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Evaluation of Fluid Forces Acting on Offshore Structures Placed in the Vicinity of Underwater Shoal  

Chun, In-Sik (Department of Civil Engineering, Konkuk University)
Min, In-Ki (Coastal and Harbor Engineering Division, Korea Ocean Research and Development Institute)
Sim, Jae-Seol (Coastal and Harbor Engineering Division, Korea Ocean Research and Development Institute)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.19, no.2, 2007 , pp. 136-145 More about this Journal
Abstract
When waves propagating over an underwater shoal break at the top of the shoal, wave heights are drastically decreased in the downstream breaking zone, but a secondary current shooting downstream with strong velocity can be induced by the breaking waves themselves. In the case that an offshore structure is placed in the breaking zone, the estimation of wave farce purely based on the visible wave height may cause an under-design of the structure. Thus, for the safe design of the structure, the breaking wave induced current should be necessarily considered in the comprehensive estimation of design load. In the present study, Boussinesq equation model to calculate the wave height distribution and breaking wave induced current was set up and applied to the scheme of a hydraulic model test previously undertaken. Based on the results of the Boussinesq model, fluid forces acting on the model structure were calculated and compared with the experimental results. The importance of the breaking wave induced current was quantitatively assessed by comparing fluid forces with or without current.
Keywords
wave force; wave induced current; breaking wave; Boussinesq equation model; underwater shoal; Morison equation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 한국해양연구원 (2002). 2001 이어도 종합해양과학기지 구축사업 보고서
2 Shapiro, R. (1970). Smoothing, filtering, and boundary effects, Review of geophysics and space physics, 8(2), 359-386   DOI
3 전인식, 김귀동, 심재설 (2006). 수중 천퇴에서의 쇄파거동 예측을 위한 Boussinesq 방정식 모델의 적용, 한국해안.해양공학회지, 154-165   과학기술학회마을
4 전인식, 심재설, 최성진 (2000a). 이어도 종합해양과학기지 에 대한 설계파력의 검토 I: 삼차원 수리모형실험, 한국해안.해양공학회지, 157-167
5 전인식, 심재설, 최성진 (2000b). 이어도 종합해양과학기지에 대한 설계파력의 검토 II: 쇄파역에서의 유체력, 한국해안.해양공학회지, 168-180
6 Wei, G., Kirby, J.T., Grilli, S.T. and Subramanya, R. (1995). A fully nonlinear Boussinesq model for surface waves, Part 1, highly nonlinear unsteady waves, J. Fluid Mechanics, 294, 71-92   DOI   ScienceOn
7 Dawson, T.H. (1983). Offshore Structural Engineering, Prentice-Hall, 124-126
8 전인식, 성상봉, 김귀동, 심재설 (2005). Boussinesq 방정식을 이용한 수중 천퇴에서의 파랑변형 및 파랑류 계산, 한국해안.해양공학회지, 202-212
9 SPM, (1977). Shore Protection Manual, Coastal Engineering Research Center, Corps of Engineers, U.S. Army
10 Nwogu, O. (1993). Alternative form of Boussinesq equation for nearshore wave propagation, J. Wtrway., Port, Coast. and Oc. Engrg., ASCE, 119(6), 618-638   DOI   ScienceOn
11 Kennedy, A.B, Chen, Q., Kirby, J.T. and Dalrymple, R.A. (2000). Boussinesq modelling of wave transformation, breaking, and runup. I: 1D., J. Wtrwy, Port, Coast. and Oc. Engrg., 126, 39-47   DOI   ScienceOn
12 전인식, 김귀동, 이성엽 (2007). 비선형 불규칙 파랑전파모델의 쇄파거동에 대한 수치해석, 한국해양연구원 위탁연구과제 보고서, 79 p
13 Yoon, S., Cho, Y. and Lee, C. (2004). Effects of breakinginduced currents on refraction-diffraction of irregular waves over submerged shoal, Ocean Engineering, 31, 633-652   DOI   ScienceOn