本文選題：譜平均周期 + 跨零點周期�。� 參考：《大連理工大學》2016年碩士論文

【摘要】：海浪要素(如波高、周期)是工程設計普遍關注的重要環(huán)境條件,特別是有效波高和有效周期是至關重要的設計波要素。目前,在海洋工程環(huán)境條件推算中盛行利用海浪數(shù)值模式計算海浪要素,如國際上流行的數(shù)值模型SWAN、WAVEWATCH可直接給出有效波高及與譜相關的特征周期,但由此得到的周期值和實測值之間往往存在很大的偏差。這種差異主要源于對影響波浪發(fā)展的各種物理過程參數(shù)化的不準確性,波浪破碎就是其中之一,破碎能量損耗是海浪模型能量耗散項中重要的物理機制。由于波浪破碎是極其復雜的物理過程,目前對此過程中能量耗散機制了解仍較少,還有待深入研究,對破碎過程周期的變化情況也缺少系統(tǒng)的研究。針對上述問題,本文根據(jù)室內(nèi)試驗,探討了深水極限波浪破碎及淺水波浪變形破碎過程特征周期的演化規(guī)律。第二章中,首先給出了極限波浪的生成方法-波能聚焦法,在實驗室二維水槽中生成不同參數(shù)的深水聚焦波和破碎波,研究了聚焦波和破碎波波面的演化特性,重點分析了各種特征周期的演化規(guī)律。另外,還研究了頻譜分布形式、頻率寬度對周期演化的影響；在第三章中,首先介紹了試驗地形設置,在實驗室水槽中布置一坡度為1：15的斜坡平臺地形,進行規(guī)則波和不規(guī)則波在斜坡平臺上傳播變形的試驗,研究波浪在淺水中傳播變形特征,重點分析各種特征周期的演化規(guī)律,并分析了入射波周期對波浪周期演化的影響；第四章中,總結(jié)了表征波浪非線性作用及破碎強度的參數(shù),分析波浪非線性傳播破碎后周期變化率與這些特征參數(shù)的關系,并通過最小二乘法擬合給出相應的關系式。本文通過物理模型試驗,對深水極限波浪破碎、淺水波浪破碎過程周期的演化特征進行了分析,并探討了周期變化率與表征波浪破碎強度或非線性的特征參數(shù)的關系,研究成果可為海洋工程設計和數(shù)值模型的改進提供依據(jù)。
[Abstract]:Wave elements (such as wave height and period) are important environmental conditions of engineering design, especially the effective wave height and effective period are the most important design wave elements. At present, ocean wave numerical model is widely used to calculate ocean wave elements in the calculation of marine engineering environmental conditions. For example, Swann WAVEWATCH, a popular international numerical model, can directly give the effective wave height and characteristic periods related to the spectrum. But there is often a big deviation between the period value and the measured value. The difference is mainly due to the inaccuracy of parameterization of various physical processes affecting wave development, among which wave breakage is one of the most important physical mechanisms of energy dissipation in wave model. Because wave breakage is an extremely complex physical process, the mechanism of energy dissipation in this process is still less understood, which needs to be further studied, and the variation of the period of breaking process is also lack of systematic research. In view of the above problems, based on the laboratory tests, this paper discusses the evolution law of the characteristic periods of the deep water limit wave breakage and the shallow water wave deformation breakage process. In the second chapter, the method of wave energy focusing, which is the generation method of limit wave, is first given. Different parameters of deep water focused wave and broken wave are generated in the laboratory two-dimensional flume, and the evolution characteristics of focused wave and broken wave surface are studied. The evolution law of various characteristic periods is analyzed in detail. In the third chapter, the experimental terrain setting is introduced, and a slope platform terrain with a slope of 1:15 is arranged in the laboratory tank. The propagation and deformation characteristics of regular and irregular waves in shallow water are studied, and the evolution laws of various characteristic periods are analyzed, and the influence of incident wave periods on wave periodic evolution is analyzed. In chapter 4, the parameters that characterize the nonlinear action and breaking strength of waves are summarized, and the relationship between the rate of periodic change and these characteristic parameters after wave nonlinear propagation breaking is analyzed, and the corresponding relationship is obtained by least square method. In this paper, through physical model tests, the evolution characteristics of the cycle of wave breaking in deep water and shallow water are analyzed, and the relationship between the rate of periodic variation and the characteristic parameters that characterize the breaking strength or nonlinearity of waves is discussed. The research results can provide the basis for the improvement of ocean engineering design and numerical model.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：P731.22;P75

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本文編號：1997121