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Water Transport

Posted: Wed Apr 10, 2019 4:44 pm
by ikipkemoi
Hi,

I am modelling basic water transport in a soil column. I have Precipitation (entered to precip) data and ETo (entered to rtop) data as variable boundary conditions, from the definitive concept of ETo, I am assuming that the evaporative demand of the atmosphere can be considered independent of crop type, crop development or management practices, I am correct that the data provided is what is needed and that my assumption of evaporative demand of the atmosphere is CORRECT?

Secondly, have a 1 meter, 3 layered soil material with the following hydrological parameters;

Material Qr [-] Qs [-] Alpha [1/cm] n [-] Ks [cm/hour] l [-]
1 0.0471 0.3799 0.0356 1.6008 3.1725 0.5
2 0.0471 0.3799 0.0356 1.6008 3.1725 0.5
3 0.0471 0.3799 0.0356 1.6008 3.1725 0.5

Since these are my initial conditions, I expected my water contents to start with a lower soil value (say close to residual), but it starts with values close to saturation.

Also please confirm that since i have residual and saturated soil water contents (estimated by Rosetta), I do not need model Warm-Up period?

Thank you for your views,
Isaac Kipkemoi

Re: Water Transport

Posted: Thu Apr 11, 2019 2:43 am
by Jirka
These are your soil hydraulic parameters (Qr [-] Qs [-] Alpha [1/cm] n [-] Ks [cm/hour] l [-]). These are not your initial conditions. You need to still specify the initial condition. J.

Re: Water Transport

Posted: Thu Apr 11, 2019 10:38 am
by ikipkemoi
Thank you Prof Jirka.

What does anyone in the forum think about ETo, the data I am using only Precipitation and ETo of course with soil hydraulic parameters?