TUFLOW Remapping: Difference between revisions

This command reads in an extra grid 'lowers_hazard.asc' and remaps it to the finder DEM resolution.The figure below compares the original and the remapped hazard outputoutputs from the 10/20m SGS model and the remapped hazard output.<br>

'''Figure 7 RemappedOriginal vs originalremapped hazard output for 10/20m mesh SGS model.'''<br><br>

It is important to note that, for any output types other than depth, this utility does NOT interpolate the result from the coarser grid to the finer grid, but only extended/reduced the output extent to the dry/wet extent. Therefore, the resolution of the remapped hazard above remains the same as the original output grid. The interpolation is not conducted for the following reasons:

* Hazard categories are usually depended on both water depth and velocity, and it is not straight forward to interpolate a cell averaged velocity to sub-cell scale velocities with varying water depth.

* Even if this can be done based on empirical relationship between depth and velocity, the obtained velocity is much less reliable than aan actual outputsimulation result from a model with finer mesh.

Therefore, we highly recommend refining the mesh size directly aif the location where userusers wantswant to obtain finer velocity or hazard output at certain locations. The figure below shows the hazard output from the 2.5/5/10/20m model, and as can be seen the hazard result is much smoother along the gully. <br>