Carling, P.A., Cao, Z. and Ervine, D.A.
Flood plain contribution to open channel flow structure
Dyer, F.J., Thoms, M.C. and Olley, J.M. (eds.)
The structure, function and management implications of fluvial sedimentary systems.
Alice Springs, Australia,
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Enhanced understanding of the role of flood plains in dictating open-channel flow is essential for environmental and ecological management of fluvial systems. This paper presents the field measurements and primary analysis of flood flow across a compound channel in the River Severn, England. A three-dimensional acoustic Doppler velocimeter in combination with a directional current meter is deployed to measure the velocity. The statistical flow structure is compared with existing analytical formulations derived for single channel flows. The existence of a vertically double-layer structure around the interface between the main channel and the flood plain is demonstrated, indicating (a) a vertical shear-dominated flow zone near the bed; and (b) away from the bed a transverse shear-dominated flow zone with enhanced turbulent mixing. This feature necessitates concurrent consideration of both the transverse and the vertical resolution in mathematical modelling. The measured data can be utilized to assess the performance of mathematical river models.
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