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 Raphael (Raphael) posted on Monday, May 31, 2010 - 12:07 pm
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Hi Tom,
I wonder how to calculate the late erosion rate (wich value can be recommended)? (version 6.0)
Another problem is some overflowing and exagerated erosion next to the discharge entry cells. Do I have to add this entry area in the bedrock data file (reach mode)like a non erodable zone? Is it only a problem because I didn't make a "wall" at the LH edge of my DEM (I've realised a bit late)?
Thanks for your help
Best regards
Raphaël |
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Hi Raphael,
The value for the lateral erosion rate is hard to determine - it has also changed in the latest versions of CAESAR (sorry).. The best way to determine it is through calibration - for example take some existing measurements of lateral erosion rates (e.g. from old maps/aerial photographs) and run caesar with different erosion rates and see which fits best?
But for now I would not spend too much time on this as I have been working on this part quite a bit and the rate will change (as the rules governing lateral erosion have changed in the model).
For your secodn question. Yes - this can be a problem where the model erodes too much at the inlet. Again - I think I've fixed this in the latest version. But you are correct, one fix is to create a bedrock DEM to prevent it incising too much. This shuold not take too long - and adding the 'wall' at the LH edge is also a good idea!
Tom |
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