弯曲河道立堵截流龙口水力特性分析

发布时间：2018-03-02 19:08

本文选题：弯曲河道　切入点：立堵截流　出处：《水利学报》2017年02期 　论文类型：期刊论文

【摘要】：弯曲河道中截流水流运动规律极为复杂,弯道边界形态和立堵截流布置方式的不同对截流难度均有很大的影响,对弯道中立堵截流龙口水力特性进行分析,有助于了解复杂的水流流态并选择合适的截流方案。本文考虑弯曲河道截流的主要影响因素,以施工水力学为基础,建立弯道截流龙口水流流态和堤头局部水力特性的计算模型,分析弯道相对河宽、弯道弯角和龙口位置对水深和流速变化的影响。分析结果表明弯道截流龙口流速变化有显著的时变差异和位变差异,并给出了龙口相对水深和堤头局部流速随弯道形态的变化关系。最后结合大渡河丹巴水电站河湾上截流的工程案例分析比较,验证了计算模型的可行性和分析结果的适用性,为河湾中截流方案及其截流施工布置型式的选择提供了理论依据。
[Abstract]:The law of flow movement in curved channel is very complicated. The boundary shape of bend and the arrangement of vertical closure have great influence on the difficulty of closure. The hydraulic characteristics of neutral closure of bend are analyzed. It is helpful to understand the complex flow patterns and to select suitable closure schemes. In this paper, the main influencing factors of river closure in curved river are considered and based on construction hydraulics. The calculation model of the water flow pattern and local hydraulic characteristics of the embankment head is established, and the relative river width of the bend is analyzed. The influence of bend angle and Longkou position on the variation of water depth and velocity is analyzed. The relationship between the relative water depth of Longkou and the local velocity of the embankment head with the shape of the bend is given. Finally, the feasibility of the calculation model and the applicability of the analysis results are verified by comparing the engineering cases of the river closure on the Dadu River Danba Hydropower Station. It provides a theoretical basis for the selection of river closure scheme and its construction layout.
【作者单位】：武汉大学水利水电学院;中国市政工程中南设计研究总院有限公司;中国电建集团华东勘测设计研究院有限公司;
【基金】：国家自然科学基金项目(51279137)
【分类号】：TV551.2;TV135.5

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