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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/32118

Contributors: NTOU:Department of Harbor and River Engineering
Keywords: Wave transformations;fully nonlinear Boussinesq equations;wave breaking;elliptic shoal;wave focusing
Date: 2011-06
Issue Date: 2012-06-15T07:26:58Z
Publisher: Coastal Engineering Journal
Abstract: abstract:This study investigates wave transformations over an elliptic shoal on a sloping bottom using numerical calculations. The theoretical model is based on the fully nonlinear Boussinesq equation that was applied by Chen et al. [2003]. This equation is expressed by the velocity at any level below the surface. The momentum equation is derived using modified vertical vorticity terms from the equation by Wei et al. [1995]. Bottom friction, wave breaking, and subgrid lateral turbulent mixing proposed by Kennedy et al. [2000] are also included in the equations. Several numerical experiments are conducted for waves with incident angles of 0°, 15°, and 30°. The numerical results demonstrate the phenomena of wave focusing in the rear of the elliptic shoal. The wave focusing not only results in a smaller wave-induced current on top of the shoal than that at the rear of the shoal, but also a strong return flow at the back of the shoal. It is found that the non-dimensional wave height in the wave-focusing zone increases as the relative water depth decreases. Moreover, the orientation of wave height contours in the focusing region is almost identical to that of the incident wave angle. This phenomenon stays true for different incident wave periods.
Relation: Vol. 53, No. 2, pp.151-176
URI: http://ntour.ntou.edu.tw/handle/987654321/32118
Appears in Collections:[河海工程學系] 期刊論文

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