Wind input files
At present, for different wind input files, different headers are used, which are read in different ways in the sourcecode. Some effeort has been put to in making the files more self-descriptive, readible and to make the input of the different files more consistent. For three wind-input options, a suggestion to standardise the headers is shown below. The suggestion is conform the possible transition NetCDF format in the future. See NetCDF standard names for more information on the used standard NetCDF names. Further below (in section: Integrated standardisation), an integrated file format is proposed which can be used for all wind input options. Comments are indicated by a # (this is open for discussion).
- The Pseudo ArcInfo wind input file, with keyword in MD-file Filwp
# START OF HEADER # This file is created by Deltares n_cols = 201 n_rows = 173 x0 = -12.000 y0 = 48.000 value_pos = centre #value_pos = corner cellsize = 0.12500 0.083333333 x_unit = degree #x_unit = m t_ref = 20080312.000000 t_ref_unit = ModifiedJulianDate t_unit = hrs #t_unit = ModifiedJulianDate n_quantity = 3 quantity = x_wind y_wind air_pressure unit = m s-1 m s-1 Pa missing_value = -999.000 # END OF HEADER TIME = 0.0 1000.776001 1000.687927 1000.599976 1000.512024 1000.423950 1000.334961 1000.245911 1000.156921 1000.067932 TIME = 120.0 1000.786001 1000.637927 1000.579976 1000.582024 1000.424950 1000.324961 1000.265911 1000.159921 1000.060932
- The wind on a curvi-linear grid input file, with keyword in MD-file Fwndgp
# START OF HEADER # This file is created by Deltares grid_file = hirlam.grd first_row = nmax last_row = 1 first_col = 1 last_col = mmax t_ref = 20080312.000000 t_ref_unit = ModifiedJulianDate t_unit = hrs n_quantity = 1 quantity = air_pressure unit = Pa missing_value = -999.0 # END OF HEADER TIME = 2130 101894.125 101880.625 101867.125 101853.625 101840.625 101827.125 101813.125 101798.625 101784.625 101769.625 101754.125 101739.125 101723.625 TIME = 2273.0 100038.75 100037.25 100035.75 100035.25 100035.25 100035.25 100036.5 100038.0 100039.75 100042.25 100045.0 100048.0 100052.0 100056.0 100060.0
- The Spiderweb wind input file, with keyword in MD-file Filweb
# START OF HEADER # This file is created by Deltares # Spiders web derived from TRACK file: 19991026_0000.imd # Wind direction winddir = where it blows from, degrees from true north n_cols = 400 n_rows = 16 radius = 600000.00 rad_unit = m x_unit = degree #x_unit = m t_ref = 19991026.000000 t_ref_unit = ModifiedJulianDate t_unit = min #t_unit = hrs n_quantity = 3 quantity = wind_speed wind_from_direction p_drop unit = m s-1 degree Pa missing_value = -999.000 # END OF HEADER TIME = 0.0000000E+00 x0 = 115.4 y0 = 18.9 p_drop_eye = -5300 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 155.0000 346.2500 357.5000 8.750000 20.00000 31.25000 42.50000 53.75000 65.00000 76.25000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 TIME = 1440 x0 = 114.4000 y0 = 18.90000 p_drop_eye = -5300.000 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 65.01978 75.11859 85.25320 95.45370 105.7529 116.1833 126.7762 137.5612 148.5649 159.8090 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544
Integrated standardisation
An integrated file format, suitable for all wind input, might look as follows:
# START OF HEADER # This file is created by Deltares # Additional commments # General part: t_ref = 19991026.000000 # Reference time t_ref_unit = ModifiedJulianDate # Unit used for reference time t_unit = min # Time unit (sec, min, hrs, etc.) #t_unit = hrs missing_value = -999.000 # Value used for undefined or missing data # For Pseudo ArcInfo or Spiderweb wind: n_cols = 400 # Number of columns used for wind datafield n_rows = 16 # Number of rows used for wind datafield x_unit = degree # Unit of distances on the grid #x_unit = m # Only for Pseudo ArcInfo wind: x0 = -12.000 # Xcoordinate of starting point of grid (in units specified in x_unit) y0 = 48.000 # Ycoordinate of starting point of grid (in units specified in x_unit) value_pos = centre # Location where the data is specified in a cell (centre or corner) #value_pos = corner cell_size = 0.12500 0.083333333 # Grid dimensions: dx and dy (in units specified in x_unit) n_quantity = 3 # Number of quantities prescribed in the file quantity = x_wind y_wind air_pressure # Names of the quantities unit = m s-1 m s-1 Pa # Units of the quantities # Only for Spiderweb wind: radius = 600000.00 # Radius of spiderweb (in units specified in rad_unit) rad_unit = m # Unit of radius n_quantity = 3 # Number of quantities prescribed in the file quantity = wind_speed wind_from_direction p_drop # Names of the quantities unit = m s-1 degree Pa # Units of the quantities # Only for wind on a separate curvi-linear grid: grid_file = hirlam.grd # Separate (curvi-linear) grid on which the wind can be specified first_row = nmax # These four parameters determine the order in which the data last_row = 1 # is read from the separate wind file. In this way, data which is first_col = 1 # supplied in a reversed order, can also be read. last_col = mmax n_quantity = 1 # Number of quantities prescribed in the file quantity = air_pressure # Names of the quantities unit = Pa # Units of the quantities # END OF HEADER TIME = 0.0000000E+00 # Time where first dataset is supplied # Only for Spiderweb wind (every TIME input): x0 = 115.4 # Xcoordinate of cyclone eye (Spiderweb centre) at specified TIME y0 = 18.9 # Ycoordinate of cyclone eye (Spiderweb centre) at specified TIME p_drop_eye = 5300 # Pressure drop at cyclone eye (Spiderweb centre) at specified TIME # Actual data field 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 1.388999 155.0000 346.2500 357.5000 8.750000 20.00000 31.25000 42.50000 53.75000 65.00000 76.25000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 5300.000 TIME = 1440 # Time where next dataset is supplied x0 = 114.4000 # Xcoordinate of cyclone eye (Spiderweb centre) at specified TIME y0 = 18.90000 # Ycoordinate of cyclone eye (Spiderweb centre) at specified TIME p_drop_eye = 5300.000 # Pressure drop at cyclone eye (Spiderweb centre) at specified TIME 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 2.435253 65.01978 75.11859 85.25320 95.45370 105.7529 116.1833 126.7762 137.5612 148.5649 159.8090 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544 5298.544
