TUFLOW Remapping: Difference between revisions

In direct rainfall modelmodels, modellers can also benefit from applying relatively large mesh size and SGS method at the upstream region of a catchment. The SGS faces correctly capture the lowest elevations along the gullies to preserve the sub-cell scale flow paths, which improves the hydrologic response for a whole catchment model (see Kitts et. al., 2020, will add link to Duncan's paper in https://www.tuflow.com/Library.aspx when it is uploaded). However, if the cell size gets too large at the upstream region, only small portion of the cell becomes wet due to the large difference in elevation inside a cell. This makes the depth plotting extremely challenging and the remapped depth may become negative even though water is flowing through a valley. The blue contour below shows the remapped water depth of a 60m mesh whole catchment direct rainfall model. As can be seen the flow paths are not continuous along some valleys. The remapped water depth from a 20m mesh model is also plotted as the red contour underneath the 60m result. The flow path has becomes clearer as the mesh size is refined. <br>