Re: [swanmodel-users] WU DRAG parametrisation for gridded input wind data

[Rafael G. <raf...@ya...>]

 Actually in the latest swan version it should be part of the WIND command:
WIND DRAG WU
    On Saturday, 5 March 2022, 11:35:16 am NZDT, Rafael Guedes <raf...@ya...> wrote:  
 
  Hi Anna,
try:
DRAG WU

Note WU will not be applied if you are using ST6 physics.
>From past experience, ERA5 can underestimate high wind speeds in certain regions so perhaps useful to also try it with CFSR.
Rafael
    On Friday, 4 March 2022, 10:51:27 pm NZDT, Anna Adell via swanmodel-users <swa...@li...> wrote:  
 
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Hi, 
 
  
 
I am doing some simulations in SWAN and suspect that large input wind speeds are reduced too much which gives a bad fit for storm waves. Hence I wanted to test a different parametrisation for the drag coefficient. Is it possible to apply wind drag according to WU, 1982 when simulating gridded input wind data? Which keywords should I then use?
 
  
 
Here is an example to how I input my wind file with data originating from ERA5 reanalysis dataset:
 
$*** Wind
 
INPGRID WIND REG 2.5 53 0 118 36 0.25 0.25 NONSTAT 20201220.0000 3 HR
 
READ WIND 1 '../swan_wind_storm.dat' 1 1 1 1 FREE
 
  
 
Thanks in advance!
 
  
 
Best regards,
 
Anna Adell
 
PhD Student
 
Lund University
 
Dept. of Water Resources Engineering
 
www.tvrl.lth.se
 
  
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