Re: [swanmodel-users] ERA5 input to SWAN

[João A. <ja...@au...>]

Dear Valeria,

If your SWAN input is based on bulk parameters, i.e., Hs, Tp, Dir and
Dspread, for one or more partitions, you won't be able to add more than one
spectral peak to your simulation. As Nicolas suggested, the 2D spectrum
would be the ideal input for multimodal wave spectra.

SWAN can read 2D wave spectra with the commands BOUNDNEST1 (coarse SWAN
run), BOUNDNEST2 (WAN output) and BOUNDNEST3 (WW3 output).

If you are working with partitioned data, you will need to reconstruct the
2D spectra, which can be done with the pyswan and pywafo python libraries.
Another library worth trying has been recently developed by Metocean
Solutions:
https://www.metocean.co.nz/news/2018/4/12/new-open-source-library-for-processing-ocean-wave-spectra

Best,
João

On Thu, 11 Jun 2020 at 02:46, Nicolas De Assis Bose <bos...@gm...>
wrote:

> Hello Valeria,
>
> In this case, directional wave spectrum seems more correct to be used as
> lateral boundary. Since it will represente the multi-modal sea state of
> your region.
>
> Currently, I and other friends are developing an article that explores
> this problem. We are using 3 lateral boundary database, which are WW3/NOAA
> waves parameters (Hs,Dp and Tp), ERA5 2D spectrum and CSIRO 2D spectrum.
> Both 2D spectrum were generate from waves partition, which contain the
> necessary information to generate de 2D spectrum: Hs, Tp, Dm and
> Directional spread.
>
> Preliminary results show that the SWAN wave model performs better when
> using the boundary conditions of ERA5.
>
> Best regards
>
> Nicolas Bose
>
> > On 10 Jun 2020, at 07:15, Valeria Fanti <val...@gm...>
> wrote:
> >
> > Dear users,
> > I would like to know how to deal with areas with double peaked wave
> spectra in SWAN. Is there anyway to keep on using as input values
> significant wave height, mean/peak period and peak direction but instead of
> e.g. JONSWAP using a double peaked spectra? Or the only way it to use as
> inputs the 2D wave spectral data?
> > Also, is there anybody using input data from ERA5 database I could speak
> with?
> >
> > Thanks in advance for any help or suggestion,
> > Valeria Fanti
> > _______________________________________________
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> > https://lists.sourceforge.net/lists/listinfo/swanmodel-users
>
>
>
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-- 
João Claudio Albuquerque
PhD. Candidate, School of Environment, The University of Auckland,
Level 4, Room 449, Science Centre, 23 Symonds Street, Auckland, NZ.
+64 021 02365705