Article

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

Journal of Hydraulic Engineering

António Trigo Relvas; António Alberto do Nascimento Pinheiro — 2008

Key information

Authors:

António Trigo Relvas; António Alberto do Nascimento Pinheiro (António N. Pinheiro)

Published in

August 2008

Abstract

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.

Publication details

Authors in the community:

Title of the publication container

Journal of Hydraulic Engineering

First page or article number

1042

Last page

1051

Volume

134

Issue

8

Fields of Science and Technology (FOS)

civil-engineering - Civil engineering

Publication language (ISO code)

eng - English

Rights type:

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