• Title/Summary/Keyword: 소파호안 형상

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Effect of the Shape of Absorbing Revetment on Wave Overtopping Rate (소파호안의 형상이 월파량에 미치는 영향)

  • Hur, Dong-Soo;Choi, Dong-Seok;Choi, Sun-Ho
    • Journal of Ocean Engineering and Technology
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    • v.22 no.6
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    • pp.7-12
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    • 2008
  • The present study numerically investigates the effect of the shape of absorbing revetment on wave overtopping rate under regular and irregular incident waves. At first, the numerical model developed by Hur and Choi(2008), which considers the flow through a porous medium with inertial, laminar and turbulent resistance terms, directly simulates Wave-Structure-Sandy seabed interaction and can determine the eddy viscosity with LES turbulent model in 2-Dimensional wave field (LES-WASS-2D), is validated when compared to experimental data. Numerical simulations are then performed to examine the effect of the shape of absorbing revetment and incident wave conditions on wave overtopping rate. The numerical result shows that the wave overtopping rate decreases with the slope gradient of absorbing revetment under both regular and irregular waves. In addition, the effects of mean grain size and porosity of absorbing revetment, incident wave period and crest height on wave overtopping rate are discussed.

A Study of Hydraulic Characteristics in Front of the Seawall under the Coexistence of Wave and Wind (파랑과 바람 공존장에서의 호안 전면 수리특성 검토)

  • Shim, Kyu-Tae;Kim, Kyu-Han
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.32 no.6
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    • pp.575-586
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    • 2020
  • In this study, a two-dimensional hydraulic model test was conducted to examine the hydraulic phenomena that occur around the seawall when wave and wind coexist. Based on recent seawall repair and reinforcement examples, the experimental section was constructed under the condition of installing wave dissipation blocks on the safety surface of four different representative seawalls. Water level fluctuation, reflection, overtopping and wave pressure characteristics according to external force change were reviewed. It was confirmed that the top concrete shape of the seawall is the most important factor of the hydraulic characteristics that appear in front of the seawall, and the tendency is more pronounced when wind acts. Even in the case of vertical type seawall, when wind of 3 m/s~5 m/s occurs, the amount of overtopping increases to about 5%~12%. In the case of wave pressure, it was confirmed from the experimental results that the value increased from about 1.5 to 2.2 times in front of the top of concrete block. In addition, it was confirmed that when the shape of the seawall was different, the range of change in the hydraulic characteristics appeared larger. Therefore, when designing a seawall of a new shape, a more detailed review of the hydraulic characteristics should be accompanied based on these experimental results.