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All Journal Fondasi: Jurnal Teknik Sipil
Firyaal Nabila
Universitas Sultan Ageng Tirtayasa
Civil Engineering, Building, Construction & Architecture Transportation

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Effect of Discharge Variations on Flow Characteristics in Chute Syabrina Arvadelia; Firyaal Nabila; Bayu Krisna Wisnulingga; Ngakan Putu Purnaditya; Bambang Adhi Priyambodho; Subekti Subekti
Jurnal Fondasi Vol 15, No 1 (2026)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v15i1.39612

Abstract

The utilization of water resources in open channel systems is critical to support drainage efficiency and surface flow control, especially in areas with steep topographic conditions. Chute are used to overcome flows with large base slopes so that channels can be designed with sub-critical bottom slopes and do not cause erosion. This study aims to analyze the effect of discharge variations on the characteristics of flow and hydraulic jump on chute. The research method uses a physical model using flume conducted at the Integrated Laboratory of Sultan Ageng Tirtayasa University. Based on the results of the study, it was shown that the increase in flow discharge at the constant slope (1:1) and the difference in the constant height of the chute (0.2 m) resulted in an increase in water level elevation and an increase in velocity upstream, retreat and downstream. The type of flow that occurs upstream is an almost critical flow (Fr = 1), while the type of flow in the upstream and downstream is a supercritical flow (Fr > 1). The hydraulic jump length and hydraulic jump height have increased due to the increase in flow discharge. The flow velocity and froude numbers from upstream to upstream have increased, while the flow velocity and froude numbers from downstream have decreased.
Dam Break Simulation of Sindangheula Dam Using HEC-RAS 2D Angel Laurent Aldamike Dipra Sintia; Firyaal Nabila; Subekti Subekti; Bambang Adhi Priyambodho; Ngakan Putu Purnaditya; Bayu Krisna Wisnulingga
Jurnal Fondasi Vol 15, No 1 (2026)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v15i1.39450

Abstract

Dams serve various utilities but inherently carry significant risks, particularly the potential for dam failure, which can lead to catastrophic flooding due to the sudden release of high-velocity flows toward downstream areas. While dam break simulations have been widely studied, no prior research has specifically analyzed the Sindangheula Dam using the HEC-RAS model. This study aims to simulate dam failure to determine the design flood discharges for Q1000 and QPMF, the resulting hydrographs following the dam break, and the extent of flood inundation. The design flood hydrographs in this simulation were generated using the Snyder method and modeled through the HEC-HMS software. The dam break analysis for Sindangheula Dam was conducted using a fully 2D model in HEC-RAS, incorporating both overtopping and piping failure scenarios Froehlich 2008. The hydrologic analysis yielded a Q1000 discharge of 498,27 m³/s and a QPMF discharge of 701,88 m³/s. The overtopping scenario produced the most severe impacts, with peak hydrographs reaching 5168,57 m³/s for Q1000 and 5267,21 m³/s for QPMF. Flood depths reached up to 18,27 m with an inundation area of 66,62 km² under Q1000, and up to 18,22 m with 70,44 km² under QPMF, submerging downstream regions including Taktakan, Serang, Cipocok, Kasemen, and Pontang.
Co-Authors Angel Laurent Aldamike Dipra Sintia Bambang Adhi Priyambodho Bayu Krisna Wisnulingga Ngakan Putu Purnaditya Subekti Subekti Syabrina Arvadelia