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ADCIRC parameters (tau and tau0)

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When running the model I am getting the nonfatal error message:

"Typically your input value for tau0 should be set equal to tau"

And my question is how do I do that?

My wave continuity is set equal to the friction coefficient at 0.0015. As far as I understand tau is the bottom friction and tau0 is related to the wave continuity.

Austin

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When running the model I am getting the nonfatal error message:

"Typically your input value for tau0 should be set equal to tau"

And my question is how do I do that?

My wave continuity is set equal to the friction coefficient at 0.0015. As far as I understand tau is the bottom friction and tau0 is related to the wave continuity.

Austin

There is a lot of literature on this subject, but usually you want tau0 to be 1-10 times your bottom friction if memory serves me correctly. ADCIRC can calculate a spatially (and temporally if desired) variable tau0 automatically in v47. This removes the necessity to repeatedly tweak tau0. SMS doesn't support this but you can manually change the tau0 value in the fort.15 file to a specified negative number for different settings. Please see the manual at http://www.adcirc.org for the option settings.

Chris

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