The sediment data, e.g. the mean grain diameter and grading coefficient, can be specified as
· Constant (in domain)
· Varying in domain
For the case with values varying in domain you have to prepare a data file containing the mean grain diameter and grading coefficient before you set up the sand transport 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 piecewice constant interpolation is used to map the data. If a dfs2-file is used bilinear interpolation is used to map the data.