Minimum Specific Energy and Critical Flow Conditions in Open Channels

Chanson, Hubert (2006) Minimum Specific Energy and Critical Flow Conditions in Open Channels. Journal of Irrigation and Drainage Engineering, 132 5: 498-502. doi:10.1061/(ASCE)0733-9437(2006)132:5(498)

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Author Chanson, Hubert
Title Minimum Specific Energy and Critical Flow Conditions in Open Channels
Journal name Journal of Irrigation and Drainage Engineering   Check publisher's open access policy
ISSN 0733-9437
Publication date 2006-08-01
Year available 2006
Sub-type Article (original research)
DOI 10.1061/(ASCE)0733-9437(2006)132:5(498)
Open Access Status File (Author Post-print)
Volume 132
Issue 5
Start page 498
End page 502
Total pages 5
Editor William Ritter
Place of publication United States
Publisher American Society of Civil Engineers
Language eng
Subject 260502 Surfacewater Hydrology
240502 Fluid Physics
240000 Physical Sciences
291100 Environmental Engineering
290000 Engineering and Technology
299904 Engineering/Technology Instrumentation
260000 Earth Sciences
300100 Soil and Water Sciences
300000 Agricultural, Veterinary and Environmental Sciences
240500 Classical Physics
260500 Hydrology
290802 Water and Sanitary Engineering
300105 Applied Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
290800 Civil Engineering
291103 Environmental Engineering Design
290899 Civil Engineering not elsewhere classified
770402 Land and water management
Abstract In open channels, the relationship between the specific energy and the flow depth exhibits a minimum, and the corresponding flow conditions are called critical flow conditions. Herein they are re-analysed on the basis of the depth-averaged Bernoulli equation. At critical flow, there is only one possible flow depth, and a new analytical expression of that characteristic depth is developed for ideal-fluid flow situations with non-hydrostatic pressure distribution and non-uniform velocity distribution. The results are applied to relevant critical flow conditions : e.g., at the crest of a spillway. The finding may be applied to predict more accurately the discharge on weir and spillway crests.
Keyword open channel flow
critical flow conditions
minimum specific energy
discharge coefficient
weirs and spillways
Water Resources
Q-Index Code C1
Institutional Status UQ
Additional Notes The full bibliographic details are : CHANSON, H. (2006). "Minimum Specific Energy and Critical Flow Conditions in Open Channels." Journal of Irrigation and Drainage Engineering, ASCE, Vol. 132, No. 5, pp. 498-502 (DOI: 10.1061/(ASCE)0733-9437(2006)132:5(498)) (ISSN 0733-9437). Copyright 2006 The American Society of Civil Engineers.

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Created: Thu, 05 Oct 2006, 10:00:00 EST by Hubert Chanson on behalf of School of Engineering