A morpho-statistical classification of mountain stream reach types in southeastern Australia

Thompson, C. J., Croke, J., Ogden, R. and Wallbrink, P. (2006) A morpho-statistical classification of mountain stream reach types in southeastern Australia. Geomorphology, 81 1-2: 43-65. doi:10.1016/j.geomorph.2006.03.007

Author Thompson, C. J.
Croke, J.
Ogden, R.
Wallbrink, P.
Title A morpho-statistical classification of mountain stream reach types in southeastern Australia
Journal name Geomorphology   Check publisher's open access policy
ISSN 0169-555X
Publication date 2006
Year available 2006
Sub-type Article (original research)
DOI 10.1016/j.geomorph.2006.03.007
Open Access Status
Volume 81
Issue 1-2
Start page 43
End page 65
Total pages 23
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Collection year 2006
Language eng
Formatted abstract
The concepts of sediment transport capacity (Qc) and sediment supply (Qs) have shown promise in broadly differentiating mountain streams. The important role of lithology in determining reach characteristics is also noted but as yet not fully included in existing process domain frameworks. This study uses topographic and grain size surveys undertaken over 42 channel reaches with slopes between 0.01 and 0.20 m/m to describe mountain stream morphology in southeastern Australia. Reaches with two different lithologies are surveyed to specifically address the role of lithology in resultant channel morphology. Spatial autocorrelation analysis based on Moran's I is used to detect the frequency and occurrence of in-stream features, such as bars and pools. These data are combined with the grain size data to describe eight dominant reach morphologies. Most channel morphologies display broad characteristics similar to previous accounts of mountain streams, although a number of intermediate morphologies affecting subtle variations in form and process where evident. There was no significant longitudinal arrangement of the observed morphologies, particularly with respect to catchment area and slope. This is related to the strongly segmented longitudinal profiles characteristic of these streams where increasing catchment area does not result in a commensurate decrease in slope. Five of the eight channel morphologies identified are lithology dependent with respect to grain size and shape. Regime diagrams applied to quantify the physical controls on the different reach morphologies identified different Qc-Qs domains for most morphologies. However, some lithology-dependent morphologies could not be differentiated supporting the need to incorporate the effects of dominant grain shape (or sphericity) in assigning dimensionless critical shear stress values in determining Qs. Overall, the differences in mountain stream reach morphologies described in this study reflect the characteristic segmentation of the longitudinal profiles of these streams and contrasts in the supply and breakdown of parent material
Keyword Mountain stream
Reach morphology
Sediment supply
Spatial Autocorrelation
Transport capacity
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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Citation counts: TR Web of Science Citation Count  Cited 26 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 30 times in Scopus Article | Citations
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Created: Wed, 26 Nov 2014, 15:14:29 EST by Helen Smith on behalf of School of Geography, Planning & Env Management