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干支流交汇河段水流特性计算研究【作者】陈月华 【导师】李国斌

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5\&oz2~k0支流交汇河段水流特性计算研究

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【作者】陈月华 【导师】李国斌
(w YXSe-`0【作者基本信息】南京水利科学研究院,水力学及河流动力学,2007年,硕士

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【中文摘要】 天然河流中存在着大量的干、支流交汇的河段,在干支流相汇处,由于干、支流两股水流相互顶托,交汇区内水流紊动掺混作用强烈,能量损失很大,干、支河流原有的水沙平衡状态被打破,可能导致泥沙颗粒、尤其是粗颗粒卵石在汇合口处大量淤积,形成河口浅滩或江心滩(洲)。因此,在干支流以及汇合口流段,无论是水流现象、泥沙特征、河床形态都具有复杂多变的特点。由于一般交汇河段具有复杂的水流条件和地形条件,限制了航运事业的发展,受到交通部门的关注。因此,研究交汇河段的水流水力特性具有很大的现实意义。本文在前人研究成果的基础上,综合分析了干支流交汇河段的水动力特性,如天然干支流河道的交汇形式、平面形态、交汇区水流特性、水面形态特征以及交汇河段泥沙运动规律和河床演变规律。由于二维正交贴体曲线网格很好地解决了直角坐标系中矩形网格难以与天然河道边界贴合的困难并给数值模型带来了极大的方便,因此本文在生成干支流交汇河段二维贴体正交曲线网格的基础上,采用有限体积法离散正交贴体曲线坐标系下平面二维水深平均水流运动方程组,利用Panaker和Spalding提出的SIMPLER程式求解耦合方程,建立了二维水流数学模型,并将模型应用...更多于长江上游重庆段长江与嘉陵江交汇河段和太子矶水道的水流计算中,计算值与实测值较为一致。在网格生成时,本文对边界正交的处理方法在前人研究的基础上进行了改进,并取得了较好的计算效果。本文还对干支流交汇河段水流数学模型中的一些相关问题的处理,如河道阻力、紊动特性的影响进行了分析讨论,并根据计算资料进行论证。  还原水利论文*kY.[ h+}1N rw}

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【英文摘要】 The confluences of main stream and tributary stream are common in natural rivers. At the confluence zone, due to the jacking of current from main stream and tributary stream, the mixing and turbulence of current is so strong and the loss of energy is so large that the balance of water and sediment is broken which could causes sediment particle and coarse grain to deposit and forms shallow shoal at river mouth or eyot. The current state, sediment characteristic and stream bed feature are complex and changeful at main stream and tributary stream and the confluence zone. The complex of flow and topographical condition in the confluence limits the development of navigation which is paid attention by communication department. Therefore, the research on flow characteristic in the confluence of main stream and tributary stream has practical meaning.Based on the present research, this thesis analyzes the hydrodynamics characteristics in the confluence of main stream and tributary stream such a...更多s confluence pattern, flat feature, flow characteristics in the confluence zone, water surface feature, sediment movement law and evolution of river bed. Because the boundary of natural river is very difficult to be fitted in Descartes coordinate, the orthogonal body-fitted coordinate is applied in numerical model. Based on the orthogonal body-fitted grid of confluence reach of main stream and tributary stream generation, a 2-D flow mathematical model is developed by using finite volume method and SIMPLER modality to solve coupled equation which put forword by Partaker and Spalding in this thesis. The model is applied to the flow calculation of the confluence of Yangtse River and Jialing River which in the upstream of Chongqing reach and channel of Taiziji and the calculation value accords well with measured value. Moreover, this thesis also discussed some relevant problems about the confluence of main stream and tributary stream mathematical model such as the roughness in the river, the influence of turbulence characteristic.  还原水利论文j+Br-R"P&y]SOi

3_ Oqr2J&}g0【中文关键词】 干支流交汇; 二维水流数学模型; 有限体积法; 网格生成; 紊动粘滞系数水利论文Z^.L aJz9i'[
【英文关键词】 confluence of main stream and tributary stream; 2-D flow mathematical model; finite volume method; grid generation; turbulence viscosity coefficient水利论文"^ h!?5A/e~(?
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TAG: 河段 李国斌 特性 陈月华 支流
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