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| HAL : hal-00678690, version 1 |
| DOI : 10.1061/(ASCE)HY.1943-7900.0000371 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Hydraulic Engineering 137, 9 (2011) 932-944 |
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| Dynamic Routing of Flow Resistance and Alluvial Bed-Form Changes from the Lower to the Upper Regime |
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| Nicolas Huybrechts 1G. V. Luong 2 |
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| (09/2011) |
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| On the basis of a Strouhal number and the definition of the control factor, m, a new routing to calculate the energy slope in the lower and upper alluvial regimes is proposed. The control factor, m, representing the interactions in alluvial rivers, is reckoned as a bed-form index: while the flow evolves through transition, the control factor, m, decreases from m=2, associated with two-dimensional fully developed dunes, to m=1, associated primarily with in-phase waves. The way to predict the value of the control factor, m, is drawn from a previously published criterion for delineating the upper regime and is calibrated with experimental data. On several data from flumes and rivers, the routing is tested and compared with other methods from the literature. It appears that the new routing is the most robust because it allows researchers to obtain low averages of the discrepancy ratio for a wide range of ratios between the water depth and the median sediment diameter. On a selection of contrasted freshet events, the new routing allows for the capture of the primary dynamic of the flow resistance decrease. |
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| 1 : | Laboratoire d'Hydraulique Saint-Venant / Saint-Venant Laboratory for Hydraulics (Saint-Venant) |
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Université Paris-Est Créteil Val-de-Marne (UPEC) – Ecole des Ponts ParisTech – EDF – CETMEF |
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| 2 : | Departement of Water Pollution Control |
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Université Libre de Bruxelles |
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| 3 : | Yellow River Institute of Hydraulic Research |
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Yellow River Conservancy Commission |
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| 4 : | Laboratoire National d'Hydraulique et d'Environnement (LNHE) |
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EDF Recherche et Développement |
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| 5 : | Departement of Water Pollution Control |
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Université Libre de Bruxelles |
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| Domaine | : | Sciences de l'ingénieur/Mécanique/Mécanique des fluides Physique/Mécanique/Mécanique des fluides |
| hal-00678690, version 1 | |
| http://hal-enpc.archives-ouvertes.fr/hal-00678690 | |
| oai:hal-enpc.archives-ouvertes.fr:hal-00678690 | |
| Contributeur : Christophe Kassiotis | |
| Soumis le : Mardi 13 Mars 2012, 15:55:34 | |
| Dernière modification le : Mercredi 14 Mars 2012, 18:08:33 | |
