TUFLOW Remapping: Difference between revisions
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<poem lang="fr" style="float:left;">
The 2020 release of TUFLOW included new Quadtree mesh and Sub-grid Sampling (SGS) functionality. The SGS feature now supports the
hydraulic analysis of partially wet cells on the flood fringe. Currently, cells that are partially wet are displayed in model output
as being fully wet. 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 utility as an interim solution to 'remap' results to a finer DEM grid. This page introduces
how to use the ASC_to_ASC remap function, and discusses limitations of the method.</poem>
[[File: Remap_Advice_LinkedIn.jpg ||450px|right]]
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__TOC__
= Introduction =
With the release of TUFLOW 2020, the combination of Quadtree mesh and Sub-grid Sampling (SGS) method has offered great flexibility for rapidly building flood models of varying resolution and increased topographic detail. Now a wide range of mesh sizes can be applied in a model based on the geographic feature and the area of interest in a project. Especially with the SGS method, cells and faces can be treated as 'partially wet', and the impact of the sub-grid scale geometry may be represented by cells with larger sizes.<br>
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[[File:Fig2 H nonsgs.png|700px]]<br>
'''Figure 2 Water level simulation results without SGS. Left: 2.5/5/10/20m Quadtree model. Right: 10/20m Quadtree model.'''<br><br>
These examples show how the mesh size sensitivity are significantly reduced if using TUFLOW's implementation SGS. Therefore, modellers can confidently use a coarser mesh at areas away from the area of interest without adversely affecting the results. However, this has created a challenge on how to map results in areas of coarser mesh. For example, the images below show that whilst the 10/20m mesh and the 2.5/5/10/20m mesh SGS models produce similar water levels, the depth output is much 'smoother' in the 2.5/5/10/20m model due to the finer computational mesh. <br>
[[File:Fig3 D sgs zoom.png|700px]]<br>
'''Figure 3 Water depth simulation results with SGS. Left: 2.5/5/10/20m Quadtree model. Right: 10/20m Quadtree model.'''<br><br>
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