You can use wind data if you don't have any offshore wave data...Various open sources provide wind data. You can give the specification of the input wind file according to the MIKE manual 

Running DHI MIKE SW with default set up parameters and using ECMWF ERA Interim wind data set as the forcing mechanism of the model will give you good estimations of nearshore wave climate.

Can you please explain that, how to data extracted in "ECMWF ERA Interim wind data" in a particular domain.

Having registered to ECMWF wensite, you can follow this link to download wind data:

http://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=sfc/

You must select the required date and then select 0,6,12,18 as time and 0 as step. And choose 10 metre U & V wind component.

In the next step it asks you to select grid resolution and geographical extent.

Having registered to ECMWF wensite, you can follow this link to download wind data:

http://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=sfc/

You must select the required date and then select 0,6,12,18 as time and 0 as step. And choose 10 metre U & V wind component.

In the next step it asks you to select grid resolution and geographical extent.

Thank you Mostafa

One more query you have to clear me, how can i insert or convert the wind datasets to add the Mike21.

Thanks for an advance.

You can export a sample .dfs2 file to ASCII to see the structure of header, body, etc.

Something like this:

--------------------------------

"Title" "File Title"

"Dim" 2

"Geo" "LONG/LAT" 46 36 0

"Time" "EqudistantTimeAxis" "2015-01-01" "00:00:00" 848 21600

"NoGridPoints" 73 97

"Spacing" 0.125 0.125

"NoStaticItems" 0

"NoDynamicItems" 3

"Item" "u" "Wind speed" "m/s"

"Item" "v" "Wind speed" "m/s"

"Item" "mslp" "Pressure" "hectoPascal"

NoCustomBlocks 1

"M21_Misc" 1 7 0 -1E-030 -900 -99 -1E-030 -1E-030 -1E-030

"Delete" -1E-030

"DataType" 0

"tstep" 0 "item" 1 "layer" 0

2.652323 2.653296 2.673731 2.694167 2.715089 2.735525 2.755961 2.776396 2.797319 2.801698 2.798292 2.795372 2.791966 2.788561 2.785641 2.782235 2.778829 2.771531 2.763746 2.756447 2.749149 2.741850 2.734065 2.726767 2.712657 2.684922 2.657675 2.629941 2.602207 2.574472 2.546738 2.519491 2.484945 2.446993 2.409041 2.371575 2.333623 2.295671 2.257719 2.219767 2.215388 2.211982 2.209063 2.205657 2.202251 2.199332 2.195926 2.200305 2.224633 2.248961 2.273289 2.297618 2.321946 2.346274 2.370602 2.404662 2.445533 2.485918 2.526789 2.567174 2.608045 2.648917 2.689302 2.753528 2.819701 2.885873 2.952046 3.018219 3.084878 3.151051 3.219656 3.297020 3.373897

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Write your code via MATLAB/FORTRAN or any program languages you're able to use

Thank you for you suggestion.I will try.