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Role of a rheophyte in bench development on a sand-bed river in southeast Australia

Auteur(s) et Affiliation(s)

ERSKINE, W.
Sustainable Use of Coasts and Catchments, School of Environmental and Life Sciences, Univ. of Newcastle, Ourimbah, Australie
CHALMERS, A.
Sustainable Use of Coasts and Catchments, School of Environmental and Life Sciences, Univ. of Newcastle, Ourimbah, Australie
KEENE, A.
Southern Cross Geoscience, Southern Cross Univ., Lismore, Australie
CHEETHAM, M.
Southern Cross Geoscience, Southern Cross Univ., Lismore, Australie
BUSH, R.
Southern Cross Geoscience, Southern Cross Univ., Lismore, Australie


Description :
Casuarina cunninghamiana Miq. is an important rheophytic tree in New South Wales, because it is fast growing and can tolerate flood disturbance. Widden Brook is an active sand-bed stream that has widened substantially since initial European settlement in the early 1800s and is characterized by high flood variability and multi-decadal periods of alternating high and low flood frequency, called flood- and drought-dominated regimes. Channel contraction by bench formation is currently occurring. Recurring catastrophic floods or a sequence of large floods in rapid succession episodically destroy benches by substantial channel widening and initiate a new phase of bar and bench development. A conceptual model of the conversion of point bars to benches by thick mud deposition and C. cunninghamiana recruitment has been developed for sand-bed streams draining similar sandstone catchments.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2009, vol. 34, n°. 7, p. 941-953, nombre de pages : 13, Références bibliographiques : 1,5 p.

Date :
2009

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

Langue :
Anglais
Droits :
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