發(fā)布時間：2018-04-28 08:43

  本文選題：剛性植被 + Boussinesq方程��； 參考：《大連理工大學(xué)》2016年碩士論文

【摘要】：海岸植被能有效地降低波浪對岸灘的侵蝕作用。波浪在植被水域傳播過程中,部分波能將被消耗,波高隨之衰減,有效地降低了波浪對岸灘的侵蝕作用；同時,隨著波高的衰減,波浪的物質(zhì)輸運能力也隨之降低,對近岸水環(huán)境的演變有重要影響。然而,隨著海岸資源的開發(fā)以及海岸工程的修建改變了該區(qū)域原有的植被形態(tài)及分布,影響到海岸波浪、流等水動力的運動環(huán)境,并對近岸物質(zhì)輸運產(chǎn)生重要影響。因此,研究近岸植被影響下波浪的傳播變形對分析近岸資源開發(fā)對近岸水動力及物質(zhì)輸運、岸灘穩(wěn)定等有重要理論指導(dǎo)和工程應(yīng)用價值。本文基于Boussinesq方程的波浪運動模型建立了近岸剛性植被水域波浪傳播的數(shù)值模型,在對所建模型的可靠性進行驗證的基礎(chǔ)上,利用該模型模擬分析了植被特征參數(shù)以及入射波要素對波浪的傳播變形、孤立波的爬坡運動的影響,得出結(jié)論如下：(1)波浪在近岸植被水域傳播運動過程中,隨著植被密度、植被淹沒高度的增加,入射波的波能損耗程度、波高衰減程度愈加劇烈。(2)波浪在植被水域傳播運動過程中,入射波的波能損耗與植被區(qū)域的分段方式密切相關(guān)。假設(shè)植被總量一定,與單段植被的分布方式相比,分段植被的排列方式能更大幅度地耗損入射波的波能,但隨著分段次數(shù)的增加,波能損耗程度趨于穩(wěn)定。(3)波浪在近岸植被水域傳播運動過程中,隨著入射波波高的增加,入射波的波能損耗程度、波高衰減程度愈加劇烈。(4)在孤立波在爬坡運動過程中,植被的特征參數(shù)對孤立波的爬坡、退水過程有著重要影響。分析發(fā)現(xiàn),植被的存在能有效地耗損孤立波的波能,降低孤立波的爬高,使植被區(qū)域前的水位產(chǎn)生一定程度的壅高,且孤立波的爬坡時刻會有一定程度的滯后,退水時刻有一定程度的提前；隨著植被密度、植被淹沒高度的增加,孤立波波能損耗程度愈加劇烈,植被區(qū)域前水位的壅高程度會加強,且孤立波爬坡時刻的滯后程度和退水時刻的提前程度會越來越強；此外,斜坡上植被的分布方式對孤立波爬坡過程也有重要影響。
[Abstract]:The coastal vegetation can effectively reduce the wave erosion to the shoreline. In the process of wave propagation in vegetation waters, some wave energy will be consumed and wave height will attenuate, which can effectively reduce the erosion effect of wave on shoreline, and at the same time, with the attenuation of wave height, the transport capacity of wave will also decrease. It has an important influence on the evolution of coastal water environment. However, with the development of coastal resources and the construction of coastal engineering, the original vegetation pattern and distribution in the region have been changed, which has affected the hydrodynamic environment such as coastal waves and currents, and has an important impact on the transport of material along the shore. Therefore, the study of wave propagation and deformation under the influence of inshore vegetation has important theoretical guidance and engineering application value in the analysis of coastal resources development for coastal hydrodynamic and material transport, shoreline stability and so on. Based on the wave motion model of Boussinesq equation, the numerical model of wave propagation in coastal rigid vegetation waters is established in this paper, and the reliability of the model is verified. The model is used to simulate and analyze the effects of the characteristic parameters of vegetation and the elements of incident wave on the wave propagation deformation and the climbing motion of the solitary wave. The conclusions are as follows: 1) the wave propagates along the coastal vegetation waters with the vegetation density. With the increase of vegetation submergence height, the wave energy loss of the incident wave and the attenuation degree of the wave height become more and more intense. (2) the wave energy loss of the incident wave is closely related to the segmented pattern of the vegetation area during the propagation of the wave in the vegetation waters. Assuming that the total amount of vegetation is constant, compared with the distribution mode of single segment vegetation, the arrangement of segmented vegetation can consume the wave energy of incident wave to a greater extent, but with the increase of segmentation times, In the process of wave propagation in coastal vegetation waters, with the increase of the incident wave height, the wave energy loss of the incident wave and the attenuation degree of the wave height become more intense. 4) in the process of the solitary wave climbing, the wave energy loss tends to be stable. The characteristic parameters of vegetation play an important role in the process of slope climbing and water retreating. It is found that the existence of vegetation can effectively consume the wave energy of the solitary wave, reduce the climbing of the solitary wave, cause the water level in front of the vegetation area to be raised to a certain extent, and lag the climbing time of the solitary wave to a certain extent. With the increase of vegetation density and the height of vegetation inundation, the energy loss of solitary wave becomes more and more severe, and the high level of water level in front of vegetation area will be strengthened. In addition, the distribution of vegetation on the slope also has an important effect on the climbing process of the solitary wave.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TV139.2

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本文編號：1814571