检索结果-南通市图书馆

Analysis of Directional Spectra and Reflection Coefficients in incident and Reflected wave Field

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2001年第3期16卷 417-428页

作者：柳淑学俞聿修 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

In this paper, the modified Bayesian method for the analysis of directional wave spectra and reflection coefficients is verified by numerical and physical simulation of waves. The results show that the method can basically separate the incident and reflected directional spectra. In addition, the effect of the type of wave gage arrays, the number of measured wave properties, and the distance between the wave gage array and the reflection line on the resolution of the method are investigated. Some suggestions are proposed for practical application.

关键词： multidirectional waves wave gage array reflection coefficient incident wave wave field

Reflection of Short waves

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 1999年第1期14卷 31-46页

作者： Miguel A. LOSADA University of Cantabria

According to the; energy equation, the relation between reflection and energy losses for short waves from mild beaches is established and analysed. A reflection coefficient varying with position and energy losses is proposed. Different reflection tests are conducted to check the theoretical analysis. A modified method to estimate the reflection coefficient at varied water depths is suggested based on the linear wave theory. The study indicates that the reflection coefficient from mild beaches has a changing trend for short waves approaching shoreline.

关键词： reflection incident wave reflected wave short wave

Theoretical Calculation of Floating Breakwater Performance

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 1992年第4期7卷 415-424页

作者： Lao Guosheng Feng Hong Associate Professor, Dalian University of Technology, 116024, Dalian Postgraduate, Dalian University of Technology, 116024, Dalian

In this paper, the theoretical calculation of floating breakwater performance in regular waves with arbitrary wave direction is discussed. Under the hypothesis of linearized system and applying the strip theory, we can solve the boundary condition problems of diffraction potential and radiation potential. Introducing the asymptotic expression of the wave velocity potential at infinity and using wave energy conservation, we can separately calculate the transmitted waves generated by the sway, heave and roll motion of the floating breakwater and by the fixed breakwater. Finally, we define the amplitude ratio of the transmitted wave to the incident wave as the transmitted wave coefficient CT which describes the floating breakwater effectiveness. Two examples are given and the theoretical results obtained by the present method agree well with experimental results.

关键词： floating breakwater fixed breakwater transmitted wave reflected wave incident wave

A SPECIAL SOLUTION OF wave DISSIPATION BY FINITE POROUS PLATES

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 1992年第4期13卷 353-357页

作者：王晋军 Fluid Mechanics Institute Peking University of Aeronautics and Astronautics Beijing

The reflection and transmission of water waves caused by a small amplitude incident wave through finite fine porous plates with equal spacing and permeability in an infinitely long open channel of constant water depth and zero slope are studied. A special solution is obtained when the distance between the two neighbouring plates is an integral multiple of the half-wavelength of the incident wave. It is found that when the dimensionless porous-effect parameter G0 is equal to half the total plate number, the wave dissipation reaches a maximum, and only 50% of the incident wave energy remains in the reflected and transmitted waves. Meanwhile, the reflected and transmitted waves have the same amplitude.

关键词： wave motion small-amplitude wave linear wave incident wave wave dissipation porous plates