Laboratory Tests On Flow Field
Around Bottom Vane
Author(s)
M. M. Hossain, Md. Zahidu Islam, Md. Shahidullah,
A. de Weerd, P. van Wielink & E. Mosselman
Abstract
Bottom vanes are vortex generating devices that are mounted on the river bed at
an angle to the prevailing flow direction. They can be used effectively for
sediment management and training of alluvial rivers. We tested the
three-dimensional flow field generated by bottom vanes in a 45.6 m long and
2.45 m wide straight flume at the open-air physical modelling facility of BUET
in Dhaka, Bangladesh, for all combinations of 4 vane heights, 5 vane angles and
2 bed topographies. Both topographies were moulded in concrete. The two bed
topographies consisted of a flat bed and a bed with scour holes recorded in
preceding mobile-bed experiments. Vanes at an angle of 30° to the flow were
found to generate the strongest vortices. The scour holes did not weaken the
vortices appreciably. We conclude therefore that local scour does not jeopardize
the effectiveness of bottom vanes.
Keywords: helical flow, vortex, bottom vanes, laboratory experiments.
1 Introduction
Bottom vanes are vortex generating devices that are mounted on the river bed at
an angle to the prevailing flow direction. The pressure difference between the
pressure and suction sides of the vanes produces vortices that alter the transverse
slope of the alluvial river bed in a zone downstream of the vanes. Thus bottom
Keywords
helical flow, vortex, bottom vanes, laboratory experiments.
Related Book
Other papers in this volume
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