A Study on the Roughness Factor and the Stability of a Composite Channel.

复合通道的粗糙度因子和稳定性研究。

基本信息

  • 批准号:
    59550338
  • 负责人:
  • 金额:
    $ 1.09万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1984
  • 资助国家:
    日本
  • 起止时间:
    1984 至 1985
  • 项目状态:
    已结题

项目摘要

The roughness factor of a composite channel increses when there is a strong lateral mixing between the low water channel and the flood plain. Therefore, We carried out an experiment on the lateral momentum mixing in a shallow open channel where the primary shear is in vertical. The following three types of flow were examined. (1) A couple of flows parallel to each other with a velocity difference. (2) A wake behind a piar. (3) A boundary layer on the side bank. Results showed that the lateral mixing in a shallow open channel is similar to the mixing of free turbulent flow and that the lateral eddy viscosity is proportional to the product of a lateral velocity difference and a lateral shear layer thickness. A shallow water equation accompanied by the above expression of the eddy viscosity led to a method of estimating the roughness factor of a composite channel.The flow resistance of bushes which often glow between the low water channel and the flood plain was studied by a field observation and a flume experiment. It is noteworthy that the coupling of the motion of bushes and the lateral seiche makes an regular emition of voltexes and enlarges the resistance.A numerical calculation method was developed to estimate a secondary circulation intensity which influences a large effect on the stability of the low water channel bank. Experiments verified that this method is useful especially in a natural river channel which is often bending in ancomprecated manner.The above results are served for the planning and designing a composite channel.
当低水位河道与洪泛平原之间存在强烈的横向混合作用时,复合河道的粗糙度系数增大。因此,我们对初级剪切为垂直的浅明渠进行了横向动量混合实验。研究了以下三种类型的流。(1)一对彼此平行但有速度差的流。船后的尾迹。(3)河岸边界层。结果表明,浅层明渠的横向混合与自由湍流的混合相似,横向涡动粘度与横向速度差和横向剪切层厚度的乘积成正比。由浅水方程和上述涡动黏度表达式推导出一种估算复合通道粗糙度系数的方法。采用野外观测和水槽试验相结合的方法,对低水位河道与洪泛平原之间经常发光的灌木的流动阻力进行了研究。值得注意的是,灌木的运动与侧向旋流的耦合使涡旋有规律地发射,增大了阻力。提出了一种对低水位河道岸稳定性影响较大的二次循环强度的数值计算方法。试验结果表明,该方法特别适用于经常发生非计算弯曲的天然河道。上述结果可为复合通道的规划设计提供参考。

项目成果

期刊论文数量(8)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
石川忠晴,田中昌宏: 水理講演会論文集. 31. 329-333 (1987)
Tadaharu Ishikawa、Masahiro Tanaka:液压会议记录 31. 329-333 (1987)。
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    0
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Shinich YAMAZAKI, Tadaharu ISHIKAWA, Tokuji KANAMARU: "An Experimental Study on the Lateral Shear Field in an Open Channel." Proceedings of Annual Conference of the Japan Society of Civil Engineers.39-II. 473-474 (1984)
Shinich YAMAZAKI、Tadaharu ISHIKAWA、Tokuji KANAMARU:“明渠横向剪切场的实验研究”。
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    0
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Tadaharu ISHIKAWA, Masahiro TANAKA: "Studies on the Resistance Characteristics of the Bushes in the Open Channel Flow." Proceedings of Japanese Conference on Hydraulics.30. 329-333 (1987)
Tadaharu ISHIKAWA、Masahiro TANAKA:“明渠水流中灌木丛阻力特性的研究”。
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    0
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山崎真一,石川忠晴,金丸督司: 土木学会年次学術講演会概要集. 39-2. 473-474 (1984)
Shinichi Yamazaki、Tadaharu Ishikawa、Toji Kanemaru:日本土木工程师学会年度学术讲座摘要集 39-2 473-474(1984)。
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    0
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田中昌宏,石川忠晴,木村聡: 土木学会年次学術講演会講演概要集. 41-2. 295-296 (1986)
Masahiro Tanaka、Tadaharu Ishikawa、Satoshi Kimura:日本土木工程师学会年度学术会议摘要 41-2 295-296 (1986)。
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ISHIKAWA Tadaharu其他文献

ISHIKAWA Tadaharu的其他文献

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{{ truncateString('ISHIKAWA Tadaharu', 18)}}的其他基金

Transition of hydraulic and sedimentary conditions in a river estuary under seasonal flow variations
季节性流量变化下河口水力和沉积条件的转变
  • 批准号:
    20360217
  • 财政年份:
    2008
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Behavior of fine sediment and its effect on the formation of hypoxia in estuaries.
河口细泥沙行为及其对缺氧形成的影响.
  • 批准号:
    13450202
  • 财政年份:
    2001
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
A Field Study on Salinity Circulation in Lake Ogawara
小河原湖盐度循环的实地研究
  • 批准号:
    09450187
  • 财政年份:
    1997
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
A Basic Study on Environmental Study at Primary School by Introducing Public Works
介绍公共工程对小学环境学习的基础研究
  • 批准号:
    07650637
  • 财政年份:
    1995
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Development of small ADCP with a memory for off-line data processing
具有离线数据处理存储器的小型ADCP的开发
  • 批准号:
    06555146
  • 财政年份:
    1994
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)

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Horizontal shear flows and lateral mixing in estuaries and the coastal ocean: Sediment transport in the shoal-channel estuary
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  • 批准号:
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