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Computational investigation of hydraulic performance variation with geometry in gabion stepped spillways / Dominic E. Reeve; Ali Adel Zuhaira; Harshinie Karunarathna

Water Science and Engineering

Swansea University Author: Karunarathna, Harshinie

Abstract

Over recent years, there has been a clear increase in the frequency of reported flooding events around the world. Gabion structures offer one means of flood mitigation in dam spillways. These types of structures provide an additional challenge to the computational modeller in that flow through the p...

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Published in: Water Science and Engineering
ISSN: 1674-2370
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa49956
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Abstract: Over recent years, there has been a clear increase in the frequency of reported flooding events around the world. Gabion structures offer one means of flood mitigation in dam spillways. These types of structures provide an additional challenge to the computational modeller in that flow through the porous gabions must be simulated. We have used a computational model to investigate the flow over gabion stepped spillways. The model was first validated against published experimental results. Then, gabion stepped spillways with four different step geometries were tested under the same conditions in order to facilitate inter-comparisons and to choose the best option in terms of energy dissipation. The results show that normal gabion steps can dissipate more energy than overlap, inclined, and pooled steps. An intensive set of tests with varying slope, stone size, and porosity were undertaken. The location of the inception point and the water depth at this point obtained from this study were compared with those from existing formulae. Two new empirical equations have been derived, on the basis of regression, to provide improved results for gabion stepped spillways.
Keywords: Computational modelling, Energy dissipation, Gabion stepped spillways, Inception point location, Skimming flow
College: College of Engineering