Selecting dispersion coefficient option the format of the dispersion coefficient can be specified as
· Constant (in both time and domain)
· Varying in domain
For the case with dispersion coefficient varying in domain the values are constant in the vertical domain (in case of 3D simulation) and only varying in the horizontal domain. You have to prepare a data file containing the dispersion coefficient before you set up the hydrodynamic simulation. 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, a piecewise constant interpolation is used to map the data. If a dfs2-file is used, a bilinear interpolation is used to map the data.
Selecting Scaled eddy viscosity option the format of the scaling factor can be specified as
· Constant
· Varying in domain
For the case with values varying in domain you have to prepare a data file containing the scaling factor before you set up the hydrodynamic simulation. For a 2D simulation the file must be a 2D unstructured data file (dfsu) or a 2D data grid file (dfs2). For a 3D simulation the file must be a 3D unstructured data file (dfsu) or a 3D data grid file (dfs3). The area in the data file must cover the model area. If a dfsu-file is used, a piecewise constant interpolation is used to map the data. If a dfs2-file or a dfs3-file is used, a bilinear interpolation is used to map the data.