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amy

Reference time in ADCIRC

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Hi,

I am a bit confused about the meaning of "Reference time" in the Simulation Time Control section in Adcirc Model Control. I will be grateful if someone can clarify me.

Thanks.

Amy

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This correlates to the REFTIM variable in the ADCIRC documentation.

From the ADCIRC website (www.adcirc.org), the description is given below:

REFTIM = reference time (in days). This is used only to compute time

for the harmonic forcing and analysis terms. A nonzero value allows

equilibrium arguments to be used that have been calculated for a time

other than TIME0 = STATIM*86400. The time used for harmonic terms is

compute as: TIMEH = (STATIM-REFTIM)*86400.+ DTDP*IT.

This is used if you extract tidal constituents at one time and then later want to run at a time a little bit before or after the time extracted. So if you want to start your run 1 day later, you would put 1.0 in this place.

Hi,

I am a bit confused about the meaning of "Reference time" in the Simulation Time Control section in Adcirc Model Control. I will be grateful if someone can clarify me.

Thanks.

Amy

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This correlates to the REFTIM variable in the ADCIRC documentation.

This is used if you extract tidal constituents at one time and then later want to run at a time a little bit before or after the time extracted. So if you want to start your run 1 day later, you would put 1.0 in this place.

Hello,

I am facing the same problem, and haven't get yet a clue about the meaning of REFTIM of the adcirc module. Here is my case:

I am using LeProvost database and my start date for the tide constituents is Oct 10th 00:00am. The duration of the simulation is 10 days, with a ramp of 5 days. I am using a meteorological forcing (wind and pressure)

as well for the same days,

which corresponds to a starting day in the adcirc model control - general window equal to 280. Now I would like to set the REFTIME to the value corresponding to the days of the simulation (from 10th to 20th Oct):

which REFTIM should I use? maybe 280, the same as the start day? or 0?

Thank you for the help

Andrea

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If you want your run to start on Oct 10th at 00:00 am, use 0.0.

The idea is that if you decide later to do a run starting on Oct 11th at 00:00 am, you can put 1.0 and not reextract the tidal constituents.

Hello,

I am facing the same problem, and haven't get yet a clue about the meaning of REFTIM of the adcirc module. Here is my case:

I am using LeProvost database and my start date for the tide constituents is Oct 10th 00:00am. The duration of the simulation is 10 days, with a ramp of 5 days. I am using a meteorological forcing (wind and pressure)

as well for the same days,

which corresponds to a starting day in the adcirc model control - general window equal to 280. Now I would like to set the REFTIME to the value corresponding to the days of the simulation (from 10th to 20th Oct):

which REFTIM should I use? maybe 280, the same as the start day? or 0?

Thank you for the help

Andrea

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