| 摘要: |
| 倒顺坝是山区河流航道整治中较为常用的一种建筑物，其坝头绕流特性对航道通航水流条件影响明显。应用平面二维水流数学模型研究了倒顺坝坝头绕流特性，获得了绕流区长度、宽度及转点合流速随倒顺坝几何参数及来流条件的变化规律，建立了相应的计算式，并将其应用于长江猪儿碛浅滩航道整治方案设计中。为此，探讨了猪儿碛浅滩的碍航特性和滩险成因，提出了整治方案。对方案整治效果的分析表明，方案实施后航道尺度满足设计要求，流速增值及消滩判数均符合设计预期目标，航槽内流态较好，无回流、斜流和横流等碍航流态，说明本文建立的倒顺坝绕流特性参数计算式可为航道整治方案设计提供较好的技术支撑。 |
| 关键词: 倒顺坝 绕流特性 浅滩 航道整治 数值模拟 |
| DOI： |
| 分类号:U61 |
| 基金项目:重庆市科委自然科学基金计划资助项目(cstc2012jjA00020)；重庆市教育委员会科学技术研究项目(KJ120403) |
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| Circumfluence characteristics of reversing longitudinal dike head and its application to waterway regulation |
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ZHONG Liang1, XU Guang-xiang2, HE Yan-jun3
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1.National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University;2.Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University;3.hangjiang Chongqing Harbour and Waterway Engineering Investigation and Design Institute
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| Abstract: |
| The reversing longitudinal dike is widely applied to the mountainous waterway regulation works, and the circumfluence characteristics near the reversing longitudinal dike head have great influence on navigation flow conditions. In this paper, the circumfluence characteristics near the reversing longitudinal dike head are discussed with the adoption of a 2-D flow mathematical model； the circumfluence parameters, such as the length and width of circumfluence area and the flow velocity at the turning point, are obtained; and the relationships between the circumfluence parameters, the geometry parameters of the reversing longitudinal dike and the inlet flow conditions are established including the corresponding calculation formulas. The calculated results are applied to the regulation scheme design for the Zhuerqi shallow shoal in the Yangtze River. The navigation hindering characteristics and the formation causes of the Zhuerqi shallow shoal are discussed, and the regulation schemes are proposed. Analysis of the simulated regulation schemes shows that after implementation of the regulation works, the channel scales meet the design requirements, the increasing in flow velocity and hydraulic index are in line with the expected design targets, the flow pattern in the channel is good, and there are no navigation hindering flow such as the backflow, oblique flow and cross flow, which indicates that the calculation formulas for the circumfluence characteristic parameters developed in this paper can provide an effective technical support for the regulation scheme design in the future. |
| Key words: reversing longitudinal dike circumfluence characteristics shallow shoal waterway regulation numerical simulation |
