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Effect of Floodplain Obstructions on the Discharge Conveyance Capacity of Compound Channels

Mulahasan, S; Stoesser, T; McSherry, R; (2017) Effect of Floodplain Obstructions on the Discharge Conveyance Capacity of Compound Channels. Journal of Irrigation and Drainage Engineering , 143 (11) 10.1061/(ASCE)IR.1943-4774.0001240. Green open access

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Abstract

: Results of an experimental study into steady uniform flows in compound open channels with cylindrical obstructions designed to mimic emergent vegetation is presented. Two configurations—fully covered floodplain and one-line obstructions—are considered, and the hydraulic properties are compared to those of a smooth, unobstructed compound channel. Particular attention is given to the effect of obstruction (i.e., vegetation) density on the rating curve, drag coefficients, and spanwise profiles of streamwise velocity. Flow resistance is estimated using an established approach, and the results are in agreement with other experimental studies. It was shown that the obstruction configuration significantly influences the flow velocity in the main channel, and in the case of one-line obstructions the floodplain velocity is higher than for an unobstructed channel for a given flow rate. Spanwise velocity profiles exhibit markedly different characters in the one-line and fully covered configurations.

Type: Article
Title: Effect of Floodplain Obstructions on the Discharge Conveyance Capacity of Compound Channels
Open access status: An open access version is available from UCL Discovery
DOI: 10.1061/(ASCE)IR.1943-4774.0001240
Publisher version: http://dx.doi.org/10.1061/(ASCE)IR.1943-4774.00012...
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Agricultural Engineering, Engineering, Civil, Water Resources, Agriculture, Engineering, Compound channel, Vegetation, Drag, Rating curve, Spanwise velocity profile, DEPTH-AVERAGED VELOCITY, EMERGENT VEGETATION, COHERENT STRUCTURES, FLOW STRUCTURE, SHEAR-STRESS, DRAG, LAYER
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10057995
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