The format of the bathymetry correction can be specified as
· Varying in space, constant in time
· Varying in space, varying in time
The file must be a 2D unstructured data file (dfsu) or a 2D grid data file (dfs2). The area in the data file must cover the model area. If a dfsu-file is used piecewice constant interpolation is used to map the data. If a dfs2-file is used, bilinear interpolation is used to map the data.
In case the bathymetry correction is defined as constant in time, the first time step in the bathymetry correction data file is applied as an initial condition in the simulation. In case the bathymetry correction is defined as varying in time, the bathymetry correction data must cover the complete simulation period.