Analisis Spasial Risiko Banjir Bandang Dengan Simulasi Keruntuhan Bendungan (Dam Break) Pada Bendungan Randugunting

Rachmanto, Dodhy Henri (2023) Analisis Spasial Risiko Banjir Bandang Dengan Simulasi Keruntuhan Bendungan (Dam Break) Pada Bendungan Randugunting. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bendungan Randugunting yang terletak di Kabupaten Blora, Jawa Tengah memiliki volume tampungan normal waduk 10,41 juta m3 menyimpan potensi bahaya, potensi bahaya pada bendungan tipe urugan adalah keruntuhan yang diakibatkan oleh overtopping dan piping. Berdasarkan analisa penelusuran banjir di atas pelimpah, Bendungan Randugunting tidak mengalami overtopping dengan debit banjir rencana QPMF. Oleh karena itu, simulasi keruntuhan Bendungan Randugunting dilakukan dengan asumsi keruntuhan terjadi akibat piping. Keruntuhan Bendungan Randugunting di simulasikan menggunakan perangkat lunak HEC-RAS 6.2. Permodelan simulasi keruntuhan bendungan dimodelkan dengan kondisi Muka Air Normal (MAN) dan Muka Air Banjir (MAB) dengan skenario keruntuhan piping atas, piping tengah, dan piping bawah. Data masukan pada perangkat lunak HEC-RAS berupa data teknis bendungan, debit QPMF, dan data DEMNAS. Simulasi keruntuhan bendungan menggunakan parameter keruntuhan dengan persamaan Froclich. Hasil dari simulasi keruntuhan bendungan menghasilkan peta sebaran genangan banjir, hasil sebaran genangan banjir dilakukan analisis spasial menggunakan perangkat lunak ArcGIS untuk mengetahui tingkat ancaman, risiko bencana banjir, dan kasifikasi tingkat bahaya Bendungan Randugunting. Dari hasil simulasi terdapat 38 desa yang berada di 3 kabupaten dan 20.345 jiwa penduduk terkena risiko akibat keruntuhan Bendungan Randugunting dengan jarak jangkauan banjir dari bendungan sejauh 21,31 km, sehingga dapat disimpulkan Bendungan Randugunting termasuk bendungan dengan klasifikasi bahaya tingkat 4 atau bahaya sangat tinggi.

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The Randugunting Dam, located in Blora Regency, Central Java, has a normal reservoir storage volume of 10.41 million m3, which poses potential hazards. The potential hazards for an embankment type dam like Randugunting are collapse due to overtopping and piping. Based on flood tracing analysis above the spillway, Randugunting Dam does not experience overtopping with the design flood discharge QPMF. Therefore, the simulation of Randugunting Dam failure is conducted assuming the failure occurs due to piping. The dam failure simulation of Randugunting is carried out using HEC-RAS 6.2 software. The simulation models the dam failure under normal water level and flood water level conditions with scenarios for upper, middle, and lower piping failure. The input data for HEC-RAS software consists of technical data of the dam, QPMF discharge, and DEMNAS data. The dam failure simulation uses Froclich equation as the failure parameter. The results of the dam failure simulation yield flood inundation maps. Spatial analysis of the flood inundation results is performed using ArcGIS software to assess the level of threat, flood disaster risk, and classification of the hazard level for Randugunting Dam. According to the simulation results, there are 38 villages across 3 regencies and a population of 20.345 individuals at risk due to Randugunting Dam failure, with the flood range extending up to 21,31 km from the dam. Hence, it can be concluded that Randugunting Dam falls under the classification of a level 4 hazard or a very high-risk dam.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bendungan Rangunting, HEC-RAS, Keruntuhan Bendungan, Piping
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Dodhy Henri Rachmanto
Date Deposited:	07 Aug 2023 08:38
Last Modified:	07 Aug 2023 08:38
URI:	http://repository.its.ac.id/id/eprint/102193

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