TUFLOW Remapping: Difference between revisions

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Whilst we are developing a high resolution SGS map output option for a future release, we have in the meantime added new functionality to the [[ASC_to_ASC|ASC_to_ASC]] utility to 'remap' a water level grid to a finer DEM grid. This page introduces how to use the [[ASC_to_ASC|ASC_to_ASC]] remap function, and discusses limitations of the method.

As illustrated in the chart below, the DEM has a much finer resolution and the elevation changes rapidly across the road crest, so when interpolating a coarser water level grid to the finer DEM, the interpolated water level may become lower than the local DEM level. In the 2D solver, this type of location is treated as upstream controlled weir flow with the upstream depth used for the calculation. However, the information that the flow is upstream controlled is not known when remapping, hence the appearance of dry patches on the downstream face of the road crest. Consideration of this effect will be addressed during the development of the high resolution SGS output feature scheduled for a future TUFLOW release.<br>