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Oceanweather Inc. (OWI) "WIN" and "PRE" file formats as supported in ADCIRC
NWS12 uses the fort.22 file as a control file because the OWI format supports individual files for wind and pressure inputs as well as multiple grid overlays of varying resolutions.
NWSET NWBS DWM <...>
- NWSET is the number of nested grid overlays
- NWBS is the number of "blank" (constant 0 m/s wind speed and 1013mb pressure) timesteps to insert
- DWM is a wind multiplier to modify the wind speed magnitudes. Generally this should be set to 1 if using inputs sourced from OWI or if winds can be considered "marine exposure", with an averaging period between 10-min and 3-hrs at a height of 10 meters.
Winds and pressure data formats are similar. The header format is the same, but in the wind file the header is followed by U then V components while in the pressure file the header is followed by just pressures.
The file begins with a header indicating the starting and ending dates and is followed by a grid/date header for each time step and the u and v components of the wind in meters/second or pressures in millibars. Starting/Ending dates are in YYYYMMDDHH format where:
YYYY 4-character Year MM 2-character Month DD 2-character Day HH 2-character Hour
OWI WWS Wind Output Ucomp,Vcomp in m/s Start:1995060600 End:1995060600 iLat= 67iLong= 67DX= 1.250DY= .833SWLat= 22.500SWlon= -82.500Dt=199506060000 -1.16856 -1.06439 -.84875 -1.03460 -1.50047 -2.09462 -2.80243 -3.55863 -4.24125 -4.84273 -5.59486 -5.37088 -5.30224 -5.12534 -4.89537 -4.67412 -4.49203 -4.35772 -4.26612 -4.20260 -4.14746 -4.08396 -4.00686 -3.92213 -3.83615 -3.74765 -3.65182 -3.54998 -3.45299 -3.37660 -3.32959 -3.28037 -3.10631 -2.67723 -2.08363 -1.53773 -1.12623 -.83526 -.62870 -.47371 [rest deleted]
- iLat is the number of parallels
- iLong is the number of meridions
- DX is the grid spacing in degrees of longitude
- DY is the grid spacing in degrees of latitude
- SWLat is the latitude of the South West corner
- SWlon is the longitude of the South West corner
- Dt is the date/time in YYYYMMDDHHmm (same as master header date format but with mm Minutes as well)
The number of grid points is iLat*iLong, the u component of the winds in meters/second is followed by the v component.
Sample fortran to read a win file (first time step only):
c Read in begining/ending dates of win file 10 format (t56,i10,t71,i10) read (20,10) date1,date2
c Read Grid Specifications/Date 11 format (t6,i4,t16,i4,t23,f6.0,t32,f6.0,t44,f8.0,t58,f8.0,t69,i10,i2) read (20,11) iLat, iLong, dx, dy, swlat, swlong, lCYMDH, iMin
c Read U/V Components of the wind 12 format (8f10.0) read (20,12) ((uu(i,j),i=1,ilong),j=1,ilat) read (20,12) ((vv(i,j),i=1,ilong),j=1,ilat)
Latitude and Longitude for each point can be calculated as follows:
do 20 icnt = 1,iLat slat(icnt) = SWlat + (icnt - 1) * DY 20 continue
do 30 jcnt = 1,iLong slon(jcnt) = SWlong + (jcnt - 1) * DX 30 continue