qtVlm: "maximum waves height" vs "maximum combined waves height"

[psousa]

I'm using qtVlm to do some weather routing and I would love to know the difference between these two columns on the route comparison matrix

Also, I know how to request "maximum combined waves height" on the GRIB files from @saildocs (code: WAVES code), but I don't know howto to request the the "maximum waves height" (so, I always have this column empty on the comparison matrix). Any tip?

ty

 

[Roberto]

Re: qtVlm: "maximum waves height" vs "maximum combined waves height"

I'm using qtVlm to do some weather routing and I would love to know the difference between these two columns on the route comparison matrix

Also, I know how to request "maximum combined waves height" on the GRIB files from @saildocs (code: WAVES code), but I don't know howto to request the the "maximum waves height" (so, I always have this column empty on the comparison matrix). Any tip?

ty

I do not use qtvlm so I do not know their definitions, however:
1) WAVES parameter in saildocs gives the significant wave height of the full spectrum, which I think qtvlm calls "combined"
2) saildocs allows you to request the wind wave height (so just the wind wave component, net of swell), but you must specify WW3 as model and "WVHGT" as parameter in the query command line
3) other values are available from the model, namely SWELL, or PERPW, DIRPW for period and direction of Primary Waves, then Secondary, etc, though I do not know until which order they are made available by saildocs

There is no direct model output for "maximum" waves, so maybe qtvlm uses some conversions (?) careful as differences exist depending on the type of theoretical spectrum hypothesis (check "jonswap spectrum" for some discussions)

 

[psousa]

Re: qtVlm: "maximum waves height" vs "maximum combined waves height"

ty!