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Conditions for a better agreement between sediment transport formulas and surveys in alluvial streams / Alfonso Pujol in Journal of hydraulic research, Vol. 46 n°3 (2008) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 46 n°3 (2008) . - pp. 317-321 Titre : Conditions for a better agreement between sediment transport formulas and surveys in alluvial streams Titre original : Conditions pour un meilleur accord entre les formules de transport de sédiment et les observations dans les rivières alluviales Type de document : texte imprimé Auteurs : Alfonso Pujol, Auteur Article en page(s) : pp. 317-321 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Alluvial  streams  Bed-material  load  formulas  Fluvial  hydraulics  Sediments  surveys 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 : This contribution proposes additional sediment sampling beyond what is customary done in practice, with the goal of enhancing the estimation of sediment transport rates from data collected in the field. The analysis is restricted to large, low-land, alluvial rivers, with bed and banks formed by non-cohesive sediment, which are free to change their depth, width and slope. In particular, the analysis concentrates on dune-covered rivers under steady or quasi-steady, lower-regime flow conditions. Pujol et al. (2004) have shown by means of the Engelund-Hansen sediment transport formula that when a relation is recalibrated using laboratory and field data complying with the above restrictions, the agreement between computed results and observations greatly improves. Motivated by such ideas, the approach proposed herein consists of taking several suspended sediment samples and in surveying bed longitudinal profiles, along streamlines covering several dunes. It is expected that this additional work will improve the quality of field observations, and will facilitate the application of sediment transport relations developed with laboratory observations to field conditions. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Conditions for a better agreement between sediment transport formulas and surveys in alluvial streams = Conditions pour un meilleur accord entre les formules de transport de sédiment et les observations dans les rivières alluviales [texte imprimé] / Alfonso Pujol, Auteur . - pp. 317-321. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 46 n°3 (2008) . - pp. 317-321 Mots-clés : Alluvial  streams  Bed-material  load  formulas  Fluvial  hydraulics  Sediments  surveys 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 : This contribution proposes additional sediment sampling beyond what is customary done in practice, with the goal of enhancing the estimation of sediment transport rates from data collected in the field. The analysis is restricted to large, low-land, alluvial rivers, with bed and banks formed by non-cohesive sediment, which are free to change their depth, width and slope. In particular, the analysis concentrates on dune-covered rivers under steady or quasi-steady, lower-regime flow conditions. Pujol et al. (2004) have shown by means of the Engelund-Hansen sediment transport formula that when a relation is recalibrated using laboratory and field data complying with the above restrictions, the agreement between computed results and observations greatly improves. Motivated by such ideas, the approach proposed herein consists of taking several suspended sediment samples and in surveying bed longitudinal profiles, along streamlines covering several dunes. It is expected that this additional work will improve the quality of field observations, and will facilitate the application of sediment transport relations developed with laboratory observations to field conditions. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com