A catchment-scale assessment of anabranching in the 140 000 km2 Fitzroy River catchment, north-eastern Australia

Amos, Kathryn J., Croke, Jacky C., Hughes, Andrew, Chapman, Joanne, Takken, Ingrid and Lymburner, Leo (2008) A catchment-scale assessment of anabranching in the 140 000 km2 Fitzroy River catchment, north-eastern Australia. Earth Surface Processes and Landforms, 33 8: 1222-1241. doi:10.1002/esp.1609


Author Amos, Kathryn J.
Croke, Jacky C.
Hughes, Andrew
Chapman, Joanne
Takken, Ingrid
Lymburner, Leo
Title A catchment-scale assessment of anabranching in the 140 000 km2 Fitzroy River catchment, north-eastern Australia
Journal name Earth Surface Processes and Landforms   Check publisher's open access policy
ISSN 0197-9337
1096-9837
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1002/esp.1609
Volume 33
Issue 8
Start page 1222
End page 1241
Total pages 20
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley and Sons Ltd.
Language eng
Formatted abstract
This paper presents a catchment-scale investigation of anabranching in the moderately large 143 000 km2 Fitzroy River catchment in north-eastern Australia. The primary aim is to determine whether mapped and remotely sensed data can provide useful information about the characteristics of anabranching in a catchment of this scale. Anabranching comprises 6% of the total channel network by length, and 24% of higher-order channels (those with catchment areas over 100 km2). Three anabranching planform morphologies are described, which occur in geographically distinct regions, and add to previous descriptions of anabranching rivers. Sinuosity and link length are calculated for all channels of the mapped channel network (a link is a stretch of river between two stream junctions). Slope, mean floodplain width, mean annual rainfall and underlying and catchment geology parameters are calculated for links of a stream network derived from a digital elevation model (DEM), in which each link has either a single channel or anabranching morphology. Anabranching and single channel links do not occupy different ranges of attribute values, and a logistic regression analysis was unable to predict anabranching. However, slope, catchment area, mean floodplain width, length and sinuosity parameters all have significantly different means when comparing single channel with anabranching links, although it is shown that the difference in mean floodplain widths is the result of its correlation with catchment area. Anabranching channels have a tendency towards shorter link lengths, lower sinuosities and lower valley slopes and occur at larger catchment areas than single channels. These differences are discussed in the context of published hypotheses regarding the cause of anabranching. However, the spatial resolution and precision of our data limit our ability to investigate controls on anabranching, which will require detailed measurement of variables at a reach scale.
Keyword Anabranching
Drainage network
Remote sensing
River pattern
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: Thu, 27 Nov 2014, 00:30:47 EST by Helen Smith on behalf of School of Geography, Planning & Env Management