$ -------------------------------------------------------------------- $ $ WAVEWATCH III Update Restart input file $ $ -------------------------------------------------------------------- $ $ $ $ Time of Assimilation ----------------------------------------------- $ $ - Starting time in yyyymmdd hhmmss format. $ $ $ $ This is the assimilation starting time and has to be the same with $ $ the time at the restart.ww3. $ $ $ 19680607 120000 $ $ $ $ Choose algorithm to update restart file $ $ UPDN for the Nth approach $ $ -------------------------------------------------------------------- $ $ The UPDN*, with N<2 the same correction factor is applied at all $ $ the grid points using: $ $ PRCNTG is input for option UPD0F and is the correction $ $ factor applied to all the gridpoints (e.g. 1.) $ $ $ $ UPD0C:: ELIMINATED $ $ UPDOF:: Option 0F All the spectra are updated with a constant $ $ fac=HsAnl/HsBckg. $ $ Expected input: PRCNTG, as defined at fac $ $ UPD1 :: ELIMINATED $ $ -------------------------------------------------------------------- $ $ UPD0F $ 0.6754 $ $ $ -------------------------------------------------------------------- $ $ UPDN, with N>1 each gridpoint has its own update factor and uses: $ $ PRCNTG_CAP - global input for option UPD2+ and is a cap on $ $ the maximum SWH correction factor applied to all the $ $ gridpoints, as both a multiple or divisor (e.g. cap at 5.0 $ $ means SWHANL/SWHBKG<=5.0 and SWHANL/SWHBKG>=0.2). The value $ $ given should not be less than 1.0 $ $ Name of the file with the SWH analysis from the DA system $ $ suffix .grbtxt for text out of grib2 file. $ $ $ UPD2 :: Option 2 The fac(x,y,frq,theta), is calculated at each $ $ grid point according to HsBckg and HsAnl $ $ Expected input the Analysis field, grbtxt format $ $ UPD3 :: Option 3 The update factor is a surface with the shape $ $ of the background spectrum. $ $ Expected input: the Analysis field, grbtxt format and cap $ $ for the last gross check. $ $ UPD4 :: [NOT INCLUDED in this Version, Just keeping the spot] $ $ Option 4 The generalization of the UPD3. The update $ $ factor is the sum of surfaces which are applied on the $ $ background spectrum. $ $ The algorithm requires the mapping of each partition on the $ $ individual spectra; the map is used to determine the $ $ weighting surfaces. $ $ Expected input: the Analysis field, grbtxt format and the $ $ functions(frq,theta) of the update to be applied. $ $ -------------------------------------------------------------------- $ UPD2 10.0 anl.grbtxt $ $ $ -------------------------------------------------------------------- $ $ UPDN, with N>=5 each gridpoint has its own update factor and uses $ $ wind field data to evaluate wind-sea and swell fields. Also $ $ uses: $ $ PRCNTG_CAP - see above $ $ THRWSEA - energy threshold (SWH_WS**2/SWH**2) above which the $ $ sea-state is considered wind-sea dominated by the DA scheme $ $ Name of the file with the SWH analysis from the DA system $ $ suffix .grbtxt for text out of grib2 file. $ $ $ $ UPD5 :: Option 5 Corrections are calculated as per UPD2 but are $ $ applied to wind-sea parts of the spectrum only when $ $ wind-sea is the dominant component, otherwise the whole $ $ spectrum is corrected $ $ Expected input: the Analysis Hs field plus background wind $ $ speed and direction $ $ UPD6 :: Option 6 Corrections are calculated as per UPD5 but $ $ wind-sea components are also shifted in frequency space $ $ using Toba (1973) $ $ Expected input: the Analysis Hs field plus background wind $ $ speed and direction $ $ -------------------------------------------------------------------- $ $ UPD6 $ 10.0 0.7 $ anl.grbtxt $ $ $ -------------------------------------------------------------------- $ $ WAVEWATCH III EoF ww3_uprstr.inp $ $ -------------------------------------------------------------------- $