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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(1); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(1): 28-39. doi: https://doi.org/10.9765/KSCOE.2019.31.1.28
해역별 최적 해빈 안정화 공법 선정 Platform 개발을 위한 기초연구- 맹방해변 이송모드별 년 표사수지를 중심으로
조용준1, 김인호2
1서울시립대학교 토목공학과
2강원대학교 지구환경시스템공학과
Preliminary Study on the Development of a Platform for the Selection of Optimal Beach Stabilization Measures against the Beach Erosion - Centering on the Yearly Sediment Budget of Mang-Bang Beach
Yong Jun Cho1, In Ho Kim2
1Department of Civil Engineering, University of Seoul 163 Seoulsiripdaero, Dongdaemun-gu, Seoul 02504 Korea
2Department of Earth and Environmental Engineering, Kangwon National University
Corresponding author: Yong Jun Cho ,Tel: +82-2-6490-2427, Fax: +82-2-6490-2424, Email: young@uos.ac.kr
Received: December 8, 2018;  Revised: February 25, 2019.  Accepted: February 26, 2019.
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ABSTRACT
In the design process of counter measures against the beach erosion, information like the main sediment transport mode and yearly net amount of longshore and cross shore transport is of great engineering value. In this rationale, we numerically analyzed the yearly sediment budget of the Mang-Bang beach which is suffering from erosion problem. For the case of cross sediment transport, Bailard’s model (1981) having its roots on the Bagnold’s energy model (1963) is utilized. In doing so, longshore sediment transport rate is estimated based on the assumption that longshore transport rate is determined by the available wave energy influx toward the beach. Velocity moments required for the application of Bailard’s model (1981) is deduced from numerical simulation of the nonlinear shoaling process over the Mang-Bang beach of the 71 wave conditions carefully chosen from the wave records. As a wave driver, we used the consistent frequency Boussinesq Eq. by Frelich and Guza (1984). Numerical results show that contrary to the Bailard’s study (1981), Irribaren NO. has non negligible influence on the velocity moments. We also proceeds to numerically simulate the yearly sediment budget of Mang-Bang beach. Numerical results show that for β = 41.6o, the mean orientation of Mang-Bang beach, north-westwardly moving longshore sediment is prevailing over the south-eastwardly moving sediment, the yearly amount of which is simulated to reach its maxima at 125,000 m3/m. And the null pint where north-westwardly moving longshore sediment is balanced by the south-eastwardly moving longshore sediment is located at β = 47o. For the case of cross shore sediment, the sediment is gradually moving toward the shore from the April to mid October, whereas these trends are reversed by sporadically occurring energetic wind waves at the end of October and March. We also complete the littoral drift rose of the Mang-Bang beach, which shows that even though the shore line is temporarily retreated, and as a result, the orientation of Mang-Bang beach is larger than the orientation of null pont, southeastwardly moving longshore sediment is prevailing. In a case that the orientation of Mang-Bang beach is smaller than the orientation of null pont, north-westwardly moving longshore sediment is prevailing. And these trend imply that the Mang-Bang beach is stable one, which has the self restoring capability once exposed to erosion.
Keywords: littoral drift rose, yearly sediment budget of the Mang-Bang beach, consistent frequency Boussinesq Eq., skewness of velocity over surf zone, cross shore sediment, Bailard’s model
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