Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of vegetation patches on flow structures and the estimation of friction factor
In rivers, irrigation canals, and drainage channels vegetation patches often appear over the bed. Flow over vegetation patches is in non-developed region which significantly influences the flow structures, thus affecting the estimation of friction factor. In the present study, the experiments were conducted in a laboratory flume to investigate the interaction of vegetation patches with turbulent flow structures evolving area over small patches. Different roughness coefficients were applied in the presence of vegetation patches, and velocity distributions, Reynolds stress distributions, and Turbulent Kinetic Energy (TKE) distributions were analyzed because they play an important role in the estimation of friction factor. Results showed that Reynolds stress and TKE at the trailing edge of vegetation patches increased due to the vertical circulation downstream of each patch. However, the vertical circulation, Reynolds stress, and TKE decreased in the flow over three patches in comparison to the flow over two patches. Results also indicated that the geometric features of a vegetation patch played an important role in the friction factor in open channels with vegetation patches on the bed.
Effect of vegetation patches on flow structures and the estimation of friction factor
In rivers, irrigation canals, and drainage channels vegetation patches often appear over the bed. Flow over vegetation patches is in non-developed region which significantly influences the flow structures, thus affecting the estimation of friction factor. In the present study, the experiments were conducted in a laboratory flume to investigate the interaction of vegetation patches with turbulent flow structures evolving area over small patches. Different roughness coefficients were applied in the presence of vegetation patches, and velocity distributions, Reynolds stress distributions, and Turbulent Kinetic Energy (TKE) distributions were analyzed because they play an important role in the estimation of friction factor. Results showed that Reynolds stress and TKE at the trailing edge of vegetation patches increased due to the vertical circulation downstream of each patch. However, the vertical circulation, Reynolds stress, and TKE decreased in the flow over three patches in comparison to the flow over two patches. Results also indicated that the geometric features of a vegetation patch played an important role in the friction factor in open channels with vegetation patches on the bed.
Effect of vegetation patches on flow structures and the estimation of friction factor
Afzalimehr, Hossein (Autor:in) / Riazi, Parvin (Autor:in) / Jahadi, Mahsa (Autor:in) / Singh, Vijay P. (Autor:in)
ISH Journal of Hydraulic Engineering ; 27 ; 390-400
02.11.2021
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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