Modelling hyperconcentrated flow in the Yellow River

Auteur(s) et Affiliation(s)



Description :
The aim of this paper is to analyse erosion and depositional processes during hyperconcentrated floods in the Yellow River, using observations and numerical model experiments. Numerical modelling experiments of these floods reveal that sedimentation is largely caused by large vertical concentration gradients, both in the channel during the rising stage of the flood, as well as on the floodplains, during a later stage of the flood. Erosion prevails when the sediment is largely held in suspension due to hindered settling, and is strengthened by the reduced wetted cross-section caused by massive sedimentation on the floodplain. Observed patterns of erosion and sedimentation during these floods can be qualitatively reproduced with a numerical model in which sediment-induced density effects and hindered settling are included.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2009, vol. 34, n°. 4, p. 596-612, nombre de pages : 17, Références bibliographiques : 1 p.

Date :
2009

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley