Aktivitas pertambangan dengan metode open pit mining dilakukan dengan cara pengupasan lahan, sehingga meninggalkan lahan tanpa tutupan vegetasi. Lahan tanpa tutupan vegetasi akan memperbesar laju aliran permukaan dan laju infiltrasi bawah permukaan. Metode yang digunakan untuk mengetahui tingkat pencemaran air menggunakan metode Indeks Pencemaran (IP). Hasil dari analisis terhadap sampel air yang berada di sekitar lokasi pertambangan di Kabupaten Konawe Selatan menunjukkan adanya unsur logam berbahaya seperti Arsen (As), Kromium VI (Cr+6), Kadmium (Cd), Tembaga (Cu), Seng (Zn) dan Timbal (Pb). Berdasarkan perhitungan dengan menggunakan Metode Indeks Pencemaran sampel air telah mengalami pencemaran ringan (untuk peruntukan Kelas I) dan masih memenuhi baku mutu air (untuk peruntukan Kelas III).
Landslide investigation in Laeya Village of North Buton Regency, Indonesia, is necessary since this area is frequently experiencing landslides. In this study, we applied a joint analysis of interferometric synthetic aperture radar (InSAR), electrical resistivity tomography (ERT), and in-situ geology observation. The objectives of this multidisciplinary study are: a) to estimate ground deformation through the InSAR method, b) estimation of subsurface characteristics based on the electrical resistivity of rocks, as well as estimation of the shape of the slip plane and the type of landslide that resulted; and c) to identify the surface geology conditions of the site from an in-situ geology survey. The InSAR data of the Sentinel-1A acquired from 2015 to 2017 were processed using the Sentinel toolbox. The resistivity data collected utilizing the electrodes array of the Wenner-Schlumberger configuration were processed employing the RES2DINV. The in-situ geology survey involving the observation of elevation, slope, and soil and rock type was also carried out in the landslide area. The InSAR method may estimate the deformation of slope material of the investigated sites with a magnitude ranging from -53 mm to +55 mm. The negative mark of the magnitude means that the ground deformation is ground subsidence and the positive means ground uplift. The ERT method has successfully estimated the existence of the saturated zones, the clay layer that acts as a slip plane, and the slip surface type. There are at least two types of slip planes estimated, namely the planar and uneven curvature slip planes that generate the translational and the complex landslides, respectively. In-situ observations of geological conditions support the results obtained from the InSAR and ERT methods.
Pengabdian Kepada Masyarakat Terintegrasi Kuliah Kerja Nyata (KKN) Tematik dilaksanakan di Desa Tumbu-tumbu Jaya Kecamatan Kolono Timur, Kabupaten Konawe Selatan. Wilayah Sulawesi Tenggara merupakan salah satu wilayah yang dilewati oleh jalur ring of fire memiliki tingkat kerawanan bencana alam cukup tinggi. Kegiatan Pengabdian kepada Masyarakat (PkM) terintegrasi Kuliah Kerja Nyata (KKN) ini dilakukan sebagai upaya dalam mengurangi risiko bencana gempa bumi dan tsunami di lokasi pengabdian. Permasalahan yang dihadapi dilokasi PkM adalah kurangnya kesadaran masyarakat terhadap upaya-upaya dalam mengurangi risiko bencana gempa bumi dan Tsunami. Hal tersebut dapat meningkatkan risiko bencana gempa bumi dan tsunami tersebut. Tim PkM melakukan edukasi terhadap masyarakat tentang risiko bencana Gempa bumi dan Tsunami dan upaya mengurangi risiko bancana tersebut. Pelaksanaan kegiatan PkM ini dilakukan dengan beberapa metode yaitu : survey morfologi dan penduduk desa, wawancara dengan warga, analisis risiko bencana, dan pelaksanaan FGD. Adapun hasil yang dicapai dari kegiatan ini yaitu meningkatkan kapasitas masyarakat desa Tumbu-tumbu jaya dalam menghadapi bencana gempa bumi dan tsunami.
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