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

摘要: This study aimed to determine the extent of geomorphic change resulting from catastrophic flood 2011 in Lockyer Valley southeast Queensland and place these impacts within a history adjustment. Aerial photographs dated 1933 parish maps historical on-ground dating 1865 1966 were examined for evidence adjustment since European settlement first half nineteenth century. Eleven forms identified three categories; erosional, depositional, reorganisational. Only 26% Creek channel length has been affected by some form settlement. Most this was localised dominated reorganisation unit assemblages macrochannel sediment deposition on floodplains. No wholesale river lateral migration or avulsion occurred, river's morphology remained relatively characteristic over time (i.e., remains uniform reach-averaged sense). Geomorphic responses extreme flooding have minor, effectiveness floods system (including flood) limited last several hundred years. The is likely still adjusting past events that ‘set’ current macrochannel). A event resilience resulted such it less prone during than would normally be considered geomorphically effective. As result, antecedent controls presence capacity are first-order contemporary processes system. Work required test whether will hold future, with more episodes predicted occur region under future climate change.