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Modelling of erosion in rock spillway channels
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-8360-9051
KTH Royal Institute of Technology, Stockholm, Sweden.
Uniper – Sydkraft Hydropower AB, Östersund, Sweden.
2023 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Erosion of rock channels downstream spillways may cause the significant deterioration of the spillways, raisingconcern for the safety of the dam. To evaluate the occurrence of rock erosion, this paper aims to employ a resolvedComputational Fluid Dynamics (CFD)-Discrete Element Method (DEM) approach to model the erosion process of asingle rock block and to investigate the effects of different parameters. The approach models the interaction behaviorsbetween flowing water and rock blocks. Simulation results visualize the erosion process of the rock block, whichprovides a reference to determine the threshold of the initiation of rock erosion. The results show that the incipientmotion of the rock block is significantly affected by the joint aperture. With the increase of the joint aperture size, thepressure distribution on the block surface is altered. Simulation results of the rough channel model are compared witha smooth model, which points out the influence of channel roughness on the rock erosion process.

Abstract [fr]

Lérosion des canaux rocheux en aval des déversoirs peut entraîner une détérioration importante des déversoirs, ce quisoulève des inquiétudes quant à la sécurité du barrage. Pour évaluer simplement loccurrence de lérosion rocheuse, cetarticle vise à utiliser une approche résolue de la dynamique des fluides computationnelle (CFD)-méthode des élémentsdiscrets (DEM) pour modéliser le processus dérosion dun seul bloc de roche et pour étudier les effets de différentsparamètres. Lapproche modélise les comportements dinteraction entre leau courante et les blocs rocheux. Les résultatsde la simulation visualisent le processus dérosion du bloc rocheux, ce qui fournit une référence pour déterminer leseuil de l’initiation de lérosion . Les résultats montrent que le mouvement initial du bloc rocheux est significativementaffecté par louverture du joint. Avec laugmentation de la taille de louverture du joint, la répartition de la pression surla surface du bloc est modifiée. Les résultats de simulation du modèle de canal rugueux sont comparés à un modèlelisse, ce qui souligne linfluence significative de la rugosité du canal sur le processus dérosion de la roche

Place, publisher, year, edition, pages
Canadian Dam Association (CDA) , 2023.
Keywords [en]
Spillway, Dam Safety, Rock Erosion, CFDEM
National Category
Geotechnical Engineering Other Civil Engineering
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-102359OAI: oai:DiVA.org:ltu-102359DiVA, id: diva2:1810776
Conference
Canadian Dam Association (CDA) 2023 Annual Conference & Trade Show, Winnipeg, Manitoba, Canada, October 22-25, 2023
Available from: 2023-11-09 Created: 2023-11-09 Last updated: 2024-01-12Bibliographically approved

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Teng, PenghuaHellström, J. Gunnar I.

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CiteExportLink to record
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