Perbandingan Sebaran Sedimen dan Morfologi Menggunakan Angular Response Analysis dan Bathymetry Position Index pada Zona Semburan dan Non-Semburan Gas

Lukito, Raka Pediansyah Miharsa (2026) Perbandingan Sebaran Sedimen dan Morfologi Menggunakan Angular Response Analysis dan Bathymetry Position Index pada Zona Semburan dan Non-Semburan Gas. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Aktivitas semburan gas bawah laut merupakan proses geologi aktif yang dapat membentuk morfologi khas dan memengaruhi karakteristik sedimen dasar laut. Penelitian ini bertujuan untuk membandingkan morfologi dasar laut dan sebaran sedimen antara zona semburan dan non-semburan gas di perairan Cekungan Weh, Aceh. Data primer berupa raw data MBES Kongsberg EM304 yang diakuisisi pada Mei 2024 diolah menggunakan Bathymetric Position Index (BPI) untuk klasifikasi struktur morfologi, serta Angular Response Analysis (ARA) untuk klasifikasi sedimen berdasarkan pola respons sudut intensitas backscatter. Uji korelasi Pearson digunakan untuk mengkuantifikasi hubungan antara intensitas backscatter dengan ukuran butir sedimen. Hasil penelitian menunjukkan perbedaan morfologi yang signifikan. Fitur utaman Area semburan teridentifikasi sebagai Submarine Ridge pada kedalaman 58 m hingga 2.318 m dengan nilai slope mencapai >45° dan rugosity maksimum 0,3. Sedangkan, fitur utama area non-semburan teridentifikasi sebagai Seamount pada kedalaman 1.854 m hingga 3.528 m. Klasifikasi sedimen menggunakan ARA menghasilkan tiga kelas pada area semburan (batuan, pasir, dan lanau) dan dua kelas pada area non-semburan (batuan dan pasir), dengan Overall Accuracy 86,7% dan nilai Cohen's Kappa 0,444. Korelasi backscatter–phi Wentworth menunjukkan hubungan negatif kuat pada area semburan (R² = 0,603; r = −0,777) dan sangat kuat pada area non-semburan (R² = 0,761; r = −0,872), Hal tersebut mengonfirmasi bahwa aktivitas gas melemahkan hubungan antara akustik dengan sedimen. Integrasi BPI dan ARA terbukti efektif untuk pemetaan laut dalam, meskipun kinerja ARA menurun pada morfologi yang kompleks.
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Submarine gas is an active geological process that shapes distinctive seafloor morphology and alters sediment characteristics. This study aims to compare seafloor morphology and sediment distribution between potential and non-potential gas zones in the Weh Basin, Aceh. Raw data from a Kongsberg EM304 Multibeam Echosounder (MBES), acquired in May 2024, were processed using Bathymetric Position Index (BPI) for morphological structure classification and Angular Response Analysis (ARA) for acoustic-based sediment classification. Pearson correlation analysis was applied to quantify the relationship between backscatter intensity and sediment grain size. Results reveal significant morphological contrasts between the two zones. The Gas area was identified as a Submarine Ridge at depths of −58 m to −2,318 m, with slopes exceeding 45° and a maximum rugosity of 0.3, while the non-gas area was classified as a Seamount at depths between −1,854 m and −3,528 m. ARA sediment classification identified three classes in the gas zone (rock, sand, and silt) and two classes in the non-gas zone (rock and sand), achieving an overall accuracy of 86.7% and a Cohen's Kappa of 0.444. Backscatter–Wentworth phi correlation analysis yielded a strong negative relationship in the seepage zone (R² = 0.603; r = −0.777) and a very strong negative relationship in the non-seepage zone (R² = 0.761; r = −0.872), confirming that gas activity distorts the acoustic–sediment relationship. These findings demonstrate that integrating BPI and ARA is effective for deep-sea mapping, while underscoring the limitations of ARA under complex topographic conditions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Multibeam Echosounder, Angular Response Analysis, Bathymetric Position Index, Morfologi bawah laut, Klasifikasi sedimen dasar laut, Multibeam Echosounder, Angular Response Analysis, Bathymetric Position Index, Submarine gas seepage, Seafloor sediment classification
Subjects:	Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil Engineering and Planning > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Raka Pediansyah Miharsa Lukito
Date Deposited:	15 Jul 2026 01:38
Last Modified:	15 Jul 2026 01:38
URI:	http://repository.its.ac.id/id/eprint/134971

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