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All Journal Civil and Environmental Science Journal (CIVENSE) Jurnal Teknologi dan Rekayasa Sumber Daya Air
Winarta, Bambang
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science

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Analysis of Waikelo Port Breakwater Failure through 2D Wave Model Winarta, Bambang; Damarnegara, A. A. N Satria; Anwar, Nadjadji; Juwono, Pitojo Tri
Civil and Environmental Science Journal (CIVENSE) Vol 1, No 2 (2018)
Publisher : Fakultas Teknik UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2018.00102.6

Abstract

Waikelo Port is located in South West Sumba of East Nusa Tenggara. The port facilities are protected by breakwater with a vertical wall construction and it was built in a relatively deep ocean at -15m of Low Water Sea Level (LWS). On 21 of January 2012, an earthquake with magnitude of 6.3 Richter scale occurred around Sumba Island and it caused cracking in the concrete wall of breakwater. Then, 4 days after on 25 st January 2012, a heavy wind of 20–23 knots generated a high wave around 4.0–5.0m in Sumba strait. These high waves caused a critical damage on the west part of the breakwater. The damage of port facilities were getting worse when a storm called Lua hit on March 2012. This study was conducted to observe the effect of the extreme event in the failure of breakwater. The result of two-dimensional (2D) wave model shows that the wave heights in the area of breakwater are varied 3.80 to 4.0m. It is quite greater than the wave design of 50 years return period (= 2.00m) which was used in breakwater design and calculation. This observable fact confirms that the failure of breakwater was caused by the continuous extreme events that exceed the design criteria
Pemodelan Aliran Sungai Jatiroto Menggunakan Software HEC-RAS 5.0.7 Arimbi, Rovita Yuniarti; Sumiadi, Sumiadi; Winarta, Bambang
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 2 No. 2 (2022): Jurnal Teknologi dan Rekayasa Sumber Daya Air (JTRESDA)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2022.002.02.23

Abstract

The Jatiroto River area, which is located on the border of Lumajang Regency and Jember Regency, is often hit by floods when the rainy season arrives. In 2022, floods hit the lower reaches of the Jatiroto River with an average water level of 30-50 cm. The influence of backwater from the Bondoyudo River downstream and discharge shipments from tributaries makes the cross-sectional capacity of the Jatiroto River unable to accommodate the incoming water discharge. The purpose of this flow modeling is to determine the point of the river section that occurs runoff so that it can be used as a recommendation for flood disaster prevention and mitigation plans.  Calibration of flow modeling to determine n Manning using observational discharge in the weir and historical data of flooding on December 23, 2018. The results of the flow simulation using HEC-RAS 5.0.7 obtained n Manning values of 0.025 and 0.023. The planned flood discharge used for modeling analysis of existing conditions is Q2th of 373.10 m3/sec. From the results of the simulation of the flow of existing conditions in Q2th that in some river sections there was an overflow of water, especially the downstream section.Wilayah Sungai Jatiroto yang terletak di perbatasan Kabupaten Lumajang dan Kabupaten Jember sering diterjang banjir ketika musim penghujan tiba. Tahun 2022 kejadian banjir menerjang wilayah bagian hilir Sungai Jatiroto dengan ketinggian air rata-rata 30-50 cm. Adanya pengaruh backwater dari Sungai Bondoyudo di bagian hilir dan kiriman debit dari anak sungai membuat kapasitas penampang Sungai Jatiroto tidak dapat menampung debit air yang masuk. Tujuan dari pemodelan aliran ini untuk mengetahui titik ruas sungai yang terjadi limpasan sehingga dapat dijadikan rekomendasi rencana pencegahan dan mitigasi bencana banjir. Kalibrasi pemodelan aliran untuk menentukan n Manning menggunakan debit pengamatan di bendung dan data historis banjir pada tanggal 23 Desember 2018. Hasil dari simulasi aliran menggunakan HEC-RAS 5.0.7 didapatkan nilai n Manning sebesar 0,025 dan 0,023. Debit banjir rencana yang digunakan untuk analisis pemodelan kondisi eksisting yaitu Q2th sebesar  373,10 m3/det. Dari hasil simulasi aliran kondisi eksisting Q2th bahwasanya di beberapa ruas sungai terjadi luapan air terutama ruas bagian hilir.
Co-Authors Arimbi, Rovita Yuniarti Damarnegara, A. A. N Satria Nadjadji Anwar Pitojo Tri Juwono Sumiadi, Sumiadi