. Setiap lintasan mempunyai panjang 150 m dan pengambilan datanya menggunakan konfigurasi dipol-dipol dengan panjang spasi 10 m. Pengukuran resistivitas dilakukan dengan resistivitimeter GSound GL-4100 dan diolah dengan perangkat lunak Res3Dinv. Dari analisa dapat disimpulkan bahwa seluruh area penelitian sudah terkontaminasi oleh larutan lindi terutama pada lapisan permukaan hingga kedalaman 13,9 meter.
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