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Experimental and Theoretical Study on Flood Bore Propagation and Forerunner Generation in Dam-Break Flow

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Abstract

Dam-break flows are not only an important practical problem in civil and hydraulic engineering, but also a fundamental problem of fluid mechanics. Due to property damage and the loss of numerous lives, it is critically important to have an exhaustive understanding of the landslide dam-break flow and sedimentation. The main objective of this study is a detailed analysis of the mechanisms of dam-breaking flows through physical and theoretical modeling. Our experimental work was focused on the initial stages of dam-break flow in the water channel, where a thin plate separating water at different levels is impulsively withdrawn in the vertical direction upwards, and as a result, a hydrodynamic bore is formed. The theoretical model of the dam-break flow is based on Benney’s shallow water equations. We separately studied the regimes of a breaking and non-breaking bore front. On the hydrodynamic bore, the laws of conservation of mass, momentum, and energy were required in contrast to the classical solutions of Ritter and Stoker, in which the conservation of energy law was not considered at all. The non-breaking flow includes several zones: a shock wave and a shear vorticity flow after it, a contact surface and a continuous discharge zone. The bore in our solution moves faster than the classical bore, which, in turn, propagates faster than the contact surface. The breaking bore is characterized by the generation of a “mushroom-jet” structure, including a pair of vortices, oppositely directed, and a forerunner formed by the plunging jet directed forward. We found that the forerunner of the breaking bore has a speed significantly higher than the speed of the bore. The experiments carried out in the wave flume of the Tainan Hydraulics Laboratory confirmed the theoretical predictions of the proposed dam breaking flow model for various initial conditions.

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Funding

The reported study was funded by RFBR and TUBITAK according to the research project no. 20-55-46005. The authors acknowledge the financial support from the Ministry of Science and Technology of Taiwan under Grant Number MOST 106-2221-E-110-036-MY3 for this study. This research was also performed in the framework of the state assignment of FASO Russia (Theme no. 0149-2018-0015).

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Authors and Affiliations

  1. Department of Marine Environment and Engineering, National Sun Yat-Sen University, 804, Kaoshiung, Taiwan

    I. V. Shugan & Yang-Yih Chen

  2. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997, Moscow, Russia

    I. V. Shugan

  3. Department of Civil Engineering, National Cheng Kung University, 70101, Tainan, Taiwan

    Cheng-Jung Hsu

Authors
  1. I. V. Shugan
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  2. Yang-Yih Chen
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  3. Cheng-Jung Hsu
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Correspondence to I. V. Shugan.

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The text was submitted by the authors in English.

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Shugan, I.V., Chen, YY. & Hsu, CJ. Experimental and Theoretical Study on Flood Bore Propagation and Forerunner Generation in Dam-Break Flow. Phys. Wave Phen. 28, 274–284 (2020). https://doi.org/10.3103/S1541308X20030188

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