swanwaterlevelspvariedsct#

[swanwaterlevel, waterlevelpoint] = swanwaterlevelspvariedsct(xgrid, ygrid, xpoint, ypoint, waterlevel, savedata, outfilename, outfilelocation, CalcMethod)

Description#

Generate SWAN water level file for spatially varied water level from scattered input data

This function can be used for any other scalar variable as well

Inputs#

xgrid: x (longitude) of output grid points as a [M*N] array
ygrid: y (latitude) of output grid points as a [M*N] array
xpoint: x (longitude) of the location (such as meteorological station) that water level (or any scalar variable) is known in that location

as a [L] array

1st element is 1st point, 2nd element is 2nd point, 3rd element is 3rd point, …
ypoint: y (latitude) of the location (such as meteorological station) that water level (or any scalar variable) is known in that location

as a [L] array

1st element is 1st point, 2nd element is 2nd point, 3rd element is 3rd point, …
waterlevel: Water level (or any scalar variable) at (xpoint,ypoint) as a [K*L] array

K is number of time steps for a time series

1st row (i.e. [1,:]) is 1st time step, 2nd row (i.e. [2,:]) is 2nd time step, …

Example: waterlevel(1,:) is the water level data for all points at the first time step

L is number of points (such as meteorological stations) that water level (or any scalar variable) is known in those locations

L should be L>=3

1st column (i.e. [:,1]) is 1st point, 2nd column (i.e. [:,2]) is 2nd point, 3rd column (i.e. [:,3]) is 3rd point, …

Example: waterlevel(:,1) is the water level data for all time steps at the first point
savedata=’no’;: Define if save data in a file or not

‘no’: does not save

‘yes’: save data as ascii file
outfilename=’swanwaterlevel.wl’;: Name of output file between ‘ ‘ mark, example: ‘swanwaterlevel.wl’

outfilename should have ‘.wl’ extension

In case of using other scalar varable than water level, use proper name and extension
outfilelocation=pwd;: Location of output file between ‘ ‘ mark, example: ‘C:' in MATLAB, or ‘C:/’ in Python
CalcMethod=’linear’;: Interpolation method

‘linear’: Use default or ‘linear’ method to interpolate

‘nearest’: Use nearest neighbor method to interpolate

Outputs#

swanwaterlevel: Spatially varied water level data (or any scalar variable) formated for SWAN

Water level data at each time step is assigned into the grid points
waterlevelpoint: Nearest interpolated water level (or any scalar variable) at (xpoint,ypoint) as a [K*L] array

K is number of time steps for a time series

L is number of points (such as meteorological stations) that water level (or any scalar variable) is known in those locations

Examples#

[xgrid,ygrid]=meshgrid(linspace(-91,-90,100),linspace(28,30,100));
xpoint=[-90.5;-90.3;-90.7]; %Data are known at 3 locations
ypoint=[29.2;29;28.8]; %Data are known at 3 locations
waterlevel=[[0.5,0.55,0.6];[0.64,0.69,0.74];[0.7,0.75,0.8];[0.4,0.45,0.5]]; %Data for 4 time steps
savedata='no';
outfilename='swanwaterlevel.wl';
outfilelocation=pwd;
CalcMethod='linear';
[swanwaterlevel,waterlevelpoint]=swanwaterlevelspvariedsct(xgrid,ygrid,xpoint,ypoint,waterlevel,savedata,outfilename,outfilelocation,CalcMethod);


[xgrid,ygrid]=meshgrid(linspace(-91,-90,100),linspace(28,30,100));
xpoint=[-90.5;-90.3;-90.7]; %Data are known at 3 locations
ypoint=[29.2;29;28.8]; %Data are known at 3 locations
waterlevel=[0.5,0.55,0.6]; %Data for 1 time step
savedata='no';
outfilename='swanwaterlevel.wl';
outfilelocation=pwd;
CalcMethod='linear';
[swanwaterlevel,waterlevelpoint]=swanwaterlevelspvariedsct(xgrid,ygrid,xpoint,ypoint,waterlevel,savedata,outfilename,outfilelocation,CalcMethod);

References#

Booij, N. R. R. C., Ris, R. C., & Holthuijsen, L. H. (1999). A third‐generation wave model for coastal regions: 1. Model description and validation. Journal of geophysical research: Oceans, 104(C4), 7649-7666.

SWAN Team. (2007). S WAN user manual. Delft University of Technology. The Netherlands.

swanwaterlevelspvariedsct

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