Numerical study of transient nonlinear harbor resonance  

作　　者：DONG GuoHai, WANG Gang, MA XiaoZhou & MA YuXiang State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China 

出　　处：《Science China(Technological Sciences)》2010年第2期558-565,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 50679010 and 50921001);Program for New Century Excellent Talents in Universities of China (Grant No. NCET–04–0267);Program for Changjiang Scholars and Innovative Research Teams of Colleges and Universities of China (Grant No. IRT0420)

摘　　要：It is generally accepted that nonlinear wave-wave interactions play an important role in harbor resonance. Nevertheless it is not clear how waves take part in those interactions. The aim of this paper is to investigate those processes for a rectangular harbor at transient phases. Long-period oscillations excited by bichromatic waves are simulated by the Boussinesq model. The simulations start from calm conditions for the purpose of studying the response process. The internal wavemaker stops working after the oscillations have reached a quasi-steady state, and it is used to simulate the damp process. In order to analyze temporary features of wave-wave interactions in different states, the wavelet-based bispectrum is employed. The influence of the short wave frequencies on long-period oscillations is investigated, and reasons are tried to be given from nonlinear triad interactions between different wave components and the interaction of short waves and the bay entrance. Finally, the response time and the damp time are estimated by a simple method.It is generally accepted that nonlinear wave-wave interactions play an important role in harbor resonance. Nevertheless it is not clear how waves take part in those interactions. The aim of this paper is to investigate those processes for a rectangular harbor at transient phases. Long-period oscillations excited by bichromatic waves are simulated by the Boussinesq model. The simulations start from calm conditions for the purpose of studying the response process. The internal wavemaker stops working after the oscillations have reached a quasi-steady state, and it is used to simulate the damp process. In order to analyze temporary features of wave-wave interactions in different states, the wavelet-based bispectrum is employed. The influence of the short wave frequencies on long-period oscillations is investigated, and reasons are tried to be given from nonlinear triad interactions between different wave components and the interaction of short waves and the bay entrance. Finally, the response time and the damp time are estimated by a simple method.

关 键 词：HARBOR RESONANCE infragravity WAVES wavelet-based BISPECTRUM wave-wave INTERACTIONS 

分 类 号：U652[交通运输工程—港口、海岸及近海工程]