Quantifying different riverbank erosion processes during an extreme flood event

Auteur(s) et Affiliation(s)

GROVE, J.R.

Dept. of Resource management and Geography, Univ. of Melbourne, Parkville, Australie

CROKE, J.

Australian Rivers Inst., Griffith Univ., Brisbane, Australie

THOMPSON, C.

Centre for Integrated Catchment Assessment and Management (ICAM), Australian National Univ., Canberra, Australie

Description :
The aim of this paper is to determine processes and volumes of riverbank erosion at a catchment scale (Lockyer Creek Catchment in southeast Queensland). Remotely sensed data captured before and after an extreme flood event, enabled a digital elevation model of difference (DoD) to be constructed for the channel and floodplain. Three-dimensional forms of bank failures could be mapped at a resolution that enabled process inference; and the volume and rates of different bank erosion processes over time could be assessed. A classification of riverbank mass failures, integrating form and process, identified 437 mass failure polygons throughout the study area. The failures appeared to be the result of : bank exfiltration, antecedent moisture conditions preceding the event, and the historic development of the channel. It is shown that the availability of repeat LiDAR surveys, combined with high-resolution aerial photography, was very effective in erosion process determination and quantification at a large spatial scale.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 12, p. 1393-1406, nombre de pages : 14, Références bibliographiques : 2 p.

Date :
2013

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

Langue :
Anglais