1 正会員 博士(工学)徳山工業高等専門学校土木建築工学科(〒745-8080山口県周南市学園台) 2 学生会員 徳山工業高等専門学校専攻科 環境建設工学専攻(同上) Characteristics of turbulent structure of open channel flow with flexible vegetation model on the bottom wall were investigated using velocity measurements and flow visualization techniques. The velocity measurements indicate that vertical and horizontal mean primary velocity shears (∂U/∂y, ∂U/∂z) and maximums of turbulence intensity and vertical Reynolds shear stress are formed in the vicinity of the top of the

more »

... flexible vegetation model. The results of flow visualization indicate that large scale streamwise vortex is formed over the vegetation model and a pair of vortex structure having vertical axis is formed behind of the vegetation model. The results of DPTV, which is combined dye injection method and Particle Tracking Velocimetry, show that the streamwise vortex contributes generating instantaneous Reynolds stress directly.