Advantages and practicality of using a 2D hydrodynamic model in comparison to a 1D hydrodynamic model in a flood prone area

Cox, Jeremy Neil (2010) Advantages and practicality of using a 2D hydrodynamic model in comparison to a 1D hydrodynamic model in a flood prone area. [USQ Project] (Unpublished)

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Abstract

[Abstract]: This project investigates the advantages and practicality of using a 2D hydrodynamic model in comparison with a 1D hydrodynamic model for a flood plain area within Southern Queensland. The project aims to make progress towards determining when a 2D hydrodynamic is necessary and when a 1D hydrodynamic model would suffice. Three hydrodynamic models were created for an effective comparison, a simple 1D model, a refined 1D model and a 2D model. The chosen location for the project was a 43 hectare flat site subject to flooding from multiple sources including the downstream Mooloolah River. Flooding was only considered in this project from the local upstream catchment. Flows for the models were generated using the RAFTS runoff-routing software package. The 1D hydrodynamic modelling was undertaken using the MIKE11 river and creek system hydrodynamic modelling package. The TUFLOW 2-dimensional hydrodynamic floodplain software was utilised for 2D modelling. Model comparisons were analysed using the 1, 2, 5, 10, 20, 50 and 100 year Average Reoccurrence Interval (ARI) events for the local upstream catchment of the chosen site. It was found that for conditions where the flows were contained within a well defined channel, 1D hydrodynamic modelling is an effective method of representing flood characteristics. However, when flows become more complex 2D hydrodynamic modelling provides a more complete indication of flooding extents and other characteristics. A significant finding of the project was the tendency for instabilities in the 1D model when there are multiple branches in close proximity to each other.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 15 Apr 2011 05:02
Last Modified: 15 Apr 2011 05:02
Uncontrolled Keywords: floods; imagery; landscape metrics; hydrodynamics; Mooloolah River, Queensland
Fields of Research (FOR2008): 09 Engineering > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling
09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
URI: http://eprints.usq.edu.au/id/eprint/18933

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