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复式断面明渠水流特性研究(陈长英)

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【作者】陈长英 【导师】张幸农水利论文1G gq+foAd.G
【作者基本信息】南京水利科学研究院,水利学及河流动力学,2002年,硕士水利论文'w7s`}/ez/wZ-jK{

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【中文摘要】 目前我国许多河流尚缺乏完善的治理,河道行洪能力较低,洪水灾害频繁,由此而造成的国民经济损失极为巨大。因而防洪减灾是我国一项长期而又艰巨的任务。一般情况下,我国大多数天然河流都具有滩槽分明的复式断面河床,枯水期主要为主槽泄流,洪水期水流漫滩以后形成复式河槽流动,受滩槽水流相互掺混的影响作用,主槽过水能力降低。且滩地糙率大,流速相对较小,从而使得全断面流速较小,洪水传播时间较长,洪水位上涨。因此,复式河槽水流特性及各项水力参数对河道行洪能力的影响尤为重要,该问题已引起国内外水力学界的高度重视,同时也是目前我国大江大河治理工程实践中急需解决的课题。 本文采用水槽试验与数值模拟计算两者相结合的研究方法,对复式断面水流特性进行了研究。通过回顾已有的研究工作,明确了研究的方向和目标。根据建立的二维水流数学模型,进行了复式断面横向流速分布的模拟计算,以水槽试验资料予以验证。并且针对复式断面横向流速分布,边界剪切应力分布和变化规律,水流流量、滩槽宽度比例、滩地糙率等因素对断面过流能力的影响,以及滩槽流量分配计算等等问题进行了探讨研究。通过对各影响因素进行分析与比较,提出了自己观点。研究成果对于河道整治...更多工程和防洪规划工程确定断面形态参数、优化断面设计具有参考价值。  还原水利论文6O#bO-J`$?

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【英文摘要】 At present, many rivers in our country are still short of perfect regulation. The discharge capacity of rivers is lower. Multifarious flood disaster caused national economy extremely big loses. Therefore, flood control and reducing the disaster is a long-term and arduous assignment in our country. Generally, many natural rivers have compound channels, possessing a main channel, and one or two floodplains. The main channel carries water in low-water season. There is compound channel above bankfull stages in flood season. Because of the overbank flow, the discharge capacity of the main channel decreased. In other way, the current velocity of the floodplain is lower due to the rough floodplain. So, the velocity of the whole section is lower, and the travel time of flood wave is longer, and water lever increased. Therefore, it is important to know the flow characteristics in compound channels and the effect of hydraulic parameter on the channel's discharge capacity. This problem has been p...更多aid high attention in hydraulics and in home and abroad. On the other hand, it is urgent to resolve this problem for regulating river in practice.Flume experiment and numerical simulation were adopted to study the flow characteristics of compound section. Through reviewprevious work, the aim of the project was defined. Two-dimensional flow mathematical model was built to calculate the lateral distribution of the flow velocity in compound section, and the result of calculation was proved by flume experiment. Then, the lateral distribution of velocity and the lateral distribution of boundary shear stress were studied. Some factors, such as flow discharge and the ratio of the floodplain width to the main channel width, the flood plain roughness etc effect on discharge capacity were discussed in detail. The discharge assessment in compound channel was also discussed. Through analyzing and comparing influencing factors, some standpoints were presented in the paper. The research result can be a good reference to verifying section parameters and optimizing section design in river regulation and flood control projects.  还原

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qVQu&~%gc0【中文关键词】 复式断面; 水流特性; 水槽试验; 数值计算水利论文RUPS(olH
【英文关键词】 compound channel; flow characteristics; flume experiment; numerical calculation
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TAG: 断面 水流 特性 明渠 陈长英
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