港口共振的能量演变研究

发布时间：2018-05-19 20:38

本文选题：港湾共振 + Boussinesq波浪模型　；参考：《大连理工大学》2014年硕士论文

【摘要】：随着人类对海洋资源需求的不断扩张,港口海岸工程得到了充分的发展,在国民经济的发展中扮演着不可或缺的角色。然而由于复杂多变的海洋环境,严重影响着港口安全并制约着港口的发展。由于当沿海港湾受到外海风浪、涌浪、次重力波以及海啸等因素的影响,会有可能诱发港湾共振现象,甚至会威胁到港口的稳定,对港口码头的正常运转造成影响,严重时会造成港口建筑物的破坏并给当地的经济带来巨大的损失和造成生命安全。因此,在港口的设计和规划中有必要考虑港口共振现象。本文首先通过列举近几十年来国内外发生的众多港湾振荡事件介绍了港口共振课题的研究背景及其研究意义,并就国内外学者对港湾振荡问题的物理模型实验和数值模型研究进展进行了综述。接着对本文基于改进的Boussinesq方程所建立的MIKE21-BW数学模型展开了论述,文中还对该Boussinesq方程及其对应的数值解法进行了详细阐述,同时介绍了MIKE21-BW波浪模型及其处理边界层的方法。文章通过MIKE21-BW数值模型模拟了波浪激发平底细长港湾、圆形港湾、双圆形港湾和不规则形状港湾的港口共振能量变化过程,并且模拟了波浪以港池的第一自振频率进入港池内水体共振响应的过程以及在停止波浪入射后港内水面波动衰减的过程。其中入射波浪频率采用港口第一特征频率。当入射波以该频率从外海传入港内,会引发港内水体形成共振现象。由于港内波面的扰动是一个随时间变化的瞬态过程,通过连续小波谱分析波面信号,研究波浪进入湾内时其响应阶段的成长和耗散阶段的衰减过程,给出了一种指数形式的公式来估计港口在共振开始响应和结束衰减所需要的时间。
[Abstract]:With the continuous expansion of human demand for marine resources, port and coastal engineering has been fully developed and plays an indispensable role in the development of national economy. However, because of the complex and changeable marine environment, the port security is seriously affected and the development of the port is restricted. When coastal harbors are affected by sea waves, surges, secondary gravity waves and tsunamis, it may induce harbour resonance, and even threaten the stability of the port, which will have an impact on the normal operation of the port wharf. Serious damage to port buildings and to the local economy caused great loss of life and safety. Therefore, it is necessary to consider port resonance in port design and planning. This paper first introduces the research background and significance of port resonance by enumerating a large number of harbour oscillation events at home and abroad in recent decades. The progress of physical model experiments and numerical models of harbour oscillation is reviewed. Then the MIKE21-BW mathematical model based on the improved Boussinesq equation is discussed in this paper. The Boussinesq equation and its corresponding numerical solution are also described in detail. The MIKE21-BW wave model and the method to deal with the boundary layer are also introduced. In this paper, MIKE21-BW numerical model is used to simulate the variation process of resonance energy in wave excited slender, circular, double circular and irregular shaped harbors. The resonance response of the waves entering the harbour pool at the first natural frequency of the port pool and the attenuation process of the wave fluctuation in the harbour after stopping the wave incident are also simulated. The incident wave frequency adopts the first characteristic frequency of the port. When the incident wave is transmitted from the offshore to the port at this frequency, the resonance of the water body in the port will be induced. Because the disturbance of the wave surface in the harbour is a transient process varying with time, the wave surface signal is analyzed by continuous wavelet spectrum to study the growth of the wave response stage and the attenuation process of the dissipation stage when the wave enters the bay. An exponential formula is given to estimate the time required for the port to respond to and end the resonance attenuation.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U652.3;P731.2

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