Turbulent flow across a natural compound channel
Turbulent flow across a natural compound channel
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.
oceanography, physical, turbulence diffusion and mixing processes, hydrology, floods, runoff and streamflow, history of geophysics, instruments and techniques
6-11
Carling, P.A.
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Cao, Z.
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Holland, M.J.
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Ervine, D.A.
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Babaeyan-Koopaei, K.
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December 2002
Carling, P.A.
8d252dd9-3c88-4803-81cc-c2ec4c6fa687
Cao, Z.
c541462a-b279-4c97-910d-69a6726c57c6
Holland, M.J.
e0aeb3b1-d7ce-4700-800f-b3b79e35f2b4
Ervine, D.A.
e66c5fe0-b8f3-4ce4-93b4-96f2480d6e59
Babaeyan-Koopaei, K.
c4b489fb-ecbe-49ef-a725-34ad17e06cb0
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), .
(doi:10.1029/2001WR000902).
Abstract
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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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
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Date deposited: 12 Apr 2005
Last modified: 15 Mar 2024 05:36
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Contributors
Author:
Z. Cao
Author:
M.J. Holland
Author:
D.A. Ervine
Author:
K. Babaeyan-Koopaei
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