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신영섭(Young-Seop Shin),이성대(Seong-Dae Lee) 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.3
A submerged breakwater is one of the coastal structures used to reduce wave energy and coastal erosion. However, a submerged breakwater has a negative aspect in that a strong rip current occurring around an open inlet due to a difference in mean water levels at the front and rear sides of the structure leads to scouring. Such scouring has a bad effect on its stability. In order to eliminate this kind of demerit, this study investigated an artificial reef of the overflow type with openings. We also developed a program where the flows around the artificial reef of the overflow type could be analyzed numerically. An unstructured grid system was used to cover the various geometries, and the level set method was applied to treat the movement of the free surface. To verify these numerical schemes, hydraulic physical tests were performed on the submerged breakwater and double breaking type artificial reef. Then, the wave height and velocity distribution around the reef were examined using the experimental results. Comparisons between the results of hydraulic and numerical tests showed reasonable agreement.
신영섭(Young-Seop Shin),홍창배(Chang-Bae Hong),이성대(Seong-Dae Lee) 한국연안방재학회 2018 한국연안방재학회지 Vol.5 No.1
In this study, we developed the program where the flows around the artificial reef of overflow type can be analyzed numerically. The unstructured grid system is used to cover the various geometries and the level set method is applied to treat the movement of the free surface. To obtain more accurate values of level, the informations of the cell connection in the domain are used to deliver the physical quantities of the free surface to neighbor cells. To verify numerical schemes, the flows in the wave tank of the piston type are simulated and compared with the analytic solutions and our numerical schemes are shown to be valid. The flows around the artificial reef are simulated as varying period and the effectiveness in the aspect of the wave breaking and the construction costs are confirmed.
평면 분산된 인공어초 집합의 어초협곡 간격에 따른 후류체적 특성
정소미(Somi Jung),김동하(Dongha Kim),나원배(Won-Bae Na) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.3
Considering the artificial reef (AR) canyon intervals facilitated by flatly distributed placement models, the wake volumes of 25 AR sets were characterized through the following works. First, twenty-five different canyon intervals were established to investigate how the intervals affect the wake volumes of the AR placement models, each with nine cube-type ARs. Second, the element-based finite-volume method was used to facilitate flow analyses. Third, the so-called wake volume concept was adopted, and finally a reasonable placement interval was found based on the size of the wake volumes and the associated unit propagation indices. From the analysis results, it was found that a maximum wake volume of 25.18 m³ was generated when the longitudinal and transverse intervals were fixed at 6 m and 0 m, respectively. Thus, to magnify the wake volume, it is recommended that artificial reefs be placed at intervals of 6 m (3 times the reef length) in the flow direction, with no intervals in the normal direction, implicitly indicating that an intensively stacked placement model is a better option to efficiently secure a larger wake volume for the cube-type ARs.
김창길(Chang Gil Kim),김호상(Ho Sang Kim),서장우(Jang Woo Seo),정금철(Geum Chul Jung) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
This study describes the optimum size of a reef set in Korean coastal waters. Data were analyzed in relation to the weight and variety of fish species caught with a three-layer gill net. The results did not indicate a significant difference in the mean catch and mean number of fish species among the three different reef sets, 800, 1,600 and 2400 ㎥.