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Investigation of energy dissipation in Gabion stepped weirs

conference contribution
posted on 01.01.2017, 00:00 authored by M A A A Alabas, Riyadh Al-AmeriRiyadh Al-Ameri, Lloyd ChuaLloyd Chua, Subrat DasSubrat Das
Weirs are widely used in hydraulic structures to control and regulate flow in open channels. Gabion weirs are frequently used in rivers, small dams, energy dissipaters, flood control works, and check dams, among other uses, and can be used to build a stepped weir. Dissipation of the energy (kinetic energy) on spillways or weirs is important to protect both hydraulic structures and downstream channels. This study aims to investigate the energy dissipation in gabion stepped weirs. For this purpose, six lab scale models of gabion stepped weirs each with six levels of impervious stepped weirs were investigated, which includes two downstream slopes (1:1 & 1:2, V:H) and three step face geometry (normal, end sill, and inclined steps). The rock fill material is crushed stone of nominal size (13.2 mm–19.0 mm), with a porosity of 0.42. Results showed that gabion weirs have more energy dissipation than impervious weirs around 20% at low discharge and only 3% at high discharge. Moreover, the step face geometry is more effective at medium discharge (nappe and transition flow regimes), while there is no effect at low and high discharge (through and skimming flow regimes). Finally, it was found that the energy dissipation increased with decreases in the downstream slope for all step configurations.

History

Event

Iraqi Ministry of Higher Education and Scientific Research. Conference (1st : 2017 : Melbourne, Vic.)

Series

Iraqi Ministry of Higher Education and Scientific Research Conference

Pagination

65 - 71

Publisher

Swinburne University of Technology

Location

Melbourne, Vic.

Place of publication

Melbourne, Vic.

Start date

05/12/2017

End date

06/12/2017

ISBN-13

9781925761016

Language

eng

Publication classification

E Conference publication; E1 Full written paper - refereed

Copyright notice

2017, Swinburne University of Technology

Editor/Contributor(s)

R Al-Mahaidi, A Al-Mosawe, M Al-Younis

Title of proceedings

ISCA 2017 : Proceedings of The First MoHESR and HCED Iraqi Scholars Conference in Australasia 2017

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