Ocean Systems Engineering

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Finding the optimum shape of the energy dissipator to minimize the impact force due to the dam break flow

  • Asrini Chrysanti (Graduate School of Water Resources Management, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung) ;
  • Sangyoung Son (School of Civil, Environmental, and Architectural Engineering, Korea University)
  • Received : 2024.03.08
  • Accepted : 2024.05.30
  • Published : 2024.06.25
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Abstract

The sudden release of water from a dam failure can trigger bores on a flat surface and exert substantial impact forces on structures. This flow poses a high-risk flood hazard to downstream urban areas, making it imperative to study its impact on structures and devise effective energy dissipators to mitigate its force. In this study, a combination of Genetic Algorithm optimization and numerical modeling is employed to identify the optimal energy dissipator. The analysis reveals that a round arc-shaped structure proves most effective, followed by a triangular shape. These shapes offer wide adaptability in terms of structure dimensions. Structures with higher elevation, especially those with round or triangular shapes, demonstrate superior energy dissipation capabilities. Conversely, square-shaped structures necessitate minimal height to minimize impact forces. The optimal width for dissipating energy is found to be 0.9 meters, allowing for effective wave run-up and propagation. Furthermore, the force exerted on structures increases with higher initial water levels, but diminishes with distance from the dam, highlighting the importance of placement in mitigating impact forces.

Keywords

Acknowledgement

The research described in this paper was financially supported by the research project (RS-2024-00356663) of Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education.

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