大连大窑湾港湾水波振荡研究

发布时间：2018-05-01 20:43

本文选题：大窑湾 + 水波振荡　；参考：《大连理工大学》2014年硕士论文

【摘要】：大窑湾水域呈窄长型,特别是湾底水域更窄,港内水域仅由南、北航道与外海联通,已建泊位多为重力沉箱式(全反射边界)。当波浪自外海经口门传入大窑湾港内时,由于受水下地形和湾内岸线形态等影响,会发生折射和(多次)反射,入射波浪能量耗散困难。上述因素均为港湾水面振荡的诱发因素。大窑湾港区是否会发生水波振荡、发生的条件及强度如何等问题,是全湾规划方案制定过程中重点关注的问题。采用Boussinesq数值波浪模型对上述问题进行研究。首先采用改进的Boussinesq数值波浪模型,模拟白噪声作用下大窑湾全湾水域的波面响应状况,通过频谱分析得到大窑湾港内不同位置水域的响应波幅谱,并与放大因子曲线进行拟合,估计得到大窑湾港内不同位置水域的固有频率。考察了单色波(规则波)和随机波浪入射时全湾水域波面响应状况,发现大窑湾港内不同位置水域的响应状况存在显著差别。故将易发生水面剧烈波动的湾底水域和南岸—期小港池水域视为独立的“湾内湾”,从重点水域的响应波面、频谱及和小波谱三个方面对大窑湾湾底水域、南岸一期小港池水域以及全湾整体水域发生水波振荡的特征进行了全面分析。研究表明： 1.单峰谱波浪作用下,全湾水域发生整体水波振荡的入射波周期约为Tp=60s,远大于当地外海波浪可能出现的周期；湾底和南岸一期小港池局部水域发生水波振荡的最小周期在Tp=11-13s之间,接近当地外海波浪可能出现的周期；因此,湾底和南岸一期小港池局部水域具备发生水波振荡的条件,而全湾整体水域发生水波振荡的可能性不大。 2.双峰谱波浪作用下,在谱能量和双峰谱的低频谱峰频率与单峰谱波浪相同的条件下,与单峰谱作用比较,发生水波振荡的幅度更大。 3.针对大窑湾港内易发生水波振荡的局部水域(湾底和南岸一期小港池水域),提出5种方案,模拟结果显示：在发生水波振荡的局部水域的边界增设孔隙层(反射系数0.7)方案可有效防止湾底和南岸一期小港池水域水波振荡的发生；在北岸28-29号泊位区域保留800m×600m水域方案,可有效减弱湾底水域的振荡。此外,上述两个方案均有提高全湾水域水面平稳度的作用。
[Abstract]:The waters of Dayaowan Bay are narrow and long, especially the bottom waters of the bay are narrower. The waters in the harbor are only connected by the south and north waterways to the outer sea, and most of the berths have been built as gravity caisson (total reflection boundary). When waves pass from the open sea to Dayaowan port, due to the influence of underwater topography and shoreline shape in the bay, refraction and (multiple) reflection will occur, and the energy dissipation of the incident wave will be difficult. All the above factors are the inducing factors of the bay water surface oscillation. Whether there will be water wave oscillation in Dayaowan port area, the conditions and intensity of water wave oscillation, etc. The Boussinesq numerical wave model is used to study the above problems. In this paper, an improved Boussinesq numerical wave model is used to simulate the wave surface response of the whole water area of Dayaowan Bay under white noise. The amplitudes of the response waves in different water areas of Dayaowan Harbour are obtained by spectrum analysis and fitted with the amplification factor curve. The natural frequencies of different water areas in Dayaowan Port are estimated. The response of the whole bay water surface under the incident of monochromatic wave (regular wave) and random wave is investigated. It is found that there are significant differences in the response of different water areas in Dayaowan Harbour. Therefore, the bay bottom waters which are prone to severe water surface fluctuations and the waters of Xiaogang pond on the south coast are regarded as independent "bay inside bay". The response wave surface, spectrum and wavelet spectrum of the key waters are considered to be the bottom waters of Dayaowan Bay from three aspects: the response wave surface, the frequency spectrum and the wavelet spectrum. The characteristics of water wave oscillation in the waters of Xiaogang pond and the whole bay are analyzed. Research shows that: 1. Under the action of single peak wave, the incident wave period of integral water wave oscillation in the whole bay waters is about 60 s, which is much larger than that of the local offshore wave, and the minimum period of water wave oscillation in the local waters of the bay bottom and the first Xiaogang pond in the south coast is between Tp=11-13s. It is close to the possible period of local offshore waves, therefore, the local waters of the bay bottom and the first Xiaogang pool on the south coast have the conditions for water wave oscillation, but the whole bay water area is not likely to occur water wave oscillation. 2. Under the action of bimodal wave, the amplitude of water wave oscillation is larger than that of single peak wave under the condition that the energy of spectrum and the frequency of low spectral peak of bimodal spectrum are the same as those of single peak wave. 3. In view of the local waters in Dayaowan Port which are prone to water wave oscillation (the bay bottom and the waters of the first stage of the Xiaogang pond on the south coast), five schemes are put forward. The simulation results show that the method of adding pore layer (reflection coefficient 0.7) to the boundary of the local waters where water wave oscillation occurs can effectively prevent the occurrence of water wave oscillation in the waters of the bay bottom and the first stage of the Xiaogang pool on the south shore, and retain the water area of 800m 脳 600m in the berth area of No. 28-29 on the north coast. The oscillation in the bottom of the bay can be effectively attenuated. In addition, the above two schemes can improve the water surface stability of the whole bay.
【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】：P731.2

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