Hello researchers, I am currently trying to make inundation maps for a coastal area. Now suppose sea-level rise is 1m for an area, the DEM cells which are less than or equal to 1m (considering sea as datum) will be inundated. Now there will also be some cells which might not be hydrologically connected to the sea boundary.
So how to get only those cells highlighted which are connected to the sea or already inundated cells?
I am trying to understand Bathtub inundation model which is popularly known.
Hi Adrij Kanti Roy ,
There are several useful publications on how to generate inundation maps utilizing the bathtub model (e.g. Poulter & Halpin 2008, Van der Sande et al. 2012).
The work-around to assure hydrological connectivity is to identify pixels belonging to the inundation extent by grouping pixels (this is explained in Van der Sande et al, 2012 "Sensitivity of Coastal Flood Risk Assessments to Digital
Elevation Models").
If you work in a GIS environment, run a grouping of pixels after you calculated inundated areas (in ArcGIS the tool is called "Region Group"). This is assigning a new pixel value to each "patch/group" of pixels that are in connection. Once you have identified your inundation extent from this output, simply reclassify the data to isolate your inundation extent.
Best regards
Kris
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