本文選題：錢塘江河口　切入點：極限沖刷　出處：《浙江大學(xué)》2014年碩士論文

【摘要】：錢塘江兩岸人口稠密,經(jīng)濟(jì)發(fā)達(dá),已建或擬建多座橋梁、隧道,這些水下建筑物一旦遭遇破壞,將會帶來極大的社會影響或災(zāi)難,導(dǎo)致這些涉水工程破壞的一個重要因素就是錢塘江河口地區(qū)的沖刷問題。河口地區(qū),洪水與潮流交替作用,河床沖淤幅度十分劇烈,因此開展錢塘江河口地區(qū)極限沖刷深度的研究,對于隧道、橋梁、排污口等涉水工程具有重要的意義。 本論文以錢江通道河段為例,構(gòu)建了錢江通道河段整體物理模型,研究了自然情況下的河床極限沖刷,經(jīng)定床水流、動床地形驗證,模型可靠性較高,同時運用水槽模型探討了丁壩等局部工程在洪、潮水作用下對河床沖刷的疊加影響,進(jìn)而預(yù)測了錢江通道最終的河床設(shè)計高程。 運用水槽斷面模型試驗方法,模擬了錢江通道河段自然條件下的河床極限沖刷,研究了極限沖刷下河床的沖刷機(jī)理與過程,并就影響極限沖刷的水深、流速等主要因子進(jìn)行了分析,建立了基于量綱分析及多元回歸法的河床極限沖刷計算公式。
[Abstract]:The Qiantang River is densely populated and economically developed. Many bridges and tunnels have been built or are planned to be built. Once these underwater buildings are damaged, they will bring great social impact or disaster.The erosion of Qiantang River estuary is an important factor leading to the destruction of these wading projects.In estuarine area, the river bed scour and silt range is very intense because of the alternant action of flood and tidal current, so it is of great significance to carry out the study of limit scour depth in Qiantang River estuary area for tunnel, bridge, sewage outlet and so on.Taking the Qianjiang channel reach as an example, a physical model of Qianjiang channel reaches is constructed in this paper. The model is highly reliable by studying the limit scour of the river bed under natural conditions, which is verified by the fixed bed flow and the moving bed topography.At the same time, the superposition effect of local engineering such as spur dike on the river bed erosion under the action of flood and tide is discussed by using the flume model, and the final river bed design elevation of the Qianjiang channel is predicted.By using the model test method of flume section, the paper simulates the ultimate scour of the riverbed under natural conditions in the Qianjiang channel, studies the erosion mechanism and process of the riverbed under the ultimate scour, and studies the water depth which affects the ultimate scour.The main factors, such as velocity, are analyzed, and the calculation formula of river bed limit erosion based on dimensional analysis and multivariate regression method is established.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV149

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本文編號：1721528