Bousmar, Didier
[UCL]
Jacqmin, Thomas
[UCL]
Wyseur, Sébastien
[UCL]
Van Emelen, Sylvie
[UCL]
This paper presents an experimental investigation of the flow in a skewed compound channel with rough floodplains. In the investigated geometry, the main channel is prismatic; the left floodplain width reduces from 400 to 0mm on a 6m length; while the right floodplain enlarges from 0 to 400mm on the same distance. Contrarily to previous investigation on non-prismatic geometries found in literature, where both main channel and floodplains always had smooth bed boundaries, the floodplains have a roughness value twice the main channel one. The measurements show that the left floodplain width reduction forces slow water flow to enter into the main channel, shifting the maximum velocity filament to the right; while main channel fast water flows into the right floodplain. Comparison with smooth boundaries skewed channel measurements shows that the increased floodplain flow resistance in the rough bed case reduces the velocity diffusion on the receiving floodplain, at least at low relative flow depth. Lastly, the Independent Subsection Method (ISM) is applied to both smooth and skewed channel cases, and proves to estimate satisfactorily the flow resistance and the discharge distribution evolution along the channel.
Bibliographic reference |
Bousmar, Didier ; Jacqmin, Thomas ; Wyseur, Sébastien ; Van Emelen, Sylvie. Flow in skewed compound channels with rough floodplains.International Conference on Fluvial Hydraulics, River Flow 2012 (San José, Costa Rica, du 05/09/2012 au 07/09/2012). In: River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics, R. E. Murillo Munoz2012, p. 217-224 (Vol. 1) |
Permanent URL |
http://hdl.handle.net/2078/117752 |