APLIKASI METODE RESISTIVITAS 2D UNTUK MENENTUKAN INTRUSI AIR LAUT DI LAMBADA LHOK, ACEH BESAR, ACEH

https://doi.org/10.22146/teknosains.34368

Gartika Setiya Nugraha(1*), Marwan Marwan(2), Akmal Muhni(3)

(1) Syiah Kuala University
(2) Universitas Syiah Kuala
(3) Universitas Syiah Kuala
(*) Corresponding Author

Abstract


Lambada Lhok adalah salah satu daerah pesisir yang mengalami krisis air bersih paling parah di Aceh Besar, Provinsi Aceh. Krisis air bersih didaerah tersebut terjadi karena adanya penerobosan air asin ke akuifer air tawar dan juga disebabkan oleh besarnya penurunan permukaan air tanah yang mengakibatkan intrusi air laut. Penelitian ini dilakukan pada empat lintasan di dua lokasi, yaitu:  3 (tiga) lintasan di Desa Lambada Lhok dan 1 (satu) lintasan di Desa Kajhu. Desa Kajhu digunakan sebagai data pembanding untuk daerah yang bebas dari intrusi air laut. Metode penelitian menggunakan metode resistivitas 2D konfigurasi Wenner-Schlumberger, sedangkan akuisisi data menggunakan instrumen ARES. Analisis data menggunakan software Res2Dinv. Hasil penelitian menunjukkan bahwa nilai resistivitas intrusi air laut di desa Lambada Lhok adalah di bawah 1,45 Ωm dengan kedalaman intrusi bervariasi dari 6 hingga 29 meter. Struktur bawah permukaan kawasan tersebut terdiri dari pasir lempungan, lempung pasiran dan lempung yang menyebar secara lateral. Hasil penelitian dapat disimpulkan bahwa penyebaran intrusi air laut di Lambada Lhok dimulai dari lintasan LL 1, LL 2 sampai dengan LL 3. Penyebaran intrusi air laut paling parah terjadi pada lintasan LL 2 dan mulai berkurang pada lintasan LL 3.


Keywords


sea-water intrusion, resistivity method, Res2Dinv, Wenner-Schlumberger,



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DOI: https://doi.org/10.22146/teknosains.34368

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