Simulating wetting and drying with SELFE

SELFE's wetting and drying capability has been carefully benchmarked and verified. There are 2 options: inunfl=0 as a 'light-weight' inundation scheme (you'd always start with this option), and a 'fine-scale' inundation scheme (inunfl=1), which requires some care. In particular, since extrapolation is used with inunfl=1, you'd make sure that the grid is reasonably resolved in the wetting and drying regions. This scheme may also require a smaller time step to very accurately capture the inundation process.

The wetting and drying process is inherently nonlinear and challenging, and below are some tips.

Bottom friction in shallow areas

A critical parameter in shallow area is the bottom friction. Note that the bottom friction parameterizations are very different between 2D and 3D model, and so you cannot use same input. For details please read this article.