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Turbulent flow across a natural compound channel

Record type: Article

The measurements and primary analysis of turbulent flow across a compound channel (River Severn, England) are presented. The velocity was measured using a three-dimensional acoustic Doppler velocimeter in combination with a directional current meter. The statistical flow structure is examined against existing analytical formulations derived for single channel flows based on laboratory studies. The existence of a vertically two-layer structure around the interface between the main channel and the floodplain is demonstrated, indicating (1) a vertical shear-dominated flow zone near the bed; and (2) away from the bed a transverse shear-dominated flow zone with enhanced turbulent mixing. The temporal spectra clearly reveal the occurrence of anisotropic turbulence both in the main channel and over the floodplain. The present findings necessitate the resolution of both transverse and vertical structures for advanced modeling of compound channel flows. The measured data can be used to assess the performance of mathematical river models.

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Citation

Carling, P.A., Cao, Z., Holland, M.J., Ervine, D.A. and Babaeyan-Koopaei, K. (2002) Turbulent flow across a natural compound channel Water Resources Research, 38, (12), pp. 6-11. (doi:10.1029/2001WR000902).

More information

Published date: December 2002
Additional Information: Turbulent exchange of fluid between river and floodplain prior has been measured in hydraulic flumes. This was one of several papers by this group which provide the first report of the process from field experiments. The results aid understanding and modeling of floodwave propagation during flooding conditions. NERC funded research.
Keywords: oceanography, physical, turbulence diffusion and mixing processes, hydrology, floods, runoff and streamflow, history of geophysics, instruments and techniques

Identifiers

Local EPrints ID: 15221
URI: http://eprints.soton.ac.uk/id/eprint/15221
ISSN: 0043-1397
PURE UUID: 18fb8685-c5ad-4abe-ba89-311220bba4f7

Catalogue record

Date deposited: 12 Apr 2005
Last modified: 17 Jul 2017 16:50

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Contributors

Author: P.A. Carling
Author: Z. Cao
Author: M.J. Holland
Author: D.A. Ervine
Author: K. Babaeyan-Koopaei

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