TELEMAC-MASCARET Forum: Significant waveheight increase due to decrease in spread (1/1)

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TOPIC: Significant waveheight increase due to decrease in spread

Significant waveheight increase due to decrease in spread 6 years 5 months ago #30272

joreb

Hi everyone

I am currently running a simple model where I adjusted the spread via the use of "BOUNDARY DIRECTIONAL SPREAD 1". When my "BOUNDARY SIGNIFICANT WAVE HEIGHT" equals 1 and I run the simulation I get a boundary wave height which is a lot higher than 1 depending on which spread I use.

Any explanations for this phenomenon?
The steering, bottom and boundary file are found in attachment.

Kind regards

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Significant waveheight increase due to decrease in spread 6 years 5 months ago #30274

Leballeur
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openTELEMAC Guru
Posts: 434
Thank you received: 163

Hi,

Directional spreading is also related to the number of directions you're using to discretize your spectrum. The default value is 12 directional bins of 360/12=30°, which must probably be insufficient to represent the very narrow directional spreading you ask for (less than 1 degree you mention in your steering file). Try to increase the number of directions and keep in mind that the directional spreading you're prescribing is really very narrow.

Regards,
Laurent

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