ANALISIS SEBARAN AIR LINDI MENGGUNAKAN GEOLISTRIK RESISTIVITAS WENNER-SCHLUMBERGER di TPA TALUMELITO
Abstract
TPA Regional Talumelito merupakan fasilitas pengelolaan sampah yang menerima timbunan sampah dalam jumlah besar dan berpotensi menghasilkan air lindi yang dapat meresap ke bawah permukaan. Identifikasi zona rembesan air lindi diperlukan untuk mengetahui pola penyebaran dan arah migrasinya di sekitar TPA. Penelitian ini bertujuan menganalisis distribusi nilai resistivitas bawah permukaan untuk mengidentifikasi keberadaan, sebaran, dan arah rembesan air lindi di sekitar TPA Talumelito, Gorontalo. Penelitian menggunakan metode geolistrik resistivitas konfigurasi Wenner–Schlumberger pada dua lintasan pengukuran, yaitu Lintasan 1 dan Lintasan 2, dengan panjang masing-masing 100 m dan jarak antar-elektroda 5 m. Data hasil pengukuran diolah menggunakan Microsoft Excel dan perangkat lunak Res2DInv untuk menghasilkan penampang resistivitas dua dimensi. Hasil penelitian menunjukkan adanya variasi nilai resistivitas bawah permukaan pada kedua lintasan. Pada Lintasan 1 ditemukan zona resistivitas rendah sebesar 24,5–94,1 Ωm yang diduga berkaitan dengan rembesan air lindi, terutama pada bagian dekat area kolam lindi, dengan nilai RMS Error sebesar 25,2%. Pada Lintasan 2 ditemukan anomali resistivitas rendah pada beberapa bagian lintasan yang berada di antara Cell 3 dan Cell 4, dengan nilai RMS Error sebesar 15,8%. Hasil tersebut menunjukkan adanya indikasi rembesan air lindi yang dipengaruhi oleh kondisi bawah permukaan dan jalur aliran air.
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