Hydrus output file: cRoot vs. cvRoot/vRoot

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Mitra
Posts: 27
Joined: Thu Dec 06, 2018 3:44 pm
Location: Switzerland

Hydrus output file: cRoot vs. cvRoot/vRoot

Post by Mitra » Fri Jan 25, 2019 12:48 pm

Hello,

I was wondering if you could explain on the difference between cRoot [M/L3] (read from solute.out) defined as Mean solute concentration of the root zone, and cvRoot/vRoot (read from solute.out and T_level.out) Actual root solute uptake [M/(L^2.T)] devided by actual transpiration rate [L/T]?
If I want to know the overal amount of root water uptake at every time step, and its corresponding concentration which of the two should I use?

Jirka
Posts: 5268
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: Hydrus output file: cRoot vs. cvRoot/vRoot

Post by Jirka » Sat Jan 26, 2019 12:39 am

cRoot (from solute.out) is simply the average concentration of the root zone, i.e., an integral of Conc over the rooting depth, divided by the rooting depth (basically, an arithmetic average). This value thus does not reflect the spatial root distribution (its intensity; Beta). If you divide cvRoot (Actual root solute uptake [M/(L^2.T)]) by vRoot (actual transpiration rate [L/T]), you will get the average concentration taken up by plant roots at a particular time. J

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