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Tsunami Inundation Scour of Roadways, Bridges and Foundations: Observations and Technical Guidance from the Great Sumatra Andaman Tsunami

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Available for free download at https://www.eeri.org/products-publications/free-publications-and-reports/professional-fellowship-reports/

By Mathew Francis. Francis investigates evidence of scour damage from the 2004 great tsunami, focusing upon site observations and their reflections upon current scour theory. He presents basic distinctions of criteria between well-established scour methods, such as river and tidal scour, and two tsunami scour evaluation methods (Coastal Construction Manual by FEMA and Liquefaction Enhanced Scour by Yeh and Tonkin). This report validates the potential for liquefaction enhancement of tsunami scour using the Yeh and Tonkin method. Francis observes that contradictions remain from the tsunami scour observations and analysis. Most notable is the rarity of scour depths greater than two meters among a broad range of flow depths and site conditions. Francis concludes that significant research questions remain in the evolving multidisciplinary field of tsunami engineering.

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