Data

The format of the initial concentration (in component unit) for each fraction can be specified as:

·         Constant (in domain)

·         Varying in domain

A typical background concentration is 0.01 kg/m³.

For the case with varying in domain you have to prepare a data file containing the concentration (in component unit) before you set up the hydrodynamic simulation.

In case of 2D simulation the file must be a 2D unstructured data file (dfsu) or a 2D grid data file (dfs2).

In case of 3D simulation the file must be a 3D unstructured data file (dfsu) or a 3D grid data file (dfs3).

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 or dfs3-file is used, bilinear interpolation is used to map the data. In case the input data file contains a single time step, this field is used. In case the file contains several time steps, e.g. from the results of a previous simulation, the actual starting time of the simulation is used to interpolate the field in time. Therefore the starting time must be between the start and end time of the file.