Conceptual view of reflection and transmission of a tsunami wave at a step in bathymetry

Heron, Mal, and Dzvonkovskaya, Anna (2015) Conceptual view of reflection and transmission of a tsunami wave at a step in bathymetry. In: Proceedings of the Oceans '15 Conference. From: Oceans 15 MTS/IEEE, 19-22 October 2015, Washington, DC, USA.

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Recently published data from a WERA phased array radar operating in Chile after the Great Tohuku Earthquake in 2011 show that the tsunami lost a significant amount of energy as it shoaled towards the coast. This experimental result was contrary to that from the linear theory often used to estimate amplitude growth during shoaling. This paper evaluates the reflection of energy from a bathymetric step that might represent the edge of a continental shelf. A geometric wave approach is used to evaluate coefficients of reflection and transmission at the refractive index boundary. It is shown that reflection can explain some, but not all of the difference between linear theory and observations.

Item ID: 43928
Item Type: Conference Item (Presentation)
ISBN: 978-0-933957-43-5
Keywords: coastal impact; continental shelf; reflection coefficient; transmission coeffiient; tsunami
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Date Deposited: 06 Nov 2017 03:00
FoR Codes: 04 EARTH SCIENCES > 0405 Oceanography > 040503 Physical Oceanography @ 100%
SEO Codes: 96 ENVIRONMENT > 9610 Natural Hazards > 961006 Natural Hazards in Marine Environments @ 100%
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