- Title
- A comparison of tsunami inundation model results for drowned river valleys using either static or dynamic tidal inputs
- Creator
- Wilson, Kaya M.; Kendall, Murray; Power, Hannah E.
- Relation
- Australasian Coasts & Ports 2019 Conference. Proceedings of Australasian Coasts and Ports 2019 Conference (Hobart, Tasmania 10-13 September, 2019) p. 1233-1239
- Relation
- https://www.proceedings.com/50955.html
- Publisher
- Engineers Australia
- Resource Type
- conference paper
- Date
- 2019
- Description
- Although it is common for tsunami modelling studies to apply a static tide, it is known that tsunamis and tides interact in a non-linear manner in estuaries such as drowned river valleys. Tide-tsunami interactions can both intensify and dampen the effects of tsunami depending on factors including mean basin depth. In order to demonstrate the differences between tsunami modelling with static and dynamic tides, we conducted a series of models at two New South Wales (NSW) drowned river valley locations, Sydney Harbour and Port Hacking. Boundary conditions used a wave train sourced from the T2 database to represent a tsunami sourced from a MW 9.0 earthquake at the Puysegur trench near New Zealand. The tsunami was then phased with a spring tide. Fourteen distinct dynamically tided scenarios were created by positioning the largest tsunami wave peak at hourly intervals across a complete tidal range. For every tidal stage coincident with the peak of the largest tsunami wave, the tidal level was extracted and used as a static tide level for static tide models. Direct comparisons could then be made between models with dynamic and static tides of equivalent tidal levels. Static tide models provide a simpler tsunami model setup. However results show that they may underestimate maximum inundation volumes, and become less reliable upriver, particularly beyond locations with significant water flow constrictions. Static tide models only provide results comparable to dynamic tide models for approximately 1-2 hours from tsunami arrival.
- Subject
- tsunami; tsunami modelling; tide-tsunami interactions; SDG 11; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1435910
- Identifier
- uon:39858
- Identifier
- ISBN:9781925627237
- Language
- eng
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