本文選題：ECOMSED模型　切入點(diǎn)：三維數(shù)學(xué)模型　出處：《太原理工大學(xué)》2014年碩士論文

【摘要】：河口海岸的泥沙輸運(yùn)問題是人類開發(fā)利用自然資源,從事各種生產(chǎn)活動(dòng)必須要考慮的問題之一。河口泥沙的輸運(yùn)、沉降以及再懸浮等現(xiàn)象均具有三維性,采用潮流泥沙三維數(shù)學(xué)模型能夠較為真實(shí)地模擬近岸河口潮流的運(yùn)動(dòng)特性以及懸浮泥沙與床沙之間的交換過程,因此,許多學(xué)者致力于這方面的研究,但由于泥沙運(yùn)動(dòng)相當(dāng)復(fù)雜,其運(yùn)動(dòng)的機(jī)理、運(yùn)動(dòng)參數(shù)取值均具有不確定性。泥沙數(shù)值模擬還不太成熟,預(yù)報(bào)精度相對較差,結(jié)合工程實(shí)際進(jìn)行的算例也較少。 本文在ECOMSED模型的水動(dòng)力模塊和泥沙輸運(yùn)模塊的基礎(chǔ)上,將三維潮流泥沙數(shù)學(xué)模型應(yīng)用到工程實(shí)際海域中,對羅源灣潮流泥沙輸運(yùn)進(jìn)行了三維數(shù)值模擬,具體工作內(nèi)容和結(jié)論如下： (1)通過查閱國內(nèi)外的大量文獻(xiàn),對三維潮流及其泥沙輸運(yùn)數(shù)學(xué)模型的研究方法、研究現(xiàn)狀等有了較全面的了解。 (2)分析羅源灣水文觀測資料,掌握了源灣水域的自然狀況,包括羅源灣的地形、氣候特性、泥沙來源以及運(yùn)移趨勢、大小潮的水動(dòng)力特性等。 (3)選取2003年的實(shí)測半月潮,進(jìn)行了海域潮流特性的數(shù)值模擬,并將計(jì)算大、小潮K1～K3測點(diǎn)的表層、0.6H以及底層流速與實(shí)測情況進(jìn)行了對比分析,吻合良好。 (4)結(jié)合羅源灣水動(dòng)力以及泥沙輸運(yùn)特性,對泥沙參數(shù)進(jìn)行敏感性分析,選取合理的運(yùn)動(dòng)參數(shù)。 (5)在潮流模擬的基礎(chǔ)上,結(jié)合原體觀測泥沙濃度,給出開邊界的泥沙輸運(yùn)條件,并考慮粘性泥沙的絮凝以及再懸浮過程,對羅源灣三維懸浮泥沙進(jìn)行數(shù)值模擬。 (6)計(jì)算模擬了1年的泥沙沖淤變化過程,為了便于與1999年～2003年的地形變化資料比較,對數(shù)值模擬1年的結(jié)果進(jìn)行線性擴(kuò)展獲得4年淤積情況,給出了大、小潮K1-K3站點(diǎn)垂向平均濃度計(jì)算值以及淤積厚度等值線分布圖,可以較好地反映羅源灣1999～2003年水底地形的變化。 (7)本文在羅源灣實(shí)際觀測資料的基礎(chǔ)上建立的潮流泥沙三維數(shù)學(xué)模型較為合理,能基本反映羅源灣泥沙輸運(yùn)的過程。 (8)研究成果對近岸水域的三維潮流泥沙數(shù)值模型研究具有一定的參考價(jià)值。
[Abstract]:Sediment transport in estuaries and coasts is one of the problems that must be considered in the exploitation and utilization of natural resources. Three-dimensional mathematical model of tidal current and sediment can be used to simulate the movement characteristics of tidal current and the exchange process between suspended sediment and bed sediment. However, because of the complexity of sediment movement, the mechanism of sediment movement and the value of motion parameters are uncertain. The sediment numerical simulation is still immature, the prediction accuracy is relatively poor, and the practical examples are few. Based on the hydrodynamic module and sediment transport module of ECOMSED model, this paper applies 3D tidal current and sediment mathematical model to the actual sea area of engineering, and carries out three-dimensional numerical simulation of tidal current and sediment transport in Luoyuan Bay. The specific elements and conclusions of the work are as follows:. 1) by consulting a large number of literatures at home and abroad, the research methods and present situation of 3D tidal current and sediment transport mathematical model are fully understood. 2) by analyzing the hydrological observation data of Luoyuan Bay, we have mastered the natural conditions of the waters of Luoyuan Bay, including the topography, climatic characteristics, sediment sources and transport trends of Luoyuan Bay, hydrodynamic characteristics of large and small tides, and so on. 3) the numerical simulation of tidal current characteristics in the sea area was carried out by selecting the measured half-moon tide in 2003. The surface layer (0.6H) and the bottom velocity of the K1~K3 measurement point of the large and low tide were compared with the measured results, and the results were in good agreement with the measured results. 4) according to the characteristics of hydrodynamics and sediment transport in Luoyuan Bay, the sensitivity of sediment parameters is analyzed and reasonable motion parameters are selected. 5) on the basis of tidal current simulation and combined with the observation of sediment concentration, the transport conditions of sediment at open boundary are given, and the three dimensional suspended sediment in Luoyuan Bay is numerically simulated considering the flocculation and resuspension process of viscous sediment. In order to compare with the topographic variation data from 1999 to 2003, a 4-year siltation is obtained by linear expansion of the results of the numerical simulation. The calculated values of mean vertical concentration and the contour distribution of deposition thickness at the K1-K3 station of the low tide can well reflect the variation of the bottom topography of Luoyuan Bay from 1999 to 2003. 7) based on the actual observation data of Luoyuan Bay, the three-dimensional mathematical model of tidal current and sediment is reasonable and can basically reflect the process of sediment transport in Luoyuan Bay. The research results have some reference value for the study of three dimensional tidal current and sediment numerical model in coastal waters.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV148

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