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Freshwater influence accretion rates

Started by Elena V, September 04, 2013, 06:10:41 PM

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Elena V

I recently noticed that accretion is not occurring as expected in areas defined as "freshwater influenced."

I first ran my model with an inverse linear relationship between accretion and elevation (low = 2 mm/year, high = 6 mm/year) in a region that was "freshwater influenced". All categories without the empirical relationship were assigned accretion of 3 mm/year.

Then I ran the same model, but with 2x the accretion rates and found no difference between the model outputs within the region of freshwater influence. There were differences outside the freshwater region.

To confirm, I ran the low/high accretion scenarios without freshwater influence and saw a major difference.

Am I implementing the freshwater influence module incorrectly? Or is it just a bug since this option is still relatively new in SLAMM?

Jonathan S. Clough

This is an interesting observation.  We had not yet experienced this problem.  We'll look into the code and test this out and get back to you shortly.  -- J


Hi Elena,
I could not reproduce your problem. One possible explanation of your results is that the turbidity factor in the fresh flow parameters is used and set to zero (or a very small number). In fact, as it is described in the users manual, if the turbidity factor is used, then the actual accretion rates in the fresh flow areas are given by the nominal values multiplied by the specified turbidity factor.

If that is not the case then I would be happy to have a look at your project and see if I can identify the cause.