本文選題：長江　切入點：潮流界　出處：《寧夏大學》2017年碩士論文　論文類型：學位論文

【摘要】：長江下游河段水體受上游徑流與下游潮汐共同作用,運動千變萬化,潮流界是其動力變化的重要表征,受多種因素影響,處于不斷移動中,在各類水文情況下的變化特點極為復雜。論文在前人研究的基礎上,結合實測地形資料,利用CJK3D-WEM數學模型,在非結構性網格的基礎上建立了由大通至長江口的二維潮流數值模型,模型對水文資料驗證結果良好,可以準確的對河道中水流運動情況進行模擬。第二、三章從潮位、潮差、漲落潮歷時、潮量等多個角度對不同情況下的長江下游水體特性進行了分析,根據不同徑潮流組合的計算結果討論了在各種條件下徑流、潮流對潮流界的影響作用,結果表明潮流界主要變動范圍由南京附近至白茆河口附近,相比潮汐的變化,徑流的洪枯季變化對潮流界的影響更大。在徑流以同樣速度增加時,潮流界下移速度越來越慢,在潮差以同樣速度增加時,潮流界向上移動速度越來越慢。在第四章中,以江陰水道的部分河段為例剖析了順直河道中地形對于徑潮流動力分配的作用,結果表明在同一斷面中,淺灘中的徑潮比要小于深槽,因此淺灘中的潮流界會在深槽潮流界的上游,且在同樣的徑潮流變化條件下,深槽中的潮流界移動速度會比淺灘快。并且在感潮河段位于潮流界上游部分中,深槽與淺灘中的徑潮比差別較大,而在潮流界的下游河段中,深槽與淺灘中徑潮比的差別較小。
[Abstract]:The water body in the lower reaches of the Yangtze River is affected by the interaction of upstream runoff and downstream tide, and its movement is changeable. The tidal current boundary is an important representation of its dynamic change, which is affected by a variety of factors and is in the process of continuous movement. The variation characteristics of various hydrological conditions are very complicated. On the basis of previous studies and combined with the measured topographic data, the CJK3D-WEM mathematical model is used in this paper. On the basis of non-structural grid, a two-dimensional tidal current numerical model from Datong to Changjiang Estuary is established. The results of hydrological data verification are good, and the flow movement in the river can be accurately simulated. Second, third chapter, from tidal level, tidal range. The characteristics of the lower reaches of the Yangtze River under different conditions are analyzed from the point of view of tidal duration and tidal volume, and the effect of the tidal current on the tidal current boundary under various conditions is discussed according to the calculation results of the combination of tidal currents with different diameters. The results show that the main variation range of tidal current boundary is from Nanjing to Baimao estuary. Compared with tidal variation, flood and dry season variation of runoff has more influence on tidal current boundary. When runoff increases at the same speed, the velocity of tidal current boundary moving down becomes slower and slower. When the tidal range increases at the same speed, the upward movement of tidal current boundary becomes slower and slower. In Chapter 4th, the effect of topography on the dynamic distribution of diameter tidal current in a straight channel is analyzed by taking part of the river reach of Jiangyin waterway as an example. The results show that in the same section, the ratio of diameter to tide in the shoal is smaller than that in the deep trench, so the tidal boundary in the shoal will be upstream of the deep trench, and under the same condition of the variation of the diameter-tidal current, The moving velocity of tidal boundary in deep channel is faster than that in shoal, and in the upper part of tidal boundary, the difference of diameter to tide ratio between deep trough and shoal is great, but in the lower reaches of tidal boundary, the difference between channel and shoal is smaller.
【學位授予單位】：寧夏大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV131.2

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