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Figure: The bathymetry created for New Zealand. The colors in Delft Dashboard are updated based on the value defined to the specific grid cell.
Boundary conditions
The model now has a grid and bathymetry, but the boundary conditions forcing the model need to be defined next. This option differs per model.
For Delft3D-flow the following routines can be called
- Make open boundaries, this will result in the following routines (ddb_generateBoundaryLocationsDelft3DFLOW)
- Loading the defined the entire boundary of the model grid
- Determining which cross-sections are ‘open’. This is related with the bed level in the grid cell and the maximum bed level defined (zmax). The number of ‘open’ boundaries is determined with the value in the ‘cells per section’
- All the defined boundaries will get initial values in order to be initialized. This will however only mean an M2 and S2 harmonic with the amplitude of 1. The names given will be related with the location and the number of open cross-section (for example: ‘West 2’)
- Make boundary conditions, this will result in the following routines (ddb_generateBoundaryConditionsDelft3DFLOW)
- Loading the locations (x and y) of the different open boundaries and the start and stop time.
- Per location the amplitudes and phases will be determined. This will be based on a larger netCDF file were in a grid format phases and amplitude are stored for all latitude and longitude. In total 14 constituents are determined.
- Standard the boundary type is a water level. However, it is also possible to describe a current, Neumann, Riemann, etc.
- For the areas were no values are stored diffusion is applied
- A linear interpolation is used for the areas were an open boundary is described
Other
The Model Maker for Delft3D-FLOW has two additional possibilities:
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