Morphology of the Kosi megafan channels

Abstract : We report on a new set of measurements on the morphology of braided and meandering threads of the Kosi megafan, North Bihar, India. All threads develop on a uniform sandy sediment and under a similar climate. The data set is composed of the width, depth, water discharge and grain size of 51 threads. Downstream slopes and sinuosity are also available. Using this data set, we show that braided and meandering threads share common hydraulic geometries. We then use the threshold theory to explain why the aspect ratio of threads is almost naturally detrended, and rescale the data according to this theory. As expected, the rescaled dimensions of braided and meandering threads are weakly correlated to water discharge. We propose that the large dispersion observed, which is common to meandering and braided threads, is the signature of sediment transport, vegetation or cohesion effects.
Type de document :
Article dans une revue
Earth Surface Dynamics, European Geosciences Union, 2015, 3 (3), pp.321-331. 〈10.5194/esurf-3-321-2015〉
Liste complète des métadonnées

Littérature citée [53 références]  Voir  Masquer  Télécharger

https://hal-univ-diderot.archives-ouvertes.fr/hal-01499419
Contributeur : François Métivier <>
Soumis le : vendredi 31 mars 2017 - 16:30:02
Dernière modification le : lundi 13 août 2018 - 16:52:02
Document(s) archivé(s) le : samedi 1 juillet 2017 - 13:20:18

Fichier

esurf-3-321-2015.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Licence


Distributed under a Creative Commons Paternité 4.0 International License

Identifiants

Collections

INSU | IPGP | USPC

Citation

Kumar Gaurav, François Métivier, Olivier Devauchelle, Rajiv Sinha, Hugo Chauvet, et al.. Morphology of the Kosi megafan channels. Earth Surface Dynamics, European Geosciences Union, 2015, 3 (3), pp.321-331. 〈10.5194/esurf-3-321-2015〉. 〈hal-01499419〉

Partager

Métriques

Consultations de la notice

231

Téléchargements de fichiers

224