Structure of Flood Flow in the Tone River With Vegetation Clusters Along Low-Water Channel Bank

1 フェロー会員工博東京工業大学教授大学院総合理工学研究科環境理工学創造専攻（〒226-8502 神奈川県横浜市緑区長津田町4259） 2 学生会員修(工) 東京工業大学大学院総合理工学研究科環境理工学創造専攻（〒226-8502 神奈川県横浜市緑区長津田町4259）Horizontal large eddies caused by the instability of shear layer between main channel and flood plain were investigated for two rivers by aerial photo analysis and numerical flow simulation. One river (A) has flood plains on both sides of main channel, and the other (B) has one flood plain with a comparatively narrow main channel. Transverse velocity at the edge of flood plains caused by eddies were obtained from aerial photo analysis, and eddy lengths were determined by zero-up cross of the velocity. A flow model of quasi-3D was applied to the large eddy computation under the actual flow conditions. Scale and intensity of eddies obtained from the computation agreed very well with the results from aerial photo analysis. In addition, the both results suggested that rows of eddies in river-A were less stable with frequent merging and splitting than in river-B. A series of numerical experiments showed that the eddy stability is controlled by the ratio of the transverse scale of eddies to the width of main channel.

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Structure of Flood Flow in the Tone River With Vegetation Clusters Along Low-Water Channel Bank

Cited by 3 publications

References 4 publications

Organized Horizontal Vortices and Lateral Sediment Transport in Compound Open Channel Flows

Organized Horizontal Vortices and Lateral Sediment Transport in Compound Open Channel Flows

Application of a Quasi-3d Numerical Model to a Flood Flow Observed in the Lower Tone River in September, 1998

Comparison of Characteristics of Horizontal Eddies in Different River Channel by Aerial Photographs

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