Abstract:
The common configuration of rivers is a main channel flanked by floodplains.
During flood events, the main channel is not enough to discharge
the flow and the floodplains are submerged. The momentum transfer due
to the difference of the velocities between the sub-sections generates a
complex 3D flow structure. For the study of the influence of this structure
in flow modeling, measurements of the velocities in a prismatic compound
channel have been made. Seven 1D methods to compute the sub-section
and total discharges were applied. Comparisons between experimental data
and modeling reveal good agreement when simple models that indirectly
take into account the momentum transfer are applied.
