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wdnotes

PURPOSE ^

WDNOTES: notes on estimating wave effects on wind measurements.

SYNOPSIS ^

This is a script file.

DESCRIPTION ^

 WDNOTES: notes on estimating wave effects on wind measurements. 
 The following set of mfiles can be used to correct the wind speed 
 Ua measured at height za for the effects of the wave boundary layer
 following the empirical model presented by Large, Morzel, and 
 Crawford (1995), J. Phys. Oceanog., 25, 2959-2971. In particular,
 an analytic expression was found for the omega function (omegalmc.m)
 shown in their Fig. 9b, which allows the 'true' wind speed (Ut10) 
 and stress at 10m (assumed above the wave boundary layer height) 
 to be computed using wavedist.m and the true wind speed (Uta) at the 
 measurement height za using wavedis1.m. The Large et al model assumes 
 neutral stability (reasonable for high winds and wave conditions) 
 and uses a 10-m neutral drag law (cdnve.m) based on Vera (1983;
 unpublished manuscript). This drag law follows Large and Pond (1982)
 for winds above 10 m/s but increases at lower wind speeds like 
 Smith (1987). The wave field is specified by the significant wave 
 height Hw.

 To compute 'true' wind speed Uta at za given Hw, use
          Uta=wavedis1(Ua,za,Hw).

 To compute 'true' wind speed Ut at 10m given Hw, use
          [Ut10,(Ut10-U10)]=wavedist(Ua,za,Hw).

 To plot the predicted effects of wave distortion on the wind Ua
    measured at the height za for a range of significant wave heights 
    Hw=[0:2:8] in m, use
          y=wavedis2(za).

 Subroutines called:  
          y=omegalmc(x)
          cd10=cdnve(u10)

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 % WDNOTES: notes on estimating wave effects on wind measurements.
0002 % The following set of mfiles can be used to correct the wind speed
0003 % Ua measured at height za for the effects of the wave boundary layer
0004 % following the empirical model presented by Large, Morzel, and
0005 % Crawford (1995), J. Phys. Oceanog., 25, 2959-2971. In particular,
0006 % an analytic expression was found for the omega function (omegalmc.m)
0007 % shown in their Fig. 9b, which allows the 'true' wind speed (Ut10)
0008 % and stress at 10m (assumed above the wave boundary layer height)
0009 % to be computed using wavedist.m and the true wind speed (Uta) at the
0010 % measurement height za using wavedis1.m. The Large et al model assumes
0011 % neutral stability (reasonable for high winds and wave conditions)
0012 % and uses a 10-m neutral drag law (cdnve.m) based on Vera (1983;
0013 % unpublished manuscript). This drag law follows Large and Pond (1982)
0014 % for winds above 10 m/s but increases at lower wind speeds like
0015 % Smith (1987). The wave field is specified by the significant wave
0016 % height Hw.
0017 %
0018 % To compute 'true' wind speed Uta at za given Hw, use
0019 %          Uta=wavedis1(Ua,za,Hw).
0020 %
0021 % To compute 'true' wind speed Ut at 10m given Hw, use
0022 %          [Ut10,(Ut10-U10)]=wavedist(Ua,za,Hw).
0023 %
0024 % To plot the predicted effects of wave distortion on the wind Ua
0025 %    measured at the height za for a range of significant wave heights
0026 %    Hw=[0:2:8] in m, use
0027 %          y=wavedis2(za).
0028 %
0029 % Subroutines called:
0030 %          y=omegalmc(x)
0031 %          cd10=cdnve(u10)
0032 
0033 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0034 % 7/28/99: version 1.1
0035 % 8/5/99: version 2.0
0036 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0037

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