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黄河下游洪水模型相似律的研究【作者】张红武 【导师】夏震寰; 王桂仙

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【作者】张红武导师夏震寰; 王桂仙
2GE2[0p(J(J J*DL0【作者基本信息】清华大学,水力学及河流动力学,1995年,博士

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【中文摘要】 本文首先回顾了前人在河流悬移质泥沙模型相似律方面取得的大量研究成果。根据黄河下游洪水实际情况,指出了本文研究的性质和范围。为使黄河下游洪水物理模型相似律建立在可靠的基础上,本文从探索挟沙水流的基本运动规律入手,针对水流挟沙力、流速和合沙量沿水深分布以及悬移质运动方程等,进行了专门研究。所得计算水流挟沙力、流速及含沙量沿水深分布的公式与实际资料相符合,且对于一般挟沙水流和高含沙紊流都适用。此外,还专门对河床的综合稳定性指标开展了研究。在上述工作的基础上,提出了黄河下游洪水动床河工模型的相似条件及设计方法。其主要之处为:(1)确定了高含沙水流处于充分紊流状态的界限有效雷诺数为8000;(2)在悬移相似条件中引进了平衡含沙量分布系数比尺,解决了黄河动床变态模型如何确定悬移质沉速比尺的问题;(3)引进河型相似条件,为自然模型与比尺模型的统一打下了良好基础;(4)对于合沙量比尺及河床变形时间比尺的论述及其确定方法,也具有重要的价值。 先后完成的黄河花园口至东坝头河段1988年中水丰沙型洪水及“92.8”高含沙洪水验证试验结果表明,采用本文提出的模型相似律进行模型设计,模型水流运动、泥沙运动及河床...更多演变规律,均与原型相似。  还原水利论文8Y8G/l4wD$g

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【英文摘要】 This thesis reviewed at first the existing research results of the law of similarity for river models carrying sediment. In order that the similarity criteria established be based on sound foundation, fundamental properties of flow with heavy sediment load, such as the vertical distributions of velocity and suspended sediment and the sediment carrying capacity of the flow, were studied. The proposed equations describing these properties have been checked upon satisfactorily with large amount of flume or field data. Besides, a stability criterion for different river regimes has been suggested. A set of similarity law for flood flows of the lower reach of the Yellow River was then proposed.The salient points of our method of modelling the lower reach of the Yellow River are as follows:(1)The critical (i.e.,the lowest) effective Reynolds number for flows with heavy sediment concentrations to remain turbulent without the effect of Bingham limiting shearing stress TB is 8000.(2)By introduci...更多ng a new factor a. , called the distribution factor of saturated sediment concentration , we are able to determine more appropriately the scale of the fall velocities of the suspended sediment between the prototype and the model.(3)A new criterion for river regime is introduced in order that the river regime in the model be the same as in the prototype.(4)The discussions and the method of determination for the scale of sediment concentration and the time scale of river channel deformation are also worthy of note.The proposed model law has been used in a model of the lower reach of the Yellow River from Huayuankou to Dongbatou. The test results of this model for the floods of 1988 and 1992 show that the flow pattern, the sediment movement and the channel deformation all conform very well with the field data of these floods.  还原水利论文 HF@:CXR P`:mi0r

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【中文关键词】 洪水; 模型相似律; 黄河下游; 水流挟沙力水利论文 IB^X kI&{b
【英文关键词】 law of similarity; modelling; similarity criteria; river model; the Yellow River; suspended sediment

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TAG: 黄河 王桂仙 张红武 夏震寰 洪水模型
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下一篇:挑射水流对岩石河床的冲刷机理研究【作者】刘沛清 【导师】余常昭; 冬俊瑞
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