STABILITY OF ORGANIZED HORIZONTAL VORTICES AND MOMENTUM TRANSPORT IN OPEN CHANNEL FLOWS WITH BANK VEGETATION

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  • Ikeda Syunsuke
    社団法人 土木学会 東京工業大学 工学部土木工学科
  • Kuga Takeshi
    社団法人 土木学会 北海道開発庁
  • Chen Fei-Yong
    社団法人 土木学会 東京工業大学大学院 理工学研究科土木工学専攻

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  • 両岸に植生帯を有する開水路流れに発生する大規模水平渦の安定性と運動量輸送
  • リョウギシ ニ ショクセイタイ オ ユウスル カイスイロ ナガレ ニ ハッセイ

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Abstract

A series of laboratory tests was performed on the stability of organized horizontal vortices generated along the boundaries of bank vegetation, and the associated exchange of fluid momentum at the boundary of bank vegetation was measured by using a laser-Doppler velocimetry. The wavelength of the vortices is explained well by a linear stability analysis, suggesting that the vortices are generated by shear instability. At some value of width of main flow region without vegetation, the momentum exchange takes a peak value, where two vortex streets show a stable staggered array. A numerical computation employing SDS & 2DH turbulence model originally proposed by Nadaoka and Yagi was performed to calculate the 2D flow field, supporting the measurements.

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