Morphodynamics of an extended bar complex, Fraser River, British Columbia

Auteur(s) et Affiliation(s)

HAM, D.

Northwest Hydraulic Consultants, British Columbia, North Vancouver, Canada

CHURCH, M.

Dep. of Geography, Univ. of British Columbia, Vancouver, Canada

Description :
The AA. investigate large-scale morphologic changes over a 65-year period in a major sedimentation zone within the 50 km long wandering gravel-bed reach of Lower Fraser River. This reach remains in a relatively pristine state. A template of channel evolutionary development is identified, consisting of extended periods of orderly accretion of unit bars by deposition of gravel sheets, controlled by the major riffles in the river. When this process constricts channel conveyance an avulsion occurs and the major bar complexes are reorganized. The recognition of fairly predictable short-term behavior can potentially aid the development of models of sediment transport and channel evolution. Accordingly, results of the detailed descriptive analysis are compared with a GIS-based probabilistic approach developed from transition-state analysis.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2012, vol. 37, n°. 10, p. 1074-1089, nombre de pages : 16, Références bibliographiques : 1 p.

Date :
2012

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

Langue :
Anglais