钱塘江河口钱江通道河段极限冲刷试验研究

发布时间：2018-04-08 12:02

本文选题：钱塘江河口　切入点：极限冲刷　出处：《浙江大学》2014年硕士论文

【摘要】：钱塘江两岸人口稠密,经济发达,已建或拟建多座桥梁、隧道,这些水下建筑物一旦遭遇破坏,将会带来极大的社会影响或灾难,导致这些涉水工程破坏的一个重要因素就是钱塘江河口地区的冲刷问题。河口地区,洪水与潮流交替作用,河床冲淤幅度十分剧烈,因此开展钱塘江河口地区极限冲刷深度的研究,对于隧道、桥梁、排污口等涉水工程具有重要的意义。本论文以钱江通道河段为例,构建了钱江通道河段整体物理模型,研究了自然情况下的河床极限冲刷,经定床水流、动床地形验证,模型可靠性较高,同时运用水槽模型探讨了丁坝等局部工程在洪、潮水作用下对河床冲刷的叠加影响,进而预测了钱江通道最终的河床设计高程。运用水槽断面模型试验方法,模拟了钱江通道河段自然条件下的河床极限冲刷,研究了极限冲刷下河床的冲刷机理与过程,并就影响极限冲刷的水深、流速等主要因子进行了分析,建立了基于量纲分析及多元回归法的河床极限冲刷计算公式。
[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.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV149

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