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On 17/04/2019 19:34, Mehrdad Varedi
wrote:
No answers yet, so I will give a try: Each of the variables in your question are geomorphology characteristics. They depend only on elevation, slope, aspect. Flow accumulation is an area, TWI is area divided by tan(slope), etc. These characteristics have nothing to do with infiltration (i.e. penetrable areas).
Having said that, the GRASS module r.watershed can take two input rasters: flow and retention, which change the output flow accumulation. If you have spatial data on soil retention properties, or disturbances to surface flow, you can apply them to r.watershed to get a more "realistic" accumulation grid. The defaults are 100 for retention (no infiltration, all water flowing into a cell also goes out) and 1.0 for flow (no disturbances, and no additional contribution for each cell)
-- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab +972-523-665918 |
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