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FLOATING BREAKWATER AND ENVIRONMENT
| 题名： | FLOATING BREAKWATER AND ENVIRONMENT |
| 作者： | Jari Silander |
| 关键词： | environment；water；floa；vegetation；alternative；protection；barrier；calibration；scheme；reflection |
| 摘要： | The main target of this research was to study the balance between the protection of environment and breakwater. The design of floating breakwater and different shore protection schemes were included. When designing breakwater the feet that vegetation is greatly affected by wave energy is to be taken into consideration. The floating breakwater and environment are considered by A) improving accuracy to estimate transmission coefficient (Kt) tor a long continuous rigid permeable floating breakwater using physical and numerical models, B) developing a method to estimate extreme conditions in which vegetation would survive and C) comparing various types of shore protection schemes to reduce project expenditures. Based on a model study it can be concluded that the directional spread of wave spectrum, length of the structure or width will often reduce transmission coefficient A fixed breakwater usually creates the lower limit for the transmission coefficient The existence of coastal wetlands was realised to be very dependent on the duration of certain velocity and wave height, but not to plant strength. The vegetation attenuated waves poorly in deep water. A case study of alternative harbour protection schemes indicated that savings could be achieved by testing alternative breakwater cross-sections. The developed numerical model is based on boundary value problem and it predicts wave force, reflection, transmission and eddy dissipation or vortex dissipation, for either plants, wave screens or wave barriers. The linear wave theory was used with the wide space approximation. The symmetric assumption and energy loss calculations incorporated the head loss coefficient and toe effective orifice length for a permeable barrier. The numerical model predicted transmission coefficient for a fixed permeable barrier within 10 % and for a solid barrier within 30% without calibration in regular waves. The energy dissipation in a vortex was up to 50% of toe transmitted wave energy. Numerical model was also successfully used to calculate transmission through vegetation. The developed dynamic erosion resistance and impact function can be used to predict the susceptibility of toe bed to erosion. |
| 报告类型： | 科技报告 |
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