Effect of vegetation on boundary layer with turbulent free stream

摘要

Effects of vegetation on flow hydraulic characteristics as flow resistance, conveyance capacity, turbulence characteristics, represent a very studied research topic, mostly in relation to uniform flow condition. In this paper effect of vegetation on velocity distributions in a boundary layer are experimentally investigated. Vegetation is modelled through regular array of vertical brass cylinders of two different heights. Local mean velocity distributions were detected through an LDA system. The presence of vegetation produces an evident change in velocities profiles and a meaningful increase of boundary layer thickness. But in any case the equilibrium boundary layer characteristics are preserved with vegetation too.