期刊
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
卷 46, 期 2, 页码 1375-1392出版社
SPRINGER INT PUBL AG
DOI: 10.1007/s40996-021-00630-x
关键词
Bed shear stress; Drag coefficient; Gravel bed channels; Vegetation; Open channel flow; Emergent vegetation
This study experimentally investigates the distributions of velocity in 3D in gravel bed channels with vegetation and examines six different methods for estimating bed shear stress. The distribution of shear stress is mainly controlled by the spatial distribution of vegetation and the biomechanical and architectural features of these plants, leading to a layered shape of shear stress near the bottom of the flume.
Vegetation in open channels alters turbulent and other hydraulic characteristics of flow. Hence, conventional methods for computing bed shear stress in bare channels are not applicable in such channels. The present study, therefore, experimentally investigates the distributions of velocity in 3D in gravel bed channels with vegetation and investigates six different methods for estimating bed shear stress. The distribution of shear stress is basically controlled by the spatial distribution of vegetation as well as the biomechanical and architectural features of these plants. It is found that near the bottom of the flume, the shear stress changes in dense layers, constituting a layered shape.
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