二维岛礁泻湖地形上波浪传播特性的试验研究
发布时间：2018-12-23 20:03
【摘要】：我国南海幅员辽阔,资源丰富,广泛分布了大量的珊瑚岛礁。研究岛屿、岛礁邻近海域的波浪计算对于在珊瑚礁盘顶部修造建筑物以及在泻湖内选建港址等都具有重要的现实意义。由于珊瑚岛礁的存在会引起水深的急剧变化,大多数学者都将岛礁地形简化为台阶地形进行研究,本文主要研究波浪从深水穿越过礁坪顶部传到泻湖的传播过程,因此在前人的基础上,将地形简化为坡度为1：5的陡坡加较长水平礁坪段和泻湖段的地形。采用断面物理模型试验分别对规则波和不规则波在该地形上的传播过程、破碎引起的波浪频谱变化、变形导致的波浪非线性特征参数变化以及波浪的波高分布等进行了系统的分析。对波浪在该地形上的传播过程进行描述,并对礁坪上和泻湖内的波高与礁坪上水深的关系进行分析。对于发生破碎的波浪,讨论破碎引起的波浪频谱变化以及能量转移情况。同时,对于该地形上波浪的不对称度、偏度和Ur参数的沿程变化以及不对称度、偏度与Ur参数之间的关系进行分析。将波浪在该地形上的波高分布与格鲁霍夫斯基分布和瑞利分布进行比较,验证实测特征波高与理论特征波高之间的关系,并对波浪各特征波高之间的关系进行研究。本文初步给出了岛礁泻湖地形上不对称度、偏度与Ur参数关系的经验公式、波浪各特征波高之间关系的拟合公式以及波浪破碎后频谱的变化情况。研究成果可以为实际海洋工程和水深剧变地形上波浪传播的数值模型研究等提供试验依据和参考。
[Abstract]:China's South China Sea has a vast territory and abundant resources, and a large number of coral islands and reefs are widely distributed. It is of great practical significance to study the islands and the waves in the adjacent waters of the islands and reefs for the construction of buildings at the top of the coral reef and for the selection of port sites in the lagoon. Because the existence of coral reef can cause the sharp change of water depth, most scholars simplify the island and reef terrain to step topography. In this paper, the propagation process of waves passing through the top of the reef flat to the lagoon is studied in this paper. Therefore, on the basis of previous studies, the terrain is simplified to that of steep slope with 1:5 slope and long horizontal reef plateau and lagoon section. The cross section physical model test is used to analyze the wave spectrum variation caused by the breaking of regular wave and irregular wave on the terrain, respectively. The variation of wave nonlinear characteristic parameters and wave height distribution caused by deformation are systematically analyzed. The propagation process of waves in this terrain is described, and the relationship between wave height and water depth in lagoons and lagoons is analyzed. In the case of broken waves, the wave spectrum and energy transfer caused by breakage are discussed. At the same time, the relationship between the asymmetry degree, deviation degree and Ur parameter along the course and the asymmetry degree and the Ur parameter are analyzed. The wave height distribution on the terrain is compared with the Grukowski distribution and the Rayleigh distribution. The relationship between the measured characteristic wave height and the theoretical characteristic wave height is verified, and the relationship between the wave characteristic wave heights is studied. In this paper, the empirical formula of the relationship between the asymmetry degree, deviation degree and Ur parameters in the lagoon topography, the fitting formula of the relationship between the wave height and the wave characteristic wave height, and the variation of the frequency spectrum after the wave breaking are given in this paper. The research results can provide experimental basis and reference for practical ocean engineering and numerical model study of wave propagation on the topography of water depth upheaval.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV139.2
本文编号：2390191
[Abstract]:China's South China Sea has a vast territory and abundant resources, and a large number of coral islands and reefs are widely distributed. It is of great practical significance to study the islands and the waves in the adjacent waters of the islands and reefs for the construction of buildings at the top of the coral reef and for the selection of port sites in the lagoon. Because the existence of coral reef can cause the sharp change of water depth, most scholars simplify the island and reef terrain to step topography. In this paper, the propagation process of waves passing through the top of the reef flat to the lagoon is studied in this paper. Therefore, on the basis of previous studies, the terrain is simplified to that of steep slope with 1:5 slope and long horizontal reef plateau and lagoon section. The cross section physical model test is used to analyze the wave spectrum variation caused by the breaking of regular wave and irregular wave on the terrain, respectively. The variation of wave nonlinear characteristic parameters and wave height distribution caused by deformation are systematically analyzed. The propagation process of waves in this terrain is described, and the relationship between wave height and water depth in lagoons and lagoons is analyzed. In the case of broken waves, the wave spectrum and energy transfer caused by breakage are discussed. At the same time, the relationship between the asymmetry degree, deviation degree and Ur parameter along the course and the asymmetry degree and the Ur parameter are analyzed. The wave height distribution on the terrain is compared with the Grukowski distribution and the Rayleigh distribution. The relationship between the measured characteristic wave height and the theoretical characteristic wave height is verified, and the relationship between the wave characteristic wave heights is studied. In this paper, the empirical formula of the relationship between the asymmetry degree, deviation degree and Ur parameters in the lagoon topography, the fitting formula of the relationship between the wave height and the wave characteristic wave height, and the variation of the frequency spectrum after the wave breaking are given in this paper. The research results can provide experimental basis and reference for practical ocean engineering and numerical model study of wave propagation on the topography of water depth upheaval.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV139.2
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