Walker equation and nitrification
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Walker equation and nitrification
I am working on a nitrogen chain model. I am using the Walker equation for water content dependence for denitrification (ramps up as water content approaches saturation). I would like to use the Walker equation for nitrification. Is there a way to manipulate the equation parameters so that it ramps down at high water contents? Thanks.
Re: Walker equation and nitrification
Walker's equation has been developed for the degradation of pesticides and can produce the following reduction functions.
I think that it would be difficult to manipulate it to produce different shapes. J.
I think that it would be difficult to manipulate it to produce different shapes. J.
Re: Walker equation and nitrification
Hi David,
I have looked at that again. If you select negative values for B, you can likely achieve what you want. J.
I have looked at that again. If you select negative values for B, you can likely achieve what you want. J.
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Re: Walker equation and nitrification
Perfect! Thanks so much.
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Re: Walker equation and nitrification
Oops, when I use a negative exponent I get an error:
"Floating Point Error! Calculation unstable.
Please check out input data..."
"Floating Point Error! Calculation unstable.
Please check out input data..."
Re: Walker equation and nitrification
The code was indeed working only for Walker equation with positive exponent (as designed). I copy below the computational module that can handle both cases (I do not think that PC-Progress will be updating version 2 of HYDRUS (2D/3D) when version 3 is already released).
J.
J.
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- Posts: 16
- Joined: Wed Oct 07, 2009 3:32 pm
Re: Walker equation and nitrification
Thanks again.