The Pattern Method for incorporating tidal uncertainty into probabilistic tsunami hazard assessment (PTHA)
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In this paper, we describe a general framework for incorporating tidal uncertainty into probabilistic tsunami hazard assessment and propose the Pattern Method and a simpler special case called the \(\Delta t\) Method as effective approaches. The general framework also covers the method developed by Mofjeld et al. (J Atmos Ocean Technol 24(1):117–123, 2007) that was used for the 2009 Seaside, Oregon probabilistic study by González et al. (J Geophys Res 114(C11):023, 2009). We show that the Pattern Method is superior to past approaches because it takes advantage of our ability to run the tsunami simulation at multiple tide stages and uses the time history of flow depth at strategic gauge locations to infer the temporal pattern of waves that is unique to each tsunami source. Combining these patterns with knowledge of the tide cycle at a particular location improves the ability to estimate the probability that a wave will arrive at a time when the tidal stage is sufficiently large that a quantity of interest such as the maximum flow depth exceeds a specified level. Python scripts to accompany this paper are available at DOI 10.5281/zenodo.12406.
KeywordsPTHA Hazard curves 100-yr flood GeoClaw Probabilistic tidal uncertainty
Mathematics Subject Classification86-08
This work was done as a Pilot Study funded by BakerAECOM. Partial funding was also provided by NSF Grants DMS-0914942 and DMS-1216732 of the second author and involvement of the second and third authors in NSF Hazards SEES project EAR-1331412.
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