A new framework for modeling the migration of meandering rivers

Auteur(s) et Affiliation(s)

PARKER, G.

Department of Civil and Environmental Engineering and Department of Geology, Southern Illinois University, Urbana, Etats-Unis

SHIMIZU, Y.

Laboratory of Hydraulic Research, Graduate School of Engineering, Hokkaido University, Sapporo, Japon

WILKERSON, G.V.

Department of Civil and Environmental Engineering, Southern Illinois University, Carbondale, Etats-Unis

EKE, E.C.

Department of Civil and Environmental Engineering and Department of Geology, Southern Illinois University, Urbana, Etats-Unis

ABAD, J.D.

Department of Civil and Environmental Engineering, University of Illinois, Urbana, Etats-Unis

LAUER, J.W.

Department of Civil and Environmental Engineering, Seattle University, Seattle, Etats-Unis

PAOLA, C.

Department of Geology and Geophysics and St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, Etats-Unis

DIETRICH, W.E.

Department of Earth and Planetary Science, University of California, Berkeley, Etats-Unis

VOLLERS, V.R.

Department of Civil Engineering and St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, Etats-Unis

Description :
Here a new model is presented, in which separate relations are developed for the migration of the eroding bank and the depositing bank. It is assumed that the eroding bank consists of a layer of fine-grained sediment that is cohesive and/or densely riddled with roots, underlain by a purely noncohesive layer of sand and/or gravel. Following erosion of the noncohesive layer, the cohesive layer fails in the form of slump blocks, which armor the noncohesive layer and thereby moderate the erosion rate. Separate equations describing the migration of the eroding and depositing banks are tied to a standard morphodynamic formulation for the evolution of the flow and bed in the central region of the channel. The model allows for both (a) migration for which erosion widens the channel, forcing deposition at the opposite bank, and (b) migration for which deposition narrows the channel forcing erosion at the opposite bank.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 1, p. 70-86, nombre de pages : 17, Références bibliographiques : 2,5 p.

Date :
2011

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

Langue :
Anglais