Root distribution

A discussion forum for book "Soil Physics with HYDRUS"
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Cranberry1
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Root distribution

Post by Cranberry1 » Mon Mar 26, 2012 4:16 pm

Hi Jirka,

I hope you are well. I have a few questions for you. My first is regarding the scaling factors. What does it mean in Hydrus? Finally, my second, does root distribution represent the capacity of water distribution in the root?

Best regards,

Cranberry1

Jirka
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Location: Riverside, CA

Post by Jirka » Mon Mar 26, 2012 4:33 pm

See the following sections of the manual:
Scaling Factors: Chapter 2.4
Root Distribution: Chapter 2.2

I do not know how better to describe it.

J.

Cranberry1
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Location: Canada

Post by Cranberry1 » Sun Apr 22, 2012 8:43 pm

Hi Mr. Jirka,

Could you please send me a copy of your article Parameter Optimization and Nonlinear Fitting, In: Methods of Soil Analysis, Part 1, Physical Methods, Chapter 1.7, Eds. J. H. Dane and G. C. Topp, Third edition, SSSA, Madison, WI, 139-157, 2002. Unfortunately, I wasn't able to find it on PC Progress or elsewhere. Second, in the inverse method, when I input my paramaters in the time field, I place them in daily measurments. Can I produce hourly data in simulated and experimental graphics (delta t)?

Thanks,

Cranberry1

Jirka
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Post by Jirka » Sun Apr 22, 2012 9:30 pm

<b>Paper</b>: YOu can get it at my webpage at http://www.pc-progress.com/en/Default.a ... ka-simunek

<b>Time steps</b>: You can use any time step you wish. The restrictions are quite minimal (only to be reasonable with respect to time discretization).

Jirka

Cranberry1
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Post by Cranberry1 » Sun Apr 22, 2012 10:33 pm

Hi Mr. Jirka,

Thanks for everything.

Regards,

Cranberry1

Cranberry1
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Post by Cranberry1 » Sun May 13, 2012 12:04 am

Hi Jirka,

I am unable to calculate the intial time step, minimum time step and maximum time step. As you suggested, I adopted 0.01d as my initial time step and 1s as my minimum time step but I get an error message that refuses my minimum time step. If my initial time is 0 and my final time is 600 hours, can you help me determine these variables.

Cordially,

Cranberry1

Jirka
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Location: Riverside, CA

Post by Jirka » Sun May 13, 2012 6:06 am

You need to use the same units for all values. J.

Cranberry1
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Location: Canada

Post by Cranberry1 » Tue May 15, 2012 3:33 am

Hi Mr. Jirka,

Why is it that in the post-processing I cannot find h(t). Every time I attempt it, I get time versus all pressure head. Can you please demonstrate how I can find h(t) simulated when I input Ep, Pt, Ks, Bc and BI.

Best regards,

Suzanne

N.B. Depth of soil profile = 100 cm

BC = Upper atmospheric bottom = constant pressure head

BI = Z = 0 corresponds to h = - 60 cm, z = 70 cm, h = 0 cm, z = 100 cm, h = 30 cm

siyapatel
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Re: Root distribution

Post by siyapatel » Mon May 27, 2019 11:23 am

Thanks for your great response..helpful post :)

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