June 23, 2018, 05:50:09 PM

News:

Due to SPAM attacks, new members must be approved before posting.  Please email jclough@warrenpinnacle.com when registering and your account will be approved.


Regularly Flooded marsh conversion causing vast elevation changes

Started by pse1999, February 24, 2018, 10:21:41 PM

previous topic - next topic
Go Down

pse1999

I am curious if anyone else who has used SLAMM to evaluate elevations has noticed when a cell converts to regularly flooded marsh that elevation decreases exponentially more than other classification types?
data derived from the below example is sourced from the GCPLCC dem and NWI ASCII files

for example (all elevations relative to MTL):

2006 2037 2068 2100     '06    '37    '68       '00
5   5      7      8         1.96    1.8     1.52   -1.19
5   5      7      8          2.11    1.9    -2.84  -3.25
3   3      7      8          1.93    1.66   1.28   -1.44
5   5      7      8          1.77    1.6      1.33   -1.39
5   5      7      8         1.82    1.65   1.38   -1.34

"8" is classified as "Regularly flooded marsh" and as seen it gradually decreases at first to essentially falling down a hole in the latter time steps. Is this common? is it the time step interval that is too large?

Any help would be very much appreciated.

Patrick

Jonathan S. Clough

Sorry I let this thread go cold.  I have not seen this type of response.  Wonder if you figured it out.  You may want to check the "marsh collapse" parameter that could cause this problem if mis-set.

Go Up