Research Article
Aug 1974
Free Surface Slopes at Controls in Channel Flow
This article has a reply.
VIEW THE REPLYThis article has a reply.
VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 100, Issue 8
Abstract
It is commonly held that the slope of a free water surface in steady open channel flow is indeterminate at a control section. It is shown that the surface slope is finite and, subject to certain approximations, determinate. Expressions are derived for the surface slopes of critical flows over a smooth weir and through a smooth contraction. Experiments confirmed the validity of these expressions up to the surface slopes of tan-¹0.3 for weirs and tan -¹0.8 for contractions. It is shown that the same expressions could have been obtained using the one-dimensional energy equation, even though the assumption of hydrostatic pressure is not valid. The expression derived for the water surface slope yields a well-conditioned equation for numerical calculation of water surface profiles through a control. The possibility of using surface slope at a control section as a rating parameter is mentioned.
Get full access to this article
View all available purchase options and get full access to this article.
Information & Authors
Information
Published In
Journal of the Hydraulics Division
Volume 100 • Issue 8 • August 1974
Pages: 1107 - 1117
Copyright
© 1974 American Society of Civil Engineers.
History
Published in print: Aug 1974
Published online: Feb 3, 2021
Permissions
Request permissions for this article.
Authors
Affiliations
David L. Wilkinson
Lee., Water Research Lab., Univ. of New South Wales, Manly Vale, New South Wales
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.
Cited by
View Options
Get Access
Access content
Please select your options to get access
Log in/Register
Log in via your institution (Shibboleth)
ASCE Members:
Please log in to see member pricing
Purchase
Save for later Item saved, go to cart Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Get Access
Access content
Please select your options to get access
Log in/Register
Log in via your institution (Shibboleth)
ASCE Members:
Please log in to see member pricing
Purchase
Save for later Item saved, go to cart Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.