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Journal of Hydrodynamics 2001年第1期13卷 86-91页

作者： Wei Bing-qian, Kunihide Uchijima, Hiroshi Hayakawa Department of Civil Engineering, Kitami Institude of Technology, 165, Koen-cho, Kitami, Hokkaido 090-8507, Japan Dep. of Civil Eng. Kitami Institute of Technol. 165 Koen-cho Hokkaido 090-8507 Japan

WT5”BZ]In this study, by considering the scale ratio related to the specific gravity of the submerged bed material, and introducing a degree of distortion, n the similarity laws for a distorted river model with a movable bed were derived under the conditions that the values of dual dimensionless parameters in a regime-criterion diagram for the bars are the same in a model as they are in a prototype, and that a resistance law such as the Manning-Strickler-type formula is to be valid for a model and a prototype. The usefulness of the similarity laws derived in this study was verified by comparing the bed forms from the distroted model experiments with the bed forms from the 1/50-scale undistorted model experiments, which were performed by the Hokkaido Development Bureau (H. D. B.), Japan, to examine the tentative plan for the improvement of a low-flow channel in the Chubetsu River, which is a tributary of the Ishikari River. It is considered that the distorted model experiments to be valid with either sand or lightweight bed material. [WT5”HZ]

关键词： similarity law regime-criterion diagram distorted model lightweight bed material alternate bars

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EXPERIMENTAL STUDY ON THE RELATION OF BED MORPHOLOGY WITH SURFACE FLOW IN MEANDER CHANNELS

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International Journal of Sediment Research 2006年第1期21卷 1-12页

作者： Hajime MIWA Faculty of Agriculture Iwate University Japan Prof.

alternate bars have the property that they migrate downstream whenever floods occur. However, in meander channels whose bend angles are larger than a critical value, the migration of bars can be suppressed, and the positions of bank erosion and flood attack also will be steady. In this study, the bed morphology in flume channels with bends of various lengths and angles is investigated at various flow discharges, and the relation of bed morphology to surface flow is investigated in detail using fluid measuring software. An effort is made to obtain guidelines for the plane shape design of meander channels. Based on the experimental results of bed topography and measurement of surface flow direction and velocity distribution, from the viewpoint of bank erosion and the concentration and dispersion of flood flow the most suitable plane shape for meandering channels is suggested through which the migration of alternate bars is suppressed.

关键词： Meander channel alternate bars Particle Tracking Velocimetry (PTV) Particle Image Velocimetry (PIV)

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