Analisis Persebaran Air Lindi Menggunakan Metode Magnetik di TPA Sampah Ngipik Kabupaten Gresik

Widyaputri, Adinda Mutiara (2025) Analisis Persebaran Air Lindi Menggunakan Metode Magnetik di TPA Sampah Ngipik Kabupaten Gresik. Other thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Metode magnetik digunakan dalam penelitian ini untuk mengidentifikasi sebaran lindi di TPA Ngipik Kabupaten Gresik. Metode ini dipilih karena mampu mendeteksi perbedaan suseptibilitas secara cepat, efisien, dan ekonomis. Lindi memiliki nilai suseptibilitas tinggi, sementara lingkungan sekitar TPA relatif rendah, sehingga menghasilkan anomali medan magnet yang dapat terdeteksi. Meski TPA Ngipik dirancang dengan sistem sanitary landfill, namun dalam praktek lapangannya masih menggunakan sistem open dumping yang berisiko tinggi menghasilkan air lindi berbahaya. Data hasil pengukuran selanjutnya dikoreksi untuk menghasilkan Total Magnetic Intensity (TMI). Data TMI selanjutnya dianalisa menggunakan kontinuasi ke atas untuk memisahkan anomali lokal dan regional. Karena lindi berada di dekat permukaan, maka dilakukan Analisa lebih lanjut pada anomali lokal menggunakan metode Reduction to Pole (RTP), gradien vertikal, horisontal, serta analytic signal (AS) untuk mengidentifikasi posisi sebaran anomali yang diduga lindi. Analisa ini menunjukkan bahwa persebaran lindi diduga berada dibagian selatan menuju ke utara lokasi pengukuran yang ditunjukkan dengan nilai medan magnet tinggi. Selanjutnya, anomali lokal diinversi menggunakan metode Flower Pollination Algortihm (FPA) untuk mengidentifikasi kedalaman sebaran lindi. Hasil yang didapat adalah anomali yang terduga sebagai lindi berada pada kedalaman 5 – 7 m.
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The magnetic method was used in this study to identify the distribution of leachate at the Ngipik Landfill, Gresik Regency. This method was selected for its ability to detect susceptibility contrasts quickly, efficiently, and economically. Leachate has a high magnetic susceptibility, while the surrounding landfill environment generally has a lower susceptibility, resulting in detectable magnetic anomalies. Although the Ngipik Landfill was originally designed as a sanitary landfill, in practice it still operates under an open dumping system, which poses a high risk of generating hazardous leachate. The measured data were then corrected to produce Total Magnetic Intensity (TMI) values. The TMI data were analyzed using upward continuation to separate local and regional anomalies. Since leachate is typically located near the surface, further analysis focused on local anomalies using the Reduction to the Pole (RTP) method, vertical and horizontal gradients, and the analytic signal (AS) to identify the position of anomalies suspected to represent leachate. This analysis indicated that the distribution of leachate is likely concentrated from the southern to the northern parts of the study area, as shown by zones with high magnetic intensity. Subsequently, the local anomalies were inverted using the Flower Pollination Algorithm (FPA) to estimate the depth of the leachate distribution. The inversion results showed that the anomalies suspected to be caused by leachate are located at depths ranging from 5 to 7 meters

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Air Lindi, Anomali Magnetik, Interpretasi, Metode Magnetik, TPA Ngipik. Leachate, Magnetic Anomaly, Interpretation, Magnetic Method, Ngipik Landfill
Subjects:	Q Science > QE Geology Q Science > QE Geology > QE1.F557 Magnetic anomalies--Measurement.
Divisions:	Faculty of Natural Science > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Adinda Mutiara Widyaputri
Date Deposited:	24 Jul 2025 04:32
Last Modified:	24 Jul 2025 04:32
URI:	http://repository.its.ac.id/id/eprint/121006

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