Browse > Article

Behavior of Overtopping Flow of Caisson Breakwater with Dissipating Block: Regular Wave Conditions  

Ryu, Yong-Uk (Coastal and Harbor Research Division, KICT)
Lee, Jong-In (Coastal and Harbor Research Division, KICT)
Kim, Young-Taek (Coastal and Harbor Research Division, KICT)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.21, no.1, 2009 , pp. 54-62 More about this Journal
Abstract
The present study investigates the behaviour of overtopping flows falling on the leeside of a caisson breakwater with dissipating blocks through laboratory measurements. The falling overtopping flows in the leeside are expected to directly affect the leeside stability of the breakwater. This study focuses on not the resultant stability but the characteristic pattern of the overtopping flows depending on wave conditions through examining front velocity and plunging distance in the leeside. Regular waves were used to investigate the dependence of the overtopping flow pattern on wave conditions and a modified image velocimetry combining the shadowgraphy and cross-correlation method was employed for measurements of image and velocity. From the measurements, it is shown that the plunging distance and front velocity of the overtopping flow in the breakwater leeside increase as the wave period or height increases. From non-dimensional relationships between the variables, empirical formula for the velocity and overtopping distance are suggested.
Keywords
hydraulic model test; shadowgraphy; overtopping; overtopping jet; overtopping velocity; plunging distance;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 오정은, 서경덕, 권혁민 (2006). 호안에서의 월파에 대한 신뢰성 해석. 한국해안.해양공학회지, 18(1), 69-83
2 유용욱, 이종인, 김영택 (2007). 쇄파에 의한 처오름과 월파 유속. 한국해안.해양공학회지, 19(6), 606-613
3 Ryu, Y., Chang, K.-A. and Lim, H.-J. (2005). Use of bubble image velocimetry for measurement of plunging wave impinging on structure and associated greenwater. Meas. Sci. Tech., 16, 1945-1953   DOI   ScienceOn
4 Van Dijk, B (2001). The Rear Slope Stability of Rubble Mound Breakwaters. MS thesis, Delft U of Tech
5 Verhagen, H.J., Van Dijk, B. and Nederpel, A. (2003). Riprap Stability on the Inner Slopes of Medium-Height Breakwaters. Proc. Coast. Struc. 2003, Portland. 213-222
6 Anderson, O.H., Juhl, J. and Sloth, P. (1992). Rear Side Stability of Berm Breakwaters. Proc. 23rd Coast. Engrg. Conf., ASCE, 1020-1029
7 Govender, K., Mocke, G.P., and Alport, M.J. (2002). Videoimaged surf zone wave and roller structures and flow fields. J. Geophy. Res., 107, 3072   DOI
8 Van Gent, R.A. and Pozueta, B. (2004). Rear-side Stability of Rubble Mound Structures, Proc. 29th Coast. Engrg. Conf., ASCE.3481-3493
9 Chang, K.-A. and Liu, P.L.-F. (1999). Experimental investigation of turbulence generated by breaking waves in water of intermediate depth. Physics of Fluids, 11, 3390-3400   DOI
10 Kudale, M.D. and Kobayashi, N. (1996). Hydraulic stability analysis of leeside slope of overtopped breakwaters. Proc. 25th Coast. Engrg. Conf., ASCE, 1721-1734
11 이철응 (2003). 월파에 대한 경사식 해안 구조물의 신뢰성 해석. 한국해안.해양공학회지, 15(4), 214-223