Electronic Theses and Dissertation

Desa Mon Ikeun, Kecamatan Lhoknga, Kabupaten Aceh Besar mengalami krisis air akibat musim kemarau berkepanjangan. Penelitian ini bertujuan untuk mengidentifikasi potensi air tanah menggunakan metode Vertical Electrical Sounding (VES) dan Audio-Magnetotelluric (ADMT). Metode VES menghasilkan data resistivitas satu dimensi secara vertikal, sedangkan metode ADMT memberikan informasi resistivitas dua dimensi terhadap kedalaman. Akuisisi data metode VES dilakukan pada tiga titik sounding dengan bentangan elektroda sepanjang 200 meter dan ADMT sebanyak enam lintasan dengan panjang masing-masing 14-15 meter. Korelasi antara hasil VES dan citra resistivitas ADMT pada lokasi yang berdekatan menunjukkan kesesuaian pola distribusi resistivitas pada sebagian besar titik pengukuran, khususnya pada area yang terindikasi sebagai zona akuifer, meskipun pada beberapa titik terdapat perbedaan yang diduga dipengaruhi oleh faktor musiman serta keterbatasan kontinuitas lateral akuifer. Berdasarkan hasil interpretasi, teridentifikasi dua zona potensi akuifer. Zona utama berada pada kedalaman sekitar 38–66 meter (29,2–48,1 Ohm meter) menurut hasil VES-01, yang sesuai dengan zona resistivitas rendah (di bawah 0,3 Ohm meter) pada hasil ADMT-01 dan ADMT-02 pada kedalaman 10–70 meter. Zona kedua berupa lapisan kerikil dangkal pada kedalaman 1–3,6 meter (45,3–218 Ohm meter) di VES-02, serta zona jenuh air pada kedalaman 40–100 meter di ADMT-03. Kedua zona ini memiliki porositas dan permeabilitas yang mendukung penyimpanan serta pergerakan air tanah, sehingga berpotensi dimanfaatkan sebagai sumber air bersih bagi masyarakat setempat.

Kata kunci : Desa Mon Ikeun, krisis air, air tanah, resistivitas, VES, ADMT

The village of Mon Ikeun, Lhoknga District, Aceh Besar Regency, is experiencing a water crisis due to prolonged drought. This study aims to identify groundwater potential using the Vertical Electrical Sounding (VES) and Audio-Magnetotelluric (ADMT) methods. The VES method produces one-dimensional vertical resistivity data, while the ADMT method provides two-dimensional resistivity information with respect to depth. VES data acquisition was conducted at three sounding points with an electrode span of 200 meters, and ADMT data acquisition was conducted along six transects, each measuring 14–15 meters in length. The correlation between VES results and ADMT resistivity images at nearby locations shows consistency in resistivity distribution patterns at most measurement points, particularly in areas indicated as aquifer zones, although some points exhibit differences likely influenced by seasonal factors and limitations in lateral aquifer continuity. Based on the interpretation results, two potential aquifer zones were identified. The main zone is located at a depth of approximately 38–66 meters (29.2–48.1 Ohm meter) according to the VES-01 results, which corresponds to the low resistivity zone (under 0.3 Ohm meter) in the ADMT-01 and ADMT-02 results at a depth of 10–70 meters. The second zone consists of a shallow gravel layer at a depth of 1–3.6 meters (45.3–218 Ohm meter) in VES-02, as well as a water-saturated zone at a depth of 40–100 meters in ADMT-03. Both zones have porosity and permeability that support groundwater storage and movement, making them potentially viable as a source of clean water for the local community. Keywords : Mon Ikeun Village, water crisis, groundwater, resistivity, VES, ADMT