Authors / CoAuthors
Horspool, N. | Neilsen, O. | Jakeman, J. | Van Putten, K. | Griffin, J.
Abstract
In response to the devastating Indian Ocean Tsunami (IOT) that occurred on 26 December 2004, Geoscience Australia developed a framework for tsunami risk modelling. The outputs from this methodology have been used by emergency managers throughout Australia to plan and prepare for future events. For Geoscience Australia to be confident in the information that is provided to the various stakeholders, validation of the model and methodology is required. Tsunami modelling at Geoscience Australia employs a hybrid approach which couples two models at the continental shelf. First we use an elastic dislocation model to simulate the initial sea-floor displacement of an earthquake source. The tsunami is then propagated across the deep ocean using URSGA, a finite difference model that solves the non-linear shallow water wave equation across nested grids. We stop this model at the 100 m water depth contour and couple it to a detailed inundation modelling tool, ANUGA, developed by Geoscience Australia and the Australian National University. ANUGA also solves the non-linear shallow water wave equation and uses a finite volume method. It incorporates bottom friction coefficients and can resolve hydraulic shocks and the wetting and drying process. While the huge loss of life from the 2004 Indian Ocean tsunami was tragic it did provide a unique opportunity to record the impact of a large tsunami event. Information gained from post-tsunami surveys and tide gauge recordings at Patong Bay, Thailand and Geraldton, Western Australia is used to validate our tsunami inundation modelling methodology. By using these two locations we can assess the performance of our models at near-source and distal locations. In addition, wave heights observed in the deep ocean from satellite altimetry are utilised to validate our deep water propagation model.
Product Type
nonGeographicDataset
eCat Id
70578
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Custodian
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
Australia
Keywords
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- External PublicationAbstract
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- tsunamis
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- numerical modelling
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- geohazards
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- marine
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2010-01-01T00:00:00
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