The Hydraulics of Flow in Non-Prismatic Compound Channels

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The Hydraulics of Flow in Non-Prismatic Compound Channels

Original Article, C51
Yonesi H.A., Omid M.H and Ayyoubzadeh S.A
Journal. Civil Eng. Urban. 3(6):342-356. 2013

ABSTRACT:This paper investigates the effects of floodplains' roughness the on hydraulic overbank flow in compound channels with non-prismatic floodplains. Experiments are carried out using three divergence angles and three roughness sizes on the floodplain. The velocity was measured using a three dimensional acoustic Doppler velocimeter and directional current meter in a lattice along the divergence channel with different depth ratios. Velocity distributions on the half-width of the channels in three portion of the flume (entrance, middle and end of the divergence) were measured. Using the experimental data about the values of the shear stress, depth–averaged velocity, roughness coefficient, turbulence parameters and divided discharge between the main channel and floodplain, the water surface slope was evaluated. Also these results were compared with the prismatic compound channel and also compared using the Shiono-Knight method.
Keywords:Diverging compound channel, Roughness ratio, Angle of divergence

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