A discussion forum for book "Soil Physics with HYDRUS"
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Post by Grant » Tue Aug 18, 2020 1:16 am


I have read that "if no adsorption or source/sinks, then S=0 in the Advection Dispersion Equation" in the Soil Physics with Hydrus. Does this mean that S will NOT be equal to zero if the solute will be adsorbed by the soil even WITHOUT root water uptake?

Thank you in advance.

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Re: Sinks

Post by Jirka » Tue Aug 18, 2020 1:36 pm

No, it does not. The S term in eq. 6.14 usually represents kinetic processes (degradation, radionuclide decay, production, root solute uptake, etc). You can still have instantaneous sorption as described using adsorption isotherm (and the distribution coefficient Kd). J.

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