Resource

Inception point and air concentration in flows on stepped chutes lined with wedge-shaped concrete blocks

Resource Type
Industry Papers and Articles
Reference Title
Inception point and air concentration in flows on stepped chutes lined with wedge-shaped concrete blocks
Author/Presenter
Relvas, Antonio T.
Pinheiro, Antonio N.
Organization/Agency
American Society of Civil Engineers
Publisher Name
American Society of Civil Engineers
Year
2008
Date
08/2008
Journal Title
Journal of Hydraulic Engineering
Journal Volume
134
Journal Issue
8
ISBN/ISSN
ISSN: 0733-9429
Abstract/Additional Information

"Stepped channels lined with wedge-shaped concrete blocks are a promising solution to provide overtopping protection for embankment dams if the discharge capacity of existing spillways is not adequate. The paper addresses the characteristics of the two-phase transition and skimming flows in stepped channels lined with this type of block. An experimental setup was developed with two flumes designed with a relative scale of 1:2.5. Air concentration was measured with an optical probe in several cross sections of both flumes. The scale effects are analyzed. An expression for the location of the inception point is proposed. The vertical air concentration profiles and their longitudinal variation are studied, considering data and models proposed by other researchers. The establishment of the uniform flow regime is analyzed. ; 2008 ASCE."