Mohid Swan
From MohidWiki
In this wiki it would be commented how to implement the Swan model into the Mohid modelling software.
Contents
Software Needed
In addition to the Mohid model it will be needed the following software to achive the goal.
For Maretequers, the software (with configuration examples) and user manuals can be found internally here
\\neptuno\Software\Swan
To get an example of the whole data pre-processing, look internally, here
\\neptuno\Software\MOHID\Mohid Swan
Bathymetry
To create a SWAN bathymetry, one may convert a MOHID bathymetry (grid data file) using the matlab script found in the \\neptuno\Software\MOHID\Mohid Swan\MohidGriddataToSWAN folder. In Matlab, select the script folder as the working directory then type at the matlab prompt:
> MohidBatim2SWAN.m
Then follow the GUI instructions. It should create a SWAN bathymetry file (.sty).
The bathymetry should be visualised using notepad or a software called sigma that needs to be localed in the root directory c:\
Sigma -> Task File -> Show so far -> Linha CGWID
Boundary Conditions
The Swan model would need of wind, tide and deep-Ocean swell as boundary conditions.
Wind
Wind vectors should also be provided from other model results (i.e. MOHID, MM5 or WRF) and then converted to the SWAN format using ConvertToHDF5 using the option "ConvertHDF5ToSWANorMOHID" that will provide a hourly file with values for x and y directions, be aware of the file size.
One way to extract winds to force the SWAN, is to use the wind velocity present in the Atmosphere_x.hdf5 file, coming from a 2D MOHID simulation pre-made for the study region.
An alternative way is to use MM5 HDF5 Mohid results and then glue and interpolate them to the MOHID model(s) grid(s) (which is(are) the same as SWAN's). To perform standard glue and interpolate operations with ConvertToHDF5, please refer to the ConvertToHDF5 wiki ...
ConvertToHDF5 configuration
Here's the ConvertToHdf5 configuration file ConvertToHDF5Action.dat for the action CONVERT FROM HDF5 TO SWAN OR MOHID to use (notice that there are two beginfile/endfile blocks, one for X direction, and another for the Y direction):
<begin_file> ACTION : CONVERT FROM HDF5 TO SWAN OR MOHID INPUTFILENAME : Atmosphere_1.hdf5 INPUT_GRID_FILENAME : ../../Batim/MOHID/BatimSO.dat <<beginproperty>> wind velocity X <<endproperty>> START : 2011 04 04 0 0 0 END : 2011 04 07 0 0 0 OUTPUT_TIME : 0 3600 OUTPUT_OPTION : 1 <end_file> <begin_file> ACTION : CONVERT FROM HDF5 TO SWAN OR MOHID INPUTFILENAME : Atmosphere_1.hdf5 INPUT_GRID_FILENAME : ../../Batim/MOHID/BatimSO.dat <<beginproperty>> wind velocity Y <<endproperty>> START : 2011 04 04 0 0 0 END : 2011 04 07 0 0 0 OUTPUT_TIME : 0 3600 OUTPUT_OPTION : 1 <end_file>
Note that this configuration will produce hourly outputs.
Troubleshoot
Q: The conversion won't work or the SWAN model won't run because of the winds.
A: The Atmosphere_x.hdf5 of the MOHID results needs to be edited and changed (using HDFView). 1 - The MappingPoints2D data needs to be renamed to WaterPoints in the GRID/ group. 2 - The first instant of Time is could be wrong; it could display an offset of one dt. The time instant data should be edited and the offset should be removed. Example: Once, the first time instant in the HDF5 atmosphere_x file would read 2006 10 15 17 00 20 when it should read instead 2006 10 15 17 00 00.
Tide
The tide sould be obtained from other models (i.e. PCOMS), or calculated (i.e. Tideprev) and interpolated to the grid.
Swell
SWAN Model Input
Sect 3 CGRID is the origin, starting from the lower left corner 0 -> Rotation (0 no inclination) 1.3 -> Grid step x in degrees 2 -> Grid step y in degrees 130 -> cells -1 in X direction 200 -> cells -1 in Y direction CIR -> Whole circle of directions 36 -> Number of directions 0.04 -> Minimum frequency 0.5 -> Maximum frequency 50 -> Number of frequencies -1 (in total then 51)
Sect 4 Equal to Sect 3 but dx = 0.01 = dy wlevel.in wind.in
Sect 5
WavewatchIII
BOUN (boundary) SIDE W CONST PAS 5 10 210 30
H T Dir Dispersion
Sect 6 Physics Do not change
Sect 8 Time series To obtain a window it should be edited NGRID Indicating the lower left cell for the new grid, the size of the grid in x and y and the number of cells SUBG Indicates the subgrid and in should be provided the lower left corner of the father grid
Sect 10 It makes the domain 4 times and when reach the 98% probability then stops. Defines the initial and final date It should be defined a day as the initial date
Running Swan
Input and the exe file should be located in the same folder.
SWAN Model Output
To be viewed in Matlab .tbl X Y DEP HS DIR PER FOR WIND
Also can be used the ConvertToHDF5 with the option ConvertToAndFromSWAN
