ABSTRACT
This study experimentally investigated the influence of the spatial layout of vegetation patches on the river hydro-morphodynamics and flow resistance. A unique large-scale outdoor experimental channel with artificial willows has been formed in the Korea Institute of Civil Engineering and Building Technology – River Experiment Center (KICT-REC). The primary data set is the flow velocity within a vegetation patch measured by a Nortek Acoustic Dopper Velocimeter (ADV), and the bed level changes recorded by 3D terrestrial laser scanning and manual survey before and after the experiment. The flow resistance evaluated through Manning’s roughness coefficient was determined and compared for different vegetation layouts and densities. The experimental results suggest that flow characteristics in vegetation layouts strongly depend on the vertical structure and the density of the vegetation patch. Moreover, the relation between the flow resistance, the vegetation density, and the blockage area was investigated.
