sea level in storm surge simulation

[Robina]

Hello all,

In Katrina example in storm surge simulation, we have:

 geo_data.sea_level = 0.125  # Due to seasonal swelling of gulf.

Why this number: 0.123 and not zero? and what is the source of this number?

Kind regards,

[Kyle Mandli]

This value originated from a comparison to the validation study done for ADCIRC in [1].  There is an annual bias of the tide in the gulf that is thought to at least be partly attributable to heat content in the gulf during that time of the year.  I honestly am not sure if the source of the bias is true but based on observations there is an annual component to the tide in the gulf.

Often beyond this particular case it is important to look at a comparison of datums and tidal stages for a location when doing surge modeling.  I often will look at the tidal statistics for a location and use it as a basis for setting the offset to the datum.  This is particularly important when considering sea-level rise.

1. Hope, M. E., et al. (2013), Hindcast and validation of Hurricane Ike (2008) waves, forerunner, and storm surge, J. Geophys. Res. Oceans, 118, 4424–4460, doi:10.1002/jgrc.20314.

Kyle

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[Robina]

Thank you Kyle