Effects of Roughness and Vertical Wall Factors on Wave Overtopping in Rubble Mound Breakwaters in Busan Yacht Harbor
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초록
Coastlines are protected by breakwater structures against the erosion of sand or other materials along beaches due to wave action. This research examined the use of physical modeling to determine the effects of the tetrapod size and vertical walls of a rubble mound on thevolume of wave overtopping under irregular wave conditions in coastal areas in Busan Yacht Harbor. In this analysis model, the structures werestudied using irregular waves and the JONSWAP wave energy spectrum. To understand the effects of the tetrapod size and heights of the verticalwall, the study considered vertical walls of 0, 1.78, 6.83, and 9.33 cm with armor double layered material tetrapods of 8, 12, 16, and 20 tons. Anextensive number of experiments covering a relatively large range of variables enabled a comprehensive discussion. First, in the presence of a shortvertical wall, the water level played a key role in the overtopping discharge. In such circumstances, the values of the wave overtopping dischargedecreased with increasing freeboard size. In the presence of a tall freeboard and middle, the value of the wave overtopping discharge was equallyinfluenced by the vertical wall factor. Moreover, the tetrapod size decreased by an increase in the vertical wall factor, and relationship between themresulted in a short wall height. From an engineering point of view, considering a small water level may allow the choice of a shorter vertical wall,which would ultimately provide a more economical design.
Abstract
Coastlines are protected by breakwater structures against the erosion of sand or other materials along beaches due to wave action. This research examined the use of physical modeling to determine the effects of the tetrapod size and vertical walls of a rubble mound on thevolume of wave overtopping under irregular wave conditions in coastal areas in Busan Yacht Harbor. In this analysis model, the structures werestudied using irregular waves and the JONSWAP wave energy spectrum. To understand the effects of the tetrapod size and heights of the verticalwall, the study considered vertical walls of 0, 1.78, 6.83, and 9.33 cm with armor double layered material tetrapods of 8, 12, 16, and 20 tons. Anextensive number of experiments covering a relatively large range of variables enabled a comprehensive discussion. First, in the presence of a shortvertical wall, the water level played a key role in the overtopping discharge. In such circumstances, the values of the wave overtopping dischargedecreased with increasing freeboard size. In the presence of a tall freeboard and middle, the value of the wave overtopping discharge was equallyinfluenced by the vertical wall factor. Moreover, the tetrapod size decreased by an increase in the vertical wall factor, and relationship between themresulted in a short wall height. From an engineering point of view, considering a small water level may allow the choice of a shorter vertical wall,which would ultimately provide a more economical design.
참고문헌 (17)
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