Impacts of climate and land-use changes on floods in an urban catchment in southeast Queensland, Australia

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Author(s)
Chen, Yi-Ru
Yu, Bofu
Griffith University Author(s)
Year published
2013
Metadata
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Over the coming decades, the projected land-use change, when coupled with climate change, could potentially lead to an increased risk of flooding in urban catchments. This research aims to examine impacts of climate and land-use changes on floods in southeast Queensland, Australia. A rainfall-runoff routing model, RORB, was first calibrated and validated using observed flood hydrographs for an urbanised catchment, the Bulimba Creek catchment, for the period 1961-1990. The validated flood model was then used to generate flood hydrographs using projected rainfall based on a global climate model, GFDL, and a regional climate ...
View more >Over the coming decades, the projected land-use change, when coupled with climate change, could potentially lead to an increased risk of flooding in urban catchments. This research aims to examine impacts of climate and land-use changes on floods in southeast Queensland, Australia. A rainfall-runoff routing model, RORB, was first calibrated and validated using observed flood hydrographs for an urbanised catchment, the Bulimba Creek catchment, for the period 1961-1990. The validated flood model was then used to generate flood hydrographs using projected rainfall based on a global climate model, GFDL, and a regional climate model, CCAM, for 2016-2045. Projected daily precipitations for the two contrasting periods were used to derive adjustment factors for a given frequency of occurrence. Two scenarios of land-use change were considered to evaluate the likely impact of land-use change. Results showed that future flood magnitudes are unlikely to increase for large flood events for the urban catchment. Further, land-use change would not significantly affect flood magnitudes for a given frequency of occurrence in the urbanised catchment.
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View more >Over the coming decades, the projected land-use change, when coupled with climate change, could potentially lead to an increased risk of flooding in urban catchments. This research aims to examine impacts of climate and land-use changes on floods in southeast Queensland, Australia. A rainfall-runoff routing model, RORB, was first calibrated and validated using observed flood hydrographs for an urbanised catchment, the Bulimba Creek catchment, for the period 1961-1990. The validated flood model was then used to generate flood hydrographs using projected rainfall based on a global climate model, GFDL, and a regional climate model, CCAM, for 2016-2045. Projected daily precipitations for the two contrasting periods were used to derive adjustment factors for a given frequency of occurrence. Two scenarios of land-use change were considered to evaluate the likely impact of land-use change. Results showed that future flood magnitudes are unlikely to increase for large flood events for the urban catchment. Further, land-use change would not significantly affect flood magnitudes for a given frequency of occurrence in the urbanised catchment.
View less >
Conference Title
CLIMATE AND LAND SURFACE CHANGES IN HYDROLOGY
Volume
359
Publisher URI
Copyright Statement
© 2013 IAHS. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the conference's website for access to the definitive, published version.
Subject
Environmental Engineering Modelling