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Prediction of time-dependent channel meander migration based on large-scale laboratory experiments / Po-Hung Yeh in Journal of hydraulic research, Vol. 49 N° 5 (Septembre/Octobre 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 617-629 Titre : Prediction of time-dependent channel meander migration based on large-scale laboratory experiments Type de document : texte imprimé Auteurs : Po-Hung Yeh, Auteur ; Namgyu Park, Auteur ; Chang, Kuang-An, Auteur Année de publication : 2011 Article en page(s) : pp. 617-629 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Meander  migration  Migration  rate  Secondary  flow  Soil  property  Thalweg Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Channel centreline migration rates were derived from a set of large-scale laboratory experiments. The channel radius of curvature, bend angle, and discharge were varied to evaluate correlations between the channel centreline migration rate and the controlling geometry and hydraulic conditions. An excessive Froude number was adopted to account for soil resistance strength. The intersection of the channel centreline between two consecutive time steps was identified. A phase lag of angle to channel curvature exists in both channel plan form and the onset of cross-section scour. The migration rate between two successive inflection points of migration exhibits a growth and decay pattern and is modelled using a sine function related to the channel geometry, the flow condition, and the soil property. A three-equation prediction method was developed and applied to a natural river in Texas. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.596704 [article] Prediction of time-dependent channel meander migration based on large-scale laboratory experiments [texte imprimé] / Po-Hung Yeh, Auteur ; Namgyu Park, Auteur ; Chang, Kuang-An, Auteur . - 2011 . - pp. 617-629. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 617-629 Mots-clés : Meander  migration  Migration  rate  Secondary  flow  Soil  property  Thalweg Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Channel centreline migration rates were derived from a set of large-scale laboratory experiments. The channel radius of curvature, bend angle, and discharge were varied to evaluate correlations between the channel centreline migration rate and the controlling geometry and hydraulic conditions. An excessive Froude number was adopted to account for soil resistance strength. The intersection of the channel centreline between two consecutive time steps was identified. A phase lag of angle to channel curvature exists in both channel plan form and the onset of cross-section scour. The migration rate between two successive inflection points of migration exhibits a growth and decay pattern and is modelled using a sine function related to the channel geometry, the flow condition, and the soil property. A three-equation prediction method was developed and applied to a natural river in Texas. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.596704