Flood inundation mapping using hydraulic modelling and GIS: a case study in the West Creek sub-catchment

Sahib, Basheer and Liu, Xiaoye and McDougall, Kevin (2014) Flood inundation mapping using hydraulic modelling and GIS: a case study in the West Creek sub-catchment. In: 3rd National Conference on Urban Water Management: Storm water 2014 , 13-17 Oct 2014, Adelaide, South Australia.

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Abstract

In recent years, climate change has caused extreme climate conditions. This intensifies and increases the amount of rainfall that caused floods in many regions of the world. The recent floods in Queensland, Australia provide evidence of the effects of increased climate change to the state and its population. The flash flood that occurred on the 10th of January 2011 in the West Creek catchment in the City of Toowoomba was a sudden and unexpected event making it difficult to implement flood mitigating/preventive measures. To reduce the impact of flood damage, this study aimed to develop an improved flood inundation model in the part of West Creek catchment using Geographic information systems (GIS) and the HEC-RAS hydraulic model. A digital elevation model (DEM) derived from LiDAR data was the primary data source for flood modelling. The geometric data (e.g. stream centreline, banks, flow path centreline and cross-sections, etc.) were extracted from the DEM and used in the analysis. A high resolution satellite image was used to classify land cover. Roughness coefficients were assigned according to different land cover types. Field measurements were also conducted to support the modelling process. These include measuring culverts, stream cross-sections, etc. The result was flood inundation map that clearly shows the spatial extent of the flooded area along part of West Creek and lower elevation areas within the catchment.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: No evidence of copyright restrictions preventing deposit.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 26 Jun 2015 05:07
Last Modified: 16 Feb 2017 04:12
Uncontrolled Keywords: flood inundation modeling; Toowoomba
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective: D Environment > 96 Environment > 9603 Climate and Climate Change > 960302 Climate Change Mitigation Strategies
D Environment > 96 Environment > 9603 Climate and Climate Change > 960303 Climate Change Models
URI: http://eprints.usq.edu.au/id/eprint/27372

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