A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways

In recent years, rock scouring or erosion downstream of dams has become an increasing dam safety concern. Several theoretical, semi-theoretical, semi-analytical and numerical methods can be used to assess the rock erosion in hydraulic structures. Semi-theoretical approaches determine the correlation...

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Autores principales:	Yavar Jalili Kashtiban, Ali Saeidi, Marie-Isabelle Farinas, Marco Quirion
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	erodibility scour spillways plunge pools dam hydraulic Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/703daf1fb94b4998a1478fcbbef21e97
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spelling	oai:doaj.org-article:703daf1fb94b4998a1478fcbbef21e972021-11-25T19:15:33ZA Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways10.3390/w132232052073-4441https://doaj.org/article/703daf1fb94b4998a1478fcbbef21e972021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/22/3205https://doaj.org/toc/2073-4441In recent years, rock scouring or erosion downstream of dams has become an increasing dam safety concern. Several theoretical, semi-theoretical, semi-analytical and numerical methods can be used to assess the rock erosion in hydraulic structures. Semi-theoretical approaches determine the correlation between the erosive intensity of fluid flow and the resistive capacity of rock. Such approaches establish the scour thresholds as a function of erosive intensity of water and several rock mass indices by using in situ data and a curve-fitting approach. In some studies, the excavatability index, initially developed for rock mass stability analysis, was used to analyse the rock mass resistance in hydraulic erodibility analysis. The effectivity and weight of the geomechanical parameters used are yet to be determined on the basis of the erodibility phenomenon. The semi-analytical methods are developed on the basis of the mechanical and hydraulic interaction of rock mass and water. Four methods developed by Bollaert et al. are important in determining the erodibility in the plunge pool, but they are not applicable in the case of spillways. They used the comprehensive fracture mechanics for closed-end joints, quasi-steady impulsion, and dynamic impulsion (<i>DI</i>) for blocky rock erosion. The application of these methods to each site is necessary to identify constants that are difficult to determine. Few numerical methods are available to assess the rock mass erosion in hydraulic structures. In the case of numerical methods, the erosive agent is indistinct, and the hydraulic hazard parameter on the spillway surface is almost challenging to apply. This study comprehensively reviews the mechanism of erosion and the methods for assessing the risk of potential rock mass erosion downstream of dams and hydraulic structures. The advantages and disadvantages of all methods are discussed and the potential future research directions in this domain are proposed.Yavar Jalili KashtibanAli SaeidiMarie-Isabelle FarinasMarco QuirionMDPI AGarticleerodibilityscourspillwaysplunge poolsdamhydraulicHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3205, p 3205 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	erodibility scour spillways plunge pools dam hydraulic Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	erodibility scour spillways plunge pools dam hydraulic Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Yavar Jalili Kashtiban Ali Saeidi Marie-Isabelle Farinas Marco Quirion A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways
description	In recent years, rock scouring or erosion downstream of dams has become an increasing dam safety concern. Several theoretical, semi-theoretical, semi-analytical and numerical methods can be used to assess the rock erosion in hydraulic structures. Semi-theoretical approaches determine the correlation between the erosive intensity of fluid flow and the resistive capacity of rock. Such approaches establish the scour thresholds as a function of erosive intensity of water and several rock mass indices by using in situ data and a curve-fitting approach. In some studies, the excavatability index, initially developed for rock mass stability analysis, was used to analyse the rock mass resistance in hydraulic erodibility analysis. The effectivity and weight of the geomechanical parameters used are yet to be determined on the basis of the erodibility phenomenon. The semi-analytical methods are developed on the basis of the mechanical and hydraulic interaction of rock mass and water. Four methods developed by Bollaert et al. are important in determining the erodibility in the plunge pool, but they are not applicable in the case of spillways. They used the comprehensive fracture mechanics for closed-end joints, quasi-steady impulsion, and dynamic impulsion (<i>DI</i>) for blocky rock erosion. The application of these methods to each site is necessary to identify constants that are difficult to determine. Few numerical methods are available to assess the rock mass erosion in hydraulic structures. In the case of numerical methods, the erosive agent is indistinct, and the hydraulic hazard parameter on the spillway surface is almost challenging to apply. This study comprehensively reviews the mechanism of erosion and the methods for assessing the risk of potential rock mass erosion downstream of dams and hydraulic structures. The advantages and disadvantages of all methods are discussed and the potential future research directions in this domain are proposed.
format	article
author	Yavar Jalili Kashtiban Ali Saeidi Marie-Isabelle Farinas Marco Quirion
author_facet	Yavar Jalili Kashtiban Ali Saeidi Marie-Isabelle Farinas Marco Quirion
author_sort	Yavar Jalili Kashtiban
title	A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways
title_short	A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways
title_full	A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways
title_fullStr	A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways
title_full_unstemmed	A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways
title_sort	review on existing methods to assess hydraulic erodibility downstream of dam spillways
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/703daf1fb94b4998a1478fcbbef21e97
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A Review on Existing Methods to Assess Hydraulic Erodibility Downstream of Dam Spillways

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