Pendugaan Kedalaman Erosi Melalui Analisis Nilai Suseptibilitas Magnetik Tanah Di Salah Satu Daerah Lereng Nagari Bukik Limbuku
DOI:
https://doi.org/10.25077/jfu.12.1.56-62.2023Keywords:
erosi, suseptibilitas magnetik, daerah lereng, daerah acuanAbstract
Telah dilakukan penelitian mengenai pendugaan kedalaman erosi dan aliran air permukaan pada sebuah lereng di Nagari Bukik Limbuku melalui analisis nilai suseptibilitas magnetik tanah. Sampel tanah diambil dari dua lokasi yaitu daerah lereng dan daerah acuan yang berjarak 200 m dari daerah lereng. Pada daerah lereng sampel diambil pada lokasi seluas 3000 m2 yang terdiri dari 40 titik dengan variasi kedalaman pada masing-masing titik yaitu 10, 20, 30, 40, dan 50 cm, sedangkan pada daerah acuan sampel diambil pada satu titik dengan variasi kedalaman yaitu 10, 20, 30, 40, 50, 60, 70, 80, 90 dan 100 cm. Pengukuran suseptibilitas magnetik sampel menggunakan Magnetic Suseptibility Meter dengan frekuensi rendah. Hasil pengukuran menunjukkan bahwa nilai suseptibilitas magnetik sampel bervariasi dari 211,3×10-8 m3kg-1 sampai dengan 340,5×10-8 m3kg-1untuk daerah lereng dan dari 602,2×10-8 m3kg-1 sampai 711,4×10-8 m3kg-1 untuk daerah acuan. Hasil analisis nilai suseptibilitas magnetik sampel menunjukan bahwa keseluruhan daerah lereng telah mengalami erosi dengan kedalaman erosi lebih 50 cm dan aliran air permukaan pada daerah lereng berawal dari bagian kiri atas menuju ke selatan melewati bagian tengah lalu bergerak ke arah barat.
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