A catchment-scale model of mountain stream channel morphologies in southeast Australia

Thompson, Chris, Croke, Jacky and Takken, Ingrid (2008) A catchment-scale model of mountain stream channel morphologies in southeast Australia. Geomorphology, 95 3-4: 119-144. doi:10.1016/j.geomorph.2007.05.015


Author Thompson, Chris
Croke, Jacky
Takken, Ingrid
Title A catchment-scale model of mountain stream channel morphologies in southeast Australia
Journal name Geomorphology   Check publisher's open access policy
ISSN 0169-555X
1872-695X
Publication date 2008
Sub-type Article (original research)
DOI 10.1016/j.geomorph.2007.05.015
Open Access Status
Volume 95
Issue 3-4
Start page 119
End page 144
Total pages 26
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract The position of mountain streams high in the channel network and their proportional dominance mean that channel modifications and adjustments within these systems will have important implications for downstream processes and linkages. This study develops an analysis framework for examining the catchment-scale distribution of reach morphologies, and the relationship among reach type, catchment lithology and flow competence in southeast Australian mountain streams. The analysis framework is applied to three catchments which have contrasting proportions of the two dominant lithologies of the region, Devonian granites and Ordovician metasediments. The model successfully delineated 68% of reach types, and the resultant spatial maps allowed the effects of stream network position and catchment specific controls on channel morphology to be evaluated. Maximum lengths of the majority of reach morphology types were in second-order streams and the maximum number of morphology types (six) was present in third-order streams, with dramatic reductions in reach type variability as the network expands. The position of catchment lithology within the channel network structure was recognized as more important than the aerial extent of a particular lithology on the distribution and abundance of reach morphologies. The model provides an important tool in the management of channel networks for the protection or restoration of ecological diversity, by identifying river segments and tributaries with high morphological diversity.
Keyword Competence
GIS
Mountain streams
Reach morphology
Stream power
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
 
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Created: Wed, 26 Nov 2014, 14:36:23 EST by Helen Smith on behalf of School of Geography, Planning & Env Management