Southeast Queensland storm tide response to ex tropical cyclone Oswald

Smith, Mitchell (2015) Southeast Queensland storm tide response to ex tropical cyclone Oswald. [USQ Project]

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Abstract

Although a significant body of work exists, previous storm tide studies within Moreton Bay have consistently underestimated observed peak tide gauge levels by up to 40%. There remains scientific debate regarding the source of this 'missing' contribution, which is hypothesised to be resultant from either disturbance of regional oceanic density structure, wave radiation stress gradients due to wave breaking on the Spitfire Banks or the need to improve the current parameterisation of wind stress into the water column. To support or disprove these hypotheses, this study investigates the regional surge response during the passage of Ex. Tropical Cyclone Oswald in January 2013 through the application of a series of integrated hydrodynamic and spectral wave modelling experiments. Overall, the shape and magnitude of the experiments with wave radiation stresses activated provide a better match (~27% peak underestimate) to measured residuals compared with tide plus surge only experiments (~47% underestimate) supporting the theory of wave-surge interaction. During the twenty-hour period of greatest wind speeds however, there is a consistent ~25% underestimation that tends to support a call to improve the implementation of model physics at the air-sea interface, while the effects of 3D regional ocean contributions needs to be revisited when improved model boundaries are available and this aspect cannot be dismissed.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Alam, Md Jahangir
Date Deposited: 31 May 2016 23:49
Last Modified: 05 Jun 2016 23:56
Uncontrolled Keywords: Storm tide response, tropical cyclone Oswald, southeast Queensland, wave radiation stresses, hydrodynamic, spectral wave modelling
Fields of Research : 09 Engineering > 0907 Environmental Engineering > 090799 Environmental Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/29178

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