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Numerical Study on Breaking Criteria for Solitary Waves

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China Ocean Engineering 2003年第4期18卷 589-604页

作者： Chung-ren CHOU ruey-syan shih John Z. YIM Department of Harbor and River Engineering Taiwan Ocean University Keelung ChinaDepartment of Civil Engineering Tung Nan Institute of Technology Taipei ChinaDepartment of Harbor and River Engineering Taiwan Ocean University Keelung China

Studies of the breaking criteria for solitary waves on a slope are presented in this paper. The boundary element method is used to model the processes of shoaling and breaking of solitary waves on various slopes. Empirical formulae that can be used to characterize the breaking of solitary waves are presented. These include the breaking index, the wave height, the water depth, and the maximum particle velocity at the point of breaking. Comparisons with the results of other researches are given.

关键词： boundary element breaking indices empirical formula solitary wave

Experimental Investigation of Wave Heights in A Directional Wave Field Through Image Sequences

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China Ocean Engineering 2005年第1期19卷 37-48页

作者： Chung-Ren CHOU Teng-Wei LIN ruey-syan shih John Z. YIMa Department of Harbor and River Engineering National Taiwan Ocean UniversityKeeling 20299 ChinaDepartment of Harbor and River Engineering National Taiwan Ocean UniversityKeeling 20299 ChinaDepartment of Civil Engineering Tung Nan Institute of Technology Taipei 22202 ChinaDepartment of Harbor and River Engineering National Taiwan Ocean UniversityKeeling 20299 China

Measurements of wave heights with image sequences from a Charged Coupled Device(CCD) camera were made. Sinusoidal, as well as unidirectional and directional, waves were used for the experiments. A transfer function was obtained by calibration of the magnitudes of the gray values of the images against the results of wave gauge measurements for directional waves. With this transfer function, wave heights for regular waves were deduced. It is shown that the average relative errors are smaller than 16% for both unidirectional and directional waves.

关键词： charged coupled device remote sensing directional wave transfer function wave height measurements

Dynamic Behaviors of a Moored Floating Structure with Flexible Skirts

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Journal of Energy and Power Engineering 2016年第1期10卷 13-22页

作者： Wen-Kai Weng Duc-Tru Tran ruey-syan shih Research Center for Ocean Energy and Strategies National Taiwan Ocean University Keelung 202 Taiwan R.O.C. Ph.D. Program in Department of Harbor and River Engineering National Taiwan Ocean University Keelung 202 Taiwan R.O.C. Department of Construction and Spatial Design. Tungnan University New Taipei City 222 Taiwan R.O.C

A numerical model was developed by using the dual boundary element method to investigate the dynamic behavior of a moored floating structure with a pair of vertical and flexible skirts attached at its bottom in the linear wave field. Theoretical conception is based on potential theory with linear external forces. The motions of the structure were assumed to be small and linear. The flexible skirts mounted beneath the structure were assumed uniform flexural rigidity and the thickness of the skirts was negligible. Comparison between the present model and Gesraha＇s solution was made to verify the results for a moored floating structure with or without rigid skirts. The influence of the skirt rigidity on the moored floating structure, moored lines and waves is investigated in this study. The results show that, the natural frequencies of structure＇s oscillation, moored force, wave reflection and transmission tend to the region of short-period waves when the flexible rigidity gradually decreases. Positive correlation exists between the aft mooring force and the pitch motion of the floating structure.

关键词： Floating structure dual boundary element method response amplitude operators flexible skirts.

Generation and Deformation of Solitary Waves

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China Ocean Engineering 1996年第4期11卷 419-432页

作者： Chou Chung-Ren shih ruey-syan Professor, Dept. of Harbor and River Engineering, National Taiwan Ocean University . Graduate Student, Dept. of Harbor and River Engineering, National Taiwan Ocean University Dept. of Harbor and River Eng. National Taiwan Ocean University

Base on the Lagrangian description and finite differencing of the time step, the generation, propagation and deformation of solitary waves are simulated numerically by means of boundary element method. An algorithm to generate waves with any prescribed form is also implanted in the scheme, but in this research, solitary waves are studied. The numerical model is first verified by studying the case of a solitary wave impinging against a vertical wall. Time histories of evolution of a soliton running up on a sloping beach, as well as over a submerged obstacle are then presented. Applications to scattering problems due to solitary waves progressing over a slope onto a shelf are also shown.

关键词： Lagrangian description solitary wave boundary element method time histories