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Bagus Adityawan , Mohammad
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Civil Engineering, Building, Construction & Architecture

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Study of Flood Risk Assessment on Banyumas and Cilacap District in Downstream Serayu River Basin, Indonesia Kirana, Pratita Hana; Farid, Mohammad; Bagus Adityawan , Mohammad; Kuntoro, Arno Adi; Widyaningtyas, Widyaningtyas
Jurnal Teknik Sipil Vol 30 No 2 (2023): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2023.30.2.2

Abstract

Abstract. Floods due to the Downstream Serayu River overflow inundate agricultural land and houses in parts of Banyumasand Cilacap district every year. Based on the classification of flood hazard level referring to Chief of BNPBRegulation Number 2 the Year 2012 on General Guidelines for Assessment of Disaster Risk, some location pointsexperienced a high level of flood hazard (>1.5 m). The objective of this study is to develop a flood risk map by usingGIS. Flood hazard assessment uses the HEC-RAS 5.0.6 two-dimensional model, verified with field observation data.The river discharge is obtained from hydrological calculations, while the tidal component is obtained usingMATLAB-LP Tides BIG. River geometry uses river cross-section from field measurement data for hydraulicmodeling combined with MERIT DEM as its banks. The capacity level also refers to the BNPB Number 2 the Year2012. In this study, BNPB and PUPR parameters are used. The vulnerability component refers to a 2014 study fromthe Ministry of Public Work and Housing (PUPR) Indonesia. The 50-year flood return period shows that the totalarea of risk flooded areas in the Downstream Serayu River Basin is 6.22 km2, while high-risk flooded areas are 2.2 km2. Keywords: Flood risk, HEC-RAS 2D, GIS, MATLAB–LP Tides BIG, MERIT DEM Abstrak. Banjir akibat luapan Sungai Serayu Hilir setiap tahun menggenangi lahan pertanian dan perumahan di sebagianwilayah Kabupaten Banyumas dan Cilacap. Berdasarkan klasifikasi tingkat bahaya banjir mengacu padaPeraturan Kepala BNPB Nomor 2 Tahun 2012 tentang Pedoman Umum Pengkajian Risiko Bencana, beberapa titiklokasi mengalami tingkat bahaya banjir tinggi (>1,5 m). Tujuan dari penelitian ini yaitu mengembangkan petarisiko banjir dengan menggunakan SIG. Pemodelan banjir menggunakan model dua dimensi HECRAS 5.0.6, yangdiverifikasi dengan data observasi lapangan. Debit sungai diperoleh dari perhitungan hidrologi, sedangkankomponen pasang surut diperoleh dari perhitungan menggunakan MATLAB-LP Tides BIG. Geometri sungaimenggunakan penampang sungai dari data pengukuran lapangan untuk pemodelan hidrolik yang dikombinasikandengan MERIT DEM sebagai bantarannya. Tingkat kapasitas juga mengacu pada Peraturan Kepala BNPB Nomor2 Tahun 2012. Dalam penelitian ini digunakan parameter BNPB dan PUPR. Komponen kerentanan mengacu padastudi tahun 2014 dari Kementerian Pekerjaan Umum dan Perumahan Rakyat (PUPR) Indonesia. Periode ulangbanjir 50 tahun menunjukkan bahwa total luas area yang berisiko banjir di DAS Serayu Hilir sebesar 6,22 km2,sedangkan area dengan tingkat risiko banjir tinggi sebesar 2,2 km2. Kata-kata Kunci: Risiko banjir, HEC-RAS 2D, SIG, MATLAB–LP Tides BIG, MERIT DEM
Study of Sedimentation Control on Bangga River, Palu Watershed, Central Sulawesi Savitri, Fanny Aliza; Bagus Adityawan , Mohammad; Widyaningtias, Widyaningtias
Jurnal Teknik Sipil Vol 30 No 2 (2023): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2023.30.2.3

Abstract

Abstract. Bangga River is located in a mountainous area in the Palu River Basin with an area of 74.82 km2 and a river lengthof 16.97 km. Flood with the approximated water depth of 3 m occur in Bangga’s Village. The cliffs upstream of theBangga River areunstable and can easily collapse due to the disaster. Ministry of Public Works and Housingcontrol through Sabo dam’s structure. This study aims to analyze the performance of sabo dam’s structure inreducing sediments and the floods. Analysis and modeling using two scenarios, before and after the sabo damstructure’s control was built, using HEC-RAS Software with purposeful 1D modeling to simulate flow patterns, totalsediment. The HEC-RAS simulation shows that the water surface is stood at 2.1 m depth in the existing condition.Sabo dam structure can reduce of sediment transport, which was computed according to Engelund (81%reduction), Mayer Peter Muller (MPM) with 92% reduction, and Yang (91% sediment yields reduction). So, thesabo dam's structure is not merely utilized to retain the sediment, but it can reduce potential flooding in the future.Keywords: Sedimentation, sediment control building, HEC-RAS, sabo dam, flood. Abstrak. Sungai Bangga terletak di daerah pegunungan di DAS Palu dengan luas 74,82 km2 dan memiliki panjang sungai16,97 km. Banjir dengan kedalaman air + 3 m terjadi di Desa Bangga. Tebing-tebing di hulu Sungai Bangga tidakstabil dan mudah runtuh akibat bencana. Kementerian Pekerjaan Umum dan Perumahan Rakyat mengontrolmelalui bangunan Sabo dam. Penelitian ini bertujuan untuk menganalisis kinerja bangunan Sabo dam dalammereduksi sedimen dan banjir. Analisis dan pemodelan dilakukan dengan dua skenario yaitu sebelum dan sesudahbangunan sabo dam terbangun, menggunakan Software HEC-RAS dengan pemodelan 1D yang bertujuan untukmensimulasikan pola aliran dan total sedimen. Simulasi HEC-RAS menunjukkan bahwa kedalaman air beradapada 2,1 m pada kondisi eksisting. Bangunan sabo dam dapat mereduksi transpor sedimen, yang dihitung menurutbeberap rumus yaitu Engelund (reduksi 81%), Mayer Peter Muller (MPM) dengan reduksi 92%, dan Yang (reduksi91%). Jadi, bangunan sabo dam tidak hanya dimanfaatkan untuk menahan sedimen, tetapi dapat mengurangipotensi banjir di masa depan. Kata-kata kunci: Sedimentasi, bangunan pengontrol sedimen, HEC-RAS, sabo dam, banjir.
Co-Authors Arno Adi Kuntoro, Arno Adi Kirana, Pratita Hana Mohammad Farid Savitri, Fanny Aliza Widyaningtias Widyaningtias, Widyaningtias Widyaningtyas, Widyaningtyas