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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 3: Water and Carbon: Climate Change Impact : An event runoff coefficient approach for assessing changes in short-term catchment runoff following ...
An event runoff coefficient approach for assessing changes in short-term catchment runoff following bushfires
Author : K.S. Tan, D.J.M. Flower and D.M. Flowers
The February 2009 Victorian bushfires affected approximately 30% of Melbourne’s water supply catchments. Previous experience of bushfires in south-eastern Australia indicates fires can affect catchment water balances, potentially increasing short-term runoff due to reduced vegetation cover and changes in soil conditions, and reducing long-term water yield due to forest regrowth. While changes in post-fire runoff can be investigated using conceptual or physically-based catchment models, these approaches often involve modelling assumptions. uncertainties and intensive data requirements. Consequently, there is a need for rapid assessment methods requiring fewer assumptions using readily-available hydrologic observations. In this paper, an approach for comparing pre- and post-fire runoff coefficients for hydrologically-similar rainfall events (and monthly, seasonal and annual periods) is used to investigate short- and medium-term runoff changes. Results reveal mixed catchment responses, with no clear indication of increased runoff in the initial one and a half year post-2009 bushfires possibly due to the relatively low/moderate burn severity and mortality in the two Melbourne Water catchments investigated.
File Size : 432,131 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 3: Water and Carbon: Climate Change Impact
Date Published : 01/07/2011
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