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Design of hydraulically efficient power-law channels with freeboard

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.
0733-9437
560-563
Anwar, Arif A.
e9a57bb7-5225-45e6-9a69-2396a6e4fd31
Clarke, Derek
9746f367-1df2-4e0e-8d71-5ecfc9ddd000
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), 560-563. (doi:10.1061/(ASCE)0733-9437(2005)131:6(560)).

Record type: Article

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

Identifiers

Local EPrints ID: 39402
URI: http://eprints.soton.ac.uk/id/eprint/39402
ISSN: 0733-9437
PURE UUID: 2a6085dc-2506-47f7-91fe-72a8e8a6b7e6
ORCID for Arif A. Anwar: ORCID iD orcid.org/0000-0002-3071-3197
ORCID for Derek Clarke: ORCID iD orcid.org/0000-0002-5433-5258

Catalogue record

Date deposited: 28 Jun 2006
Last modified: 19 Nov 2019 02:05

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