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A review on existing methods to assess hydraulic erodibility downstream of dam spillways

Jalili Kashtiban Yavar, Saeidi Ali, Farinas Marie-Isabelle et Quirion Marco. (2021). A review on existing methods to assess hydraulic erodibility downstream of dam spillways. Water, 13, (22), p. 3205.

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URL officielle: http://dx.doi.org/doi:10.3390/w13223205

Résumé

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 (DI) 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.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:13
Numéro:22
Pages:p. 3205
Version évaluée par les pairs:Oui
Date:12 Novembre 2021
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Unités de recherche > Chaire de recherche du Canada en prévision et prévention des risques liés aux aléas hydro-géotechniques (P2GeoRISQUE)
Mots-clés:erodibility, scour, spillways, plunge pools, dam, hydraulic, rock mass, érodabilité, affouillement, déversoirs, bassins profonds, barrage, hydraulique, massif rocheux
Déposé le:17 nov. 2021 21:28
Dernière modification:17 nov. 2021 21:28
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