LiDAR data for DEM generation and flood plain mapping

Topp, Michael James (2014) LiDAR data for DEM generation and flood plain mapping. [USQ Project]

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Abstract

On Monday 10 January 2011, a 1 in 100 year storm cell quickly developed over the Toowoomba city dumping intensive rain in a short period of time in the Gowrie Creek catchment (ICA, 2011). This caused extensive flash flooding over the entire catchment including West Creek before destroying the central business district and causing loss of life. To ensure that damage is reduced and lives are saved in the future, areas requiring mitigation need to be identified. To identify these areas characteristic analysis, slope analysis, flood plain mapping and hydrological modelling can be utilised.

To complete this highly accurate Digital Elevation models (DEM) generated from Airborne Light Detection and Ranging (LiDAR) data can be utilised. LiDAR is a surveying technology that can collect large amounts of accurate data compared to traditional survey methods. Stream networks and catchment boundaries were generated utilising Arc Hydro at multiple different thresholds.

Slope analysis was also completely highlighting the flood plain and the possible effects of urbanisation. Hydrological modelling using the Storm Water Management Model (SWMM) also showed extensive velocities and volumes with assumptions. These results showed that West Creek had extensive problems with urbanisation throughout the catchment. It also highlighted the issues with West Creek and East Creek meeting and the inability of the system to handle both creeks flood waters once they merge. To proactively mitigate floods analysis should be completed before floods occur and using the worst case flood data.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Surveying) project.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Liu, Xiaoye
Date Deposited: 09 Sep 2015 05:17
Last Modified: 08 Mar 2016 02:06
Uncontrolled Keywords: LiDAR data; ArcGIS; flood plain mapping; Toowoomba
Fields of Research : 09 Engineering > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040604 Natural Hazards
09 Engineering > 0909 Geomatic Engineering > 090903 Geospatial Information Systems
URI: http://eprints.usq.edu.au/id/eprint/27265

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