The format of the eddy viscosity coefficient, or the Smagorinsky coefficient, can be specified as
· Constant (in domain)
· Varying in domain
For the case with values varying in domain the values vary in the horizontal domain only. The values are constant in the vertical domain.
For the case with values varying in domain you have to prepare a data file containing the eddy viscosity coefficient or the Smagorinsky 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 piecewise constant interpolation is used to map the data. If a dfs2-file is used bilinear interpolation is used to map the data.