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Three-dimensional numerical modelling of reservoir flushing in a prototype scale / Stefan Haun in JRBM : International journal of river basin management, Vol. 10 N° 4 (Décembre 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 4 (Décembre 2012) . - pp. 341-349 Titre : Three-dimensional numerical modelling of reservoir flushing in a prototype scale Type de document : texte imprimé Auteurs : Stefan Haun, Auteur ; Nils Reidar B. Olsen, Auteur Année de publication : 2013 Article en page(s) : pp. 341-349 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Erosion  processes  Lakes  and  reservoirs  RANS  models  Three-dimensional  models  Water-sediment  interface  interactions Résumé : A fully three-dimensional numerical model for reservoir flushing has been tested against field measurements for the Angostura reservoir in Costa Rica. The numerical program solves the Reynolds-averaged Navier–Stokes (RANS) equations in three-dimensions and uses for discretization the finite-volume method together with a second-order upwind scheme. The used grid is unstructured and non-orthogonal, made of a mixture of hexahedral and tetrahedral cells. In addition to the bathymetry data of the prototype, the model uses grain size distributions of the bed, discharge rates and water levels during the flushing. Simulated bed level changes during the flushing are presented in this study as well as the computed amount of eroded sediments. Where the amount of flushed out sediments show reasonable agreement, differences in the developed flushing channel simulated by the model and compared to the prototype were observed. However, the presented study shows that due to the increasing development of three-dimensional RANS models, the simulation of a reservoir flushing in a prototype becomes feasible. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.736388 [article] Three-dimensional numerical modelling of reservoir flushing in a prototype scale [texte imprimé] / Stefan Haun, Auteur ; Nils Reidar B. Olsen, Auteur . - 2013 . - pp. 341-349. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 4 (Décembre 2012) . - pp. 341-349 Mots-clés : Erosion  processes  Lakes  and  reservoirs  RANS  models  Three-dimensional  models  Water-sediment  interface  interactions Résumé : A fully three-dimensional numerical model for reservoir flushing has been tested against field measurements for the Angostura reservoir in Costa Rica. The numerical program solves the Reynolds-averaged Navier–Stokes (RANS) equations in three-dimensions and uses for discretization the finite-volume method together with a second-order upwind scheme. The used grid is unstructured and non-orthogonal, made of a mixture of hexahedral and tetrahedral cells. In addition to the bathymetry data of the prototype, the model uses grain size distributions of the bed, discharge rates and water levels during the flushing. Simulated bed level changes during the flushing are presented in this study as well as the computed amount of eroded sediments. Where the amount of flushed out sediments show reasonable agreement, differences in the developed flushing channel simulated by the model and compared to the prototype were observed. However, the presented study shows that due to the increasing development of three-dimensional RANS models, the simulation of a reservoir flushing in a prototype becomes feasible. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.736388