Author(s): A. Tominaga; M. Nagao; And I. Nezu
Linked Author(s): Akihiro Tominaga
Keywords: Curved flow; Secondary flow; Flow structure; Vegetation; 2-D simulation
Abstract: Vegetation and porous spur dikes are considered to affect the flow structures in curved open channels. In this study, three-dimensional mean flow structures were measured in curved open channels with various vegetation arrangements. The secondary flow is generated only in the region outside the vegetation zones and the lateral scale of the vortex structures in bends are reduced. The main flow indicates complicated behaviors affected by the strong lateral shear, the centrifugal force, the pressure gradient and the momentum transport by the secondary flow. These mean flow structures and momentum transport processes are simulated by a 2-D numerical calculation including the dispersion term of the secondary flow.
Year: 1999