Dambreak dan Analisis Peta Risiko Banjir Akibat Keruntuhan Bendungan Sidan Menggunakan HEC-RAS 2D dan InaSAFE

Muhammad Khan Al Ayyubi, Ghulam (2025) Dambreak dan Analisis Peta Risiko Banjir Akibat Keruntuhan Bendungan Sidan Menggunakan HEC-RAS 2D dan InaSAFE. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bendungan Sidan terletak pada Daerah Aliran Sungai Tukad Ayung, yang terletak di Provinsi Bali. Bendungan Sidan merupakan tipe bendungan zonal dengan inti aspal yang direncanakan memiliki luas genangan 81,81 Ha. Penyebab keruntuhan bendungan yang paling sering terjadi dikarenakan piping dan overtopping. Dalam analisisnya Bendungan Sidan mengalami overtopping, karena ketinggian muka air sebesar +826,29 dengan debit banjir rancangan PMF (Probable Maximum Flood) sebesar 1076,47 m3/detik dan mempertimbangkan pengaruh gelombang angin. Selanjutnya, analisis keruntuhan Bendungan Sidan menggunakan software HEC-RAS 6.5 dengan menggunakan skenario banjir PMF yang menghasilkan luas genangan sebesar 39,48 km2. Berdasarkan hasil analisis, didapatkan beberapa wilayah hilir yang terdampak yaitu, dua kabupaten dan 1 kota, yaitu Kabupaten Badung yang terdiri dari 22 desa di 3 kecamatan, Kabupaten Gianyar yang terdiri dari 9 desa di 3 kecamatan, dan Kota Denpasar yang terdiri dari 16 desa di 4 kecamatan. Selanjutnya jumlah penduduk yang terpapar akibat keruntuhan Bendungan Sidan dengan menggunakan InaSAFE yaitu sebesar 60100 ribu. Keruntuhan Bendungan Sidan termasuk dalam kategori risiko tinggi karena tingkat ancaman yang tinggi dan juga tingkat kerentanan sosisal yang tinggi.Selanjutnya, sebagai sarana tanggap darurat akibat bencana keruntuhan Bendungan Sidan, maka diperlukan lokasi dan jalur pengungsian yang dibagi menjadi dua zona, yaitu zona barat dan timur. Dalam hal ini, penentuan lokasi dan jalur pengungsian sesuai dengan Peraturan Kepala BNPB No.7 Tahun 2008 dengan bantuan software QGIS.
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Sidan Dam is located in the Tukad Ayung River Basin, located in Bali Province. Sidan Dam is a zonal dam type with an asphalt core that is planned to have a flood area of 81.81 Ha. The most common causes of dam collapse are piping and overtopping. In the analysis, Sidan Dam experienced overtopping, because the water level was +826,29 with a design flood discharge of PMF (Probable Maximum Flood) of 1076.47 m3/second and considering the influence of wind waves. Furthermore, the analysis of the collapse of Sidan Dam used HECRAS 6.5 software using the PMF flood scenario which resulted in a flood area of 39.48 km2. Based on the results of the analysis, several downstream areas were affected, namely, two regencies and 1 city, namely Badung Regency which consists of 22 villages in 3 sub-districts, Gianyar Regency which consists of 9 villages in 3 sub-districts, and Denpasar City which consists of 16 villages in 4 sub-districts. Furthermore, the number of people exposed to the collapse of the Sidan Dam using InaSAFE is 60.100 thousand. The collapse of the Sidan Dam is included in the high-risk category due to the high level of threat and also the high level of social vulnerability. urthermore, as a means of emergency response due to the collapse of the Sidan Dam, evacuation locations and routes are needed which are divided into two zones, namely the west and east zones. In this case, the determination of the location and evacuation route is in accordance with the Regulation of the Head of BNPB No. 7 of 2008 with the help ofQGIS software.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Banjir, HEC-RAS 2D, Keruntuhan Bendungan, QGIS, InaSAFE ============================================================ Flood, HEC-RAS 2D, Dam Break, QGIS, InaSAFE
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Ghulam Muhammad Khan Al Ayyubi
Date Deposited:	07 Feb 2025 06:42
Last Modified:	07 Feb 2025 06:42
URI:	http://repository.its.ac.id/id/eprint/118548

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