![]() ![]() Several studies have been conducted on analyzing the transmission characteristics of submerged breakwaters according to their shapes and materials. Therefore, calculating the transmission coefficients of submerged breakwaters is vital to improve the control capacity of wave energy, which is the inherent function of submerged breakwaters. However, despite these advantages, the shoreline alteration and coastal erosion prevention functions of submerged breakwaters remain quite unclear, and there have been cases of erosion behind submerged breakwaters ( Ranasinghe and Turner, 2006). Unlike detached breakwaters, submerged breakwaters are installed underwater therefore they can preserve sea views and minimize environmental pollutants by promoting seawater exchange. Submerged breakwaters are mainly used to reduce erosion damage caused by the incursion of high waves, as well as to protect and nourish the sand. These structures include submerged breakwaters, which are structures that protect beaches by breaking waves that enter from the open sea, thus suppressing wave energy. To prevent coastal erosion, several beach and costal structures are actively being developed and constructed. It was inferred that this numerical study is expected to be used practically in evaluating the design achievement of the submerged breakwater, which is adopted as a countermeasure to coastal beach erosion. The wave period and direction of the incident wave increased, the transmission coefficient decreased, and the wave direction was determined to demonstrate a relatively significant influence on the transmission coefficient. Consequently, the deviation from calculated results appears to practically cover all deviation range in the observed data. Therefore, in this study, we conducted a numerical experiment to verify the influence of wave period on the coefficients of wave transmission, in which we adopted a parabolic-type mild-slope equation model. Although it exhibited robust relationships with the crest height and breaking coefficient, deviations from the observed data were evident and considered to be triggered by the difference in the incident wave climate. After reviewing the existing equations, we proposed a transmission coefficient equation in terms of an error function. Observations were carried out by a pressure-type wave gauge in the Bongpo Beach to evaluate the coefficients of wave transmission via a submerged breakwater, and the results obtained were compared with those of existing conventional equations on the transmission coefficient derived from hydraulic experiments. It significantly contributes to promoting the advancement of shorelines by partially inhibiting incident wave energy. Owing to the advantages of assuring the best views and seawater exchange, submerged breakwaters have been widely installed along the eastern coast of Korea in recent years.
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