Numerical Simulation of Multi-Directional Random Wave Transformation in a Yacht Port  

作　　者：JI Qiaoling DONG Sheng ZHAO Xizeng ZHANG Guowei 

机构地区：[1]College of Engineering,Ocean University of China,Qingdao 266100,P.R.China [2]Department of Ocean Science and Engineering,Zhejiang University,Hangzhou 310058,P.R.China [3]Offshore Oil Engineering(Qing Dao)Co.,Ltd.,Qingdao 266520,P.R.China

出　　处：《Journal of Ocean University of China》2012年第3期315-322,共8页中国海洋大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (50879085);the Program for New Century Excellent Talents in University(NCET-07-0778);Fundamental Research Funds for the Central Universities (2012QNA4020)

摘　　要：This paper extends a prediction model for multi-directional random wave transformation based on an energy balance equation by Mase with the consideration of wave shoaling, refraction, diffraction, reflection and breaking. This numerical model is improved by 1) introducing Wen's frequency spectrum and Mitsuyasu's directional function, which are more suitable to the coastal area of China; 2) considering energy dissipation caused by bottom friction, which ensures more accurate results for large-scale and shallow water areas; 3) taking into account a non-linear dispersion relation. Predictions using the extended wave model are carried out to study the feasibility of constructing the Ai Hua yacht port in Qingdao, China, with a comparison between two port layouts in design. Wave fields inside the port for different incident wave directions, water levels and return periods are simulated, and then two kinds of parameters are calculated to evaluate the wave conditions for the two layouts. Analyses show that Layout I is better than Layout II. Calculation results also show that the harbor will be calm for different wave directions under the design water level. On the contrary, the wave conditions do not wholly meet the requirements of a yacht port for ship berthing under the extreme water level. For safety consideration, the elevation of the breakwater might need to be properly increased to prevent wave overtopping under such water level. The extended numerical simulation model may provide an effective approach to computing wave heights in a harbor.This paper extends a prediction model for multi-directional random wave transformation based on an energy balance equation by Mase with the consideration of wave shoaling, refraction, diffraction, reflection and breaking. This numerical model is improved by 1） introducing Wen＇s frequency spectrum and Mitsuyasu＇s directional function, which are more suitable to the coastal area of China; 2） considering energy dissipation caused by bottom friction, which ensures more accurate results for large-scale and shallow water areas; 3） taking into account a non-linear dispersion relation. Predictions using the extended wave model are carried out to study the feasibility of constructing the Ai Hua yacht port in Qingdao, China, with a comparison between two port layouts in design. Wave fields inside the port for different incident wave directions, water levels and return periods are simulated, and then two kinds of parameters are calculated to evaluate the wave conditions for the two layouts. Analyses show that Layout I is better than Layout II. Calculation results also show that the harbor will be calm for different wave directions under the design water level. On the contrary, the wave conditions do not wholly meet the requirements of a yacht port for ship berthing under the extreme water level. For safety consideration, the elevation of the breakwater might need to be properly increased to prevent wave overtopping under such water level. The extended numerical simulation model may provide an effective approach to computing wave heights in a harbor.

关 键 词：random wave diffraction energy balance equation numerical simulation yacht port 

分 类 号：P641.2[天文地球—地质矿产勘探] P731.22[天文地球—地质学]