Morphological and historical resilience to catastrophic flooding: the case of Lockyer Creek, SE Queensland, Australia

Fryirs, Kirstie, Lisenby, Peyton and Croke, Jacky (2015) Morphological and historical resilience to catastrophic flooding: the case of Lockyer Creek, SE Queensland, Australia. Geomorphology, 241 55-71. doi:10.1016/j.geomorph.2015.04.008


Author Fryirs, Kirstie
Lisenby, Peyton
Croke, Jacky
Title Morphological and historical resilience to catastrophic flooding: the case of Lockyer Creek, SE Queensland, Australia
Journal name Geomorphology   Check publisher's open access policy
ISSN 0169-555X
1872-695X
Publication date 2015-07-15
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.geomorph.2015.04.008
Open Access Status
Volume 241
Start page 55
End page 71
Total pages 17
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2016
Language eng
Abstract This study aimed to determine the extent of geomorphic change resulting from the catastrophic flood of 2011 in the Lockyer Valley in southeast Queensland and to place these impacts within a history of geomorphic adjustment. Aerial photographs dated from 1933 to 2011 and parish maps and historical on-ground photographs dating from 1865 to 1966 were examined for evidence of geomorphic adjustment since European settlement in the first half of the nineteenth century. Eleven forms of geomorphic adjustment were identified in three categories; erosional, depositional, and reorganisational. Only 26% of the Lockyer Creek channel length has been affected by some form of geomorphic adjustment since European settlement. Most of this adjustment was localised and dominated by reorganisation of geomorphic unit assemblages within the macrochannel and sediment deposition on floodplains. No wholesale river change in the form of lateral migration or avulsion has occurred, and the river's morphology has remained relatively characteristic over time (i.e., morphology remains relatively uniform in a reach-averaged sense). Geomorphic responses to extreme flooding have been minor, and the geomorphic effectiveness of floods in this system (including the 2011 flood) has been limited over the last several hundred years. The system is likely still adjusting to past flooding events that 'set' the morphology of the current system (i.e., the macrochannel). A form of event resilience has resulted in this system such that it is less prone to geomorphic adjustment during events than would normally be considered geomorphically effective. As a result, antecedent controls on macrochannel presence and capacity are considered to be first-order controls on contemporary forms and processes in this system. Work is required to test whether the resilience of this system will hold in the future, with more extreme episodes of flooding predicted to occur in this region under future climate change.
Keyword Antecedent control
Catastrophic flood
Evolutionary trajectory
Lockyer creek
River change
River sensitivity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2016 Collection
 
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