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河口航道整治工程水动力及河床变形响应数值模拟研究【作者】鞠俊 【导师】夏云峰

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yx)i,QU m:p#V9r1KB0河口航道整治工程水动力及河床变形响应数值模拟研究

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"I1lX+{rA0【作者】鞠俊 【导师】夏云峰
];Y4Q~1P*Y0【作者基本信息】南京水利科学研究院,港口、海岸及近海工程,2008年,硕士

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【中文摘要】 航道整治是借工程建筑规顺河岸、调整水流、达到要求的航道水深,使用最为广泛的包括(非淹没)丁坝、潜坝和挖槽等方式。但整治工程往往改变局部水流结构,形成较为复杂的水流流态,导致局部泥沙冲淤并引发新的冲淤发展、调整。但航道整治工程水动力响应及其对河床变形影响的研究较为分散,尚未形成较为系统、深刻的研究。因此,进行这方面的研究具有重大的现实意义。本文总结了数学模型的发展与研究现状,在前人研究基础上,建立三维数学模型,研究航道整治工程的水动力响应。通过对航道整治典型工程丁坝、潜坝、挖槽等进行模拟研究,分析航道工程引起的局部水位及流态、流速在三维空间上的变化特征。选择双方程紊流模型耦合二维水流和泥沙模型,讨论模型的紊流闭合、泥沙的沉降与起动、不平衡输沙模式下挟沙力级配等问题。运用数学模型模拟丁坝建设后河床变形特性及冲淤发展变化。同时还模拟了航槽开挖后推移质的运动,通过典型水流条件,分析航槽推移质淤积断面的形态以及变化规律,同时利用全沙模型模拟分析了水流垂直于航槽走向情况下的航槽冲淤变化。将泥沙模型应用于长江福姜沙水道双涧沙整治工程中,讨论模型中相关技术的处理,包括挟沙力分级、挟沙力公式的选取等。利...更多用实测夏季大潮水流条件分析工程实施对工程区域流态、流速、水位的变化,并根据一个水文年资料计算分析工程建设后河床的冲淤变化。  还原

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【英文摘要】 Waterway Regulation is to regulate riverbank and adjust flow in order to reach depth of channel by engineering. Spur dike, submerged dike and dredged channel are most extensive. They bring changes of local flow structure. The complex flow result in the local scouring and silting and bring new evolution. The computational study on the hydrodynamic and bed morphologic response of waterway regulation engineering at estuarine is sporadic. So, the study on it has great realistic meaning.Based on the present research, this thesis summarize development and research status of mathematical models. A 3-d mathematical model is established in order to study the hydrodynamic response of waterway regulation engineering. The local water level change, flow pattern and velocity variation in the space domain are analyzed by the mathematical simulations of the engineering of Spur dike, submerged breakwater and dredged channel.Double-equation turbulence model is chosen in flow and sediment mathematical mo...更多del, the Problems of turbulence closure, sediment settlement and incipient motion, gradation of sediment carrying capacity are discussed. The river bed deformation after the constructed the Spur dike and the development of bed morphology are simulated. The bedload transport motion after dredged channel is simulated. The fracture morphology and change law of the bedload transport motion in dredged channel are analyzed. Meanwhile, the morphology under the condition of flow direction paralleled to the dredged channel is simulated by a total sediment transport model.The model is applied to the Shuang-Jian-Sha regulation project on Fu-Jiang-Sha channel in Yangtze River. The related problems of gradation and formula of sediment carrying capacity are discussed. The local water level change, flow pattern and velocity variation after the constructed are analyzed at spring tide in summer, then the change of scouring and silting is calculated and analyzed in a hydrological year.  还原

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【中文关键词】 航道整治; 数学模型; 水动力响应; 床面冲淤
2KX }JFkCvDJ0【英文关键词】 waterway regulation; mathematic model; hydrodynamic response; bed morphology水利论文6BM]O,FzO1a

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TAG: 航道整治 河床 河口 鞠俊 夏云峰
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