【摘要】：波浪對河口海岸地區(qū)泥沙輸運(yùn)和海底地形演變的影響是實(shí)際海岸工程中最關(guān)心的難點(diǎn)問題之一。如今,計(jì)算機(jī)技術(shù)的發(fā)展日新月異,數(shù)值模擬技術(shù)在海岸工程中的應(yīng)用也更加廣泛。目前,國內(nèi)外對于波流共同作用下的泥沙數(shù)值模擬的研究取得了很大的進(jìn)展。建立考慮波流相互影響的數(shù)值模型,在相關(guān)海域開展水動力以及物質(zhì)輸運(yùn)的數(shù)值模擬,對海洋工程、海岸防護(hù)、環(huán)境保護(hù)等方面有著重要的意義。 本文以陸域岸線幾乎全部人工化的大連灣為研究對象,將波浪場產(chǎn)生的輻射應(yīng)力耦合到潮流運(yùn)動方程和懸沙輸運(yùn)方程中,采用非結(jié)構(gòu)化網(wǎng)格對計(jì)算區(qū)域進(jìn)行剖分,建立了波流共同作用下的二維懸沙數(shù)學(xué)模型。純潮流作用下、常浪作用下、強(qiáng)浪作用下的模擬結(jié)果進(jìn)行分析表明：由于常浪的波高與周期都較小,以及大連灣的水深較大、周圍沒有泥沙來源等因素,常浪作用下,波浪對大連灣流場、懸沙濃度、海床沖淤變化均無明顯改變；但在惡劣天氣時(shí),強(qiáng)浪對大連灣流場、懸沙濃度、海床沖淤變化有較明顯的影響。
[Abstract]:The influence of wave on sediment transport and submarine topography evolution in estuarine and coastal areas is one of the most difficult problems in practical coastal engineering. Nowadays, with the rapid development of computer technology, numerical simulation technology is more widely used in coastal engineering. At present, great progress has been made in the research of sediment numerical simulation under the interaction of wave and current at home and abroad. The numerical model considering the interaction of waves and currents and the numerical simulation of hydrodynamic and mass transport in the relevant sea areas are of great significance to marine engineering, coastal protection, environmental protection, and so on. In this paper, the radiation stress generated by wave field is coupled to tidal current motion equation and suspended sediment transport equation, and the unstructured grid is used to divide the calculated area. A two-dimensional suspended sediment mathematical model under the action of wave and current is established. The simulation results under pure tidal current, constant wave and strong wave show that the wave height and period are small, and the water depth of Dalian Bay is larger, and there is no sediment source around it. The wave has no obvious change on the current field, suspended sediment concentration and the scour and deposition of the seabed in Dalian Bay. But in the severe weather, the strong waves have obvious influence on the current field, suspended sediment concentration and the sea bed scour and silt change in Dalian Bay.
【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】：2014
【分類號】：TV148

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本文編號：2357599