Design of hydraulically efficient power-law channels with freeboard
Design of hydraulically efficient power-law channels with freeboard
A power law-channel is a generalized form of the parabolic channel. The exponent of the governing equation is a variable that for certain maximum permissible side slopes can be determined by maximizing the cross-sectional area of flow (or minimizing the wetted perimeter). Using this exponent rather than the constant allows a hydraulically more efficient open channel section to be designed. In earlier work on power law channels freeboard was neglected to simplify the analysis. However as pointed out by several authors, a channel without freeboard is of academic interest only and not practical. All open channels are in practice designed and constructed with freeboard as a factor of safety. In this paper freeboard has been introduced as an additional parameter to be taken into account when designing a power law channel. The work from this paper is applied to an earlier example of a parabolic channel to demonstrate a practical design.
560-563
Anwar, Arif A.
e9a57bb7-5225-45e6-9a69-2396a6e4fd31
Clarke, Derek
9746f367-1df2-4e0e-8d71-5ecfc9ddd000
2005
Anwar, Arif A.
e9a57bb7-5225-45e6-9a69-2396a6e4fd31
Clarke, Derek
9746f367-1df2-4e0e-8d71-5ecfc9ddd000
Anwar, Arif A. and Clarke, Derek
(2005)
Design of hydraulically efficient power-law channels with freeboard.
Journal of Irrigation and Drainage Engineering, ASCE, 131 (6), .
(doi:10.1061/(ASCE)0733-9437(2005)131:6(560)).
Abstract
A power law-channel is a generalized form of the parabolic channel. The exponent of the governing equation is a variable that for certain maximum permissible side slopes can be determined by maximizing the cross-sectional area of flow (or minimizing the wetted perimeter). Using this exponent rather than the constant allows a hydraulically more efficient open channel section to be designed. In earlier work on power law channels freeboard was neglected to simplify the analysis. However as pointed out by several authors, a channel without freeboard is of academic interest only and not practical. All open channels are in practice designed and constructed with freeboard as a factor of safety. In this paper freeboard has been introduced as an additional parameter to be taken into account when designing a power law channel. The work from this paper is applied to an earlier example of a parabolic channel to demonstrate a practical design.
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Published date: 2005
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Local EPrints ID: 39402
URI: http://eprints.soton.ac.uk/id/eprint/39402
ISSN: 0733-9437
PURE UUID: 2a6085dc-2506-47f7-91fe-72a8e8a6b7e6
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Date deposited: 28 Jun 2006
Last modified: 16 Mar 2024 02:55
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