Saniah, Thina El Labibah Minahus (2019) Analisis Kerentanan Topografi Dasar Laut Terhadap Potensi Longsor Bawah Laut (Underwater Landslide) di Teluk Palu, Sulawesi Tengah. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kota Palu adalah salah satu wilayah di Indonesia yang rentan terhadap bencana tsunami dan perlu memiliki suatu rencana mitigasi untuk mengurangi potensi resiko. Terjadinya tsunami pada tanggal 28 September 2018 merupakan salah satu bencana yang disebabkan oleh adanya longsor bawah laut. Salah satu penyebab terjadinya longsoran bawah laut adalah runtuhnya sedimen yang belum terkonsolidasi dan ketidakstabilan kemiringan di bawah laut. Studi penelitian ini ditujukan untuk mengetahui seberapa besar potensi longsor bawah laut ya di Teluk Palu yang ditinjau dari sedimen penyusun dasar laut dan kelerengannya. Metode yang digunakan dalam penelitian yaitu dengan menganalisa persebaran jenis sedimen dari pengolahan backscatter dan perolehan nilai kelerengan menggunakan data multibeam echosounder EM302. Hasil penelitian menunjukkan bahwa di Teluk Palu terdapat beberapa jenis sedimen dasar perairan yaitu cobble, gravel, sand, slit, dan clay. Jenis sedimen yang mendominasi adalah sand sebesar 10627,137 Ha dengan rentang nilai backscatter dari -31,67 dB sampai -22,36 dB. Sedangkan kelerengan yang paling besar terdapat pada kelas terjal (40% - 100%) dengan luasan sebesar 11750,030 Ha. Hasil analisis dari potensi longsor bawah laut di Teluk Palu menunjukkan bahwa di area penelitian memiliki kerentanan yang sangat tinggi yaitu sebesar 66,68%
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Palu, Central Sulawesi is one of the areas in Indonesia that is vulnerable to the tsunami disaster and needs to have a mitigation plan to reduce potential risks. The earthquake and tsunami that occurred on September 28, 2018 was one of the disasters which caused many material and non-material losses. Underwater slope instability associated with underwater avalanches can be caused by the collapse of sediments that have not been consolidated due to tectonic processes, such as earthquakes or oversteepening. This research is intended to find out how much potential underwater landslides in Palu Bay are viewed from the constituent sediments of the seabed and its slope. The method used in the research is by analyzing the distribution of sediment types from backscatter processing and obtaining slope values using multibeam echosounder EM302 data. The results showed that in Palu Bay there were several types of sediment distribution on seabed, namely cobble, gravel, sand, slit, and clay. The type of sediment that dominates is sand at 10627.137 ha and the range of backscatter values from -62.59 dB to -22.36 dB. While the largest slope is found in steep classes (40% - 100%) with an area of 11750.030 ha. From the parameters of the type of sediment and slope obtained the distribution of potential underwater landslides and classified into four groups, namely low, moderate, high, and very high. Analysis of the potential of underwater landslides in Palu Bay shows that the largest percentage of 66.68% of the total research area is very high.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSG 526.98 San a-1 2019 |
| Uncontrolled Keywords: | Backscatter, Kelerengan, Longsor bawah laut, Sedimen |
| Subjects: | G Geography. Anthropology. Recreation > GC Oceanography T Technology > TA Engineering (General). Civil engineering (General) > TA590 Topographical surveying |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geomatics Engineering > 29202-(S1) Undergraduate Theses |
| Depositing User: | Thina El Labibah Minahus Saniah |
| Date Deposited: | 10 Jan 2024 08:01 |
| Last Modified: | 10 Jan 2024 08:01 |
| URI: | http://repository.its.ac.id/id/eprint/65140 |
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