港湾共振是指半封闭港湾在受到外力作用下出现的周期性水面波动现象。它可使停靠在码头的船舶产生大幅晃动甚至导致断缆及翻船等事故，一直是海岸工程研究的热点问题之一。本项目采用理论分析、数值模拟与模型试验相结合的方法，从港湾的平面形状和水深变化这两个重要影响因素出发，探索其对港湾共振的影响机理。研究各种不同形状港湾内的水波共振，揭示波浪运动的混沌现象与港湾共振间的关系，探求不发生共振或共振最小的港湾形状。推导变水深港湾内水波共振的运动形式，分析水深变化对港湾共振的影响；从纵向与横向共振间非线性相互作用探讨变水深港湾内横向共振的诱发机理；并进行数值模拟和模型试验验证。.本研究工作的开展将揭示平面形状和水深变化对港湾共振的影响机理，加深港湾共振这一特殊波浪运动的本质认识，为进一步研究如何有效地减小和避免这一危害提供理论基础。

When ocean waves of certain periods come into a harbor opening, they are often trapped and amplified. The phenomenon of such external energy trapped in a semi-enclosed domain and exciting large oscillations is called harbor resonance. It can create unacceptable vessel motions, leading to breaking of mooring lines or shipwrecks, and has been one of the hot issues in coastal engineering. Harbor resonance is significantly affected by the geometric and depth. The project will investigate effects of geometries on harbor resonance by theoretical analysis and numerical simulations; and propose optimal shapes by comparing oscillations within different shapes, in which shapes the resonance is smallest; and then conduct experiments to verify them. Formulary descriptions of oscillations within a harbor of variable depth will be derived, and the effect of water depth on harbor resonance will be examined. The generation mechanism of transverse resonance within the harbor of variable depth will be investigated from the nonlinear interaction between longitudinal and transverse oscillations. Numerical simulations and physical experiments will be further conducted to verify the results. .The project is hoped to reveal the effects of shape and depth on harbor resonance, and improve the understanding of this phenomenon, which is essential for a good harbor design in real.