Search found 4827 matches

by Jirka
Sun Dec 22, 2019 2:11 am
Forum: Hydrus 1D
Topic: Example 2 in Hydrus-1D Manual
Replies: 1
Views: 303

Re: Example 2 in Hydrus-1D Manual

Example 2 from the manual is installed together with the Hydrus-1D software. You should be able to find it in the Direct Project Group as Test2. I do not think that you can download this example from the HYDRUS website. J.
by Jirka
Sat Dec 21, 2019 10:44 pm
Forum: Hydrus 1D
Topic: Eto Penman monteith vs Eto Hargreaves
Replies: 6
Views: 389

Re: Eto Penman monteith vs Eto Hargreaves

Thanks for clarifying. I have been really confused by your post. J.
by Jirka
Sat Dec 21, 2019 8:47 pm
Forum: HYDRUS (2D/3D)
Topic: 3D display dissappears
Replies: 4
Views: 156

Re: 3D display dissappears

We would need to see the project itself, since we cannot reconstruct the problem. I have tried the two standard HYDRUS examples (Furrow and Test8 in 2D and 3D, respectively) with 40 print times and could display them all. J.
by Jirka
Thu Dec 19, 2019 5:42 pm
Forum: HYDRUS (2D/3D)
Topic: Mesh Lines and confirming cumulative boundary flux rates
Replies: 15
Views: 1334

Re: Mesh Lines and confirming cumulative boundary flux rates

I have tested both version 2.04 and 2.05 with more than 6 meshlines, and with 3 solutes, and the code was working fine for me. J.
by Jirka
Thu Dec 19, 2019 12:07 am
Forum: HYDRUS (2D/3D)
Topic: Mesh Lines and confirming cumulative boundary flux rates
Replies: 15
Views: 1334

Re: Mesh Lines and confirming cumulative boundary flux rates

I should clarify. I found a bug in Version 3.02, and that is the bug Mirek fixed. I have not seen the error in version 2.05. I do not have anymore the version 2.04. J.
by Jirka
Tue Dec 17, 2019 11:05 pm
Forum: HYDRUS (2D/3D)
Topic: Mesh Lines and confirming cumulative boundary flux rates
Replies: 15
Views: 1334

Re: Mesh Lines and confirming cumulative boundary flux rates

Indeed, there seems to be an error in GUI when 5 or more meshlines are used. The program works well when there are up to 4 meshlines. We need to check this bug. Sorry for that. In the meantime, use only up to 4 meshlines. J.
by Jirka
Tue Dec 17, 2019 5:32 pm
Forum: Hydrus 1D
Topic: Eto Penman monteith vs Eto Hargreaves
Replies: 6
Views: 389

Re: Eto Penman monteith vs Eto Hargreaves

I have no idea how you got these solar radiation values from my posting above (where I only show potential evapotranspiration fluxes calculated by either PM or Hargreaves equations). J.
by Jirka
Tue Dec 10, 2019 3:32 pm
Forum: Hydrus 1D
Topic: jump in the value of theta
Replies: 3
Views: 120

Re: jump in the value of theta

First, if you have not actually measured both wetting and drying curves, I do not think that you should be using the hysteresis option in HYDRUS. Second, your other questions: 1. Please, read the manual, where all the models are discribed in detail. 2. Parameter Qm expands the flexibility of the mod...
by Jirka
Mon Dec 09, 2019 6:00 pm
Forum: Hydrus 1D
Topic: jump in the value of theta
Replies: 3
Views: 120

Re: jump in the value of theta

You probably encountered some numerical instability. Perhaps use a different model of hysteresis (e.g., Lenhard et al.). J.
by Jirka
Mon Dec 09, 2019 5:58 pm
Forum: Hydrus 1D
Topic: No data in Time Variable Boundary Conditions and Meteorological Conditions
Replies: 1
Views: 97

Re: No data in Time Variable Boundary Conditions and Meteorological Conditions

You cannot use this option if you do not have values for all required inputs. J.
by Jirka
Mon Dec 09, 2019 5:50 pm
Forum: Hydrus 1D
Topic: Eto Penman monteith vs Eto Hargreaves
Replies: 6
Views: 389

Re: Eto Penman monteith vs Eto Hargreaves

The problem listed above has been fixed a decade ago. My experience is that these two models give very similar results if correct input is used. See an example for a Nevada desert. Hargreaves.png Note that ETo is reference ET, not actual ET, and thus can be larger than precipitation (and almost alwa...
by Jirka
Tue Nov 26, 2019 10:36 am
Forum: HP1 (HYDRUS-1D - PHREEQC)
Topic: How should i enter our data in HP1
Replies: 3
Views: 632

Re: How should i enter our data in HP1

Please note that we have posted a large number of examples and tutorials on the HYDRUS website on how to use HP1, e.g., https://www.pc-progress.com/en/Default.aspx?h1d-tutorials#k6 You can also check this document: Jacques, D., and J. Šimůnek, Notes on HP1 – a software package for simulating variabl...
by Jirka
Fri Nov 22, 2019 11:51 pm
Forum: HYDRUS (2D/3D)
Topic: Dual porosity / Dual permeability
Replies: 1
Views: 637

Re: Dual porosity / Dual permeability

Since in the dual-permeability model there are two mobile domains, one needs to decide into which domain water flows (e.g., infiltration). However, in the dual-porosity model there is only one mobile (and one immobile domain), all water flow to the mobile domain. The interactions between the mobile ...
by Jirka
Thu Nov 21, 2019 2:49 pm
Forum: HYDRUS (2D/3D)
Topic: Nitrate calibration using inverse modelling
Replies: 1
Views: 334

Re: Nitrate calibration using inverse modelling

1. That's up to you whether you run HYDRUS in the direct mode or calibrate the model against your experimental data. I think that it is always better to start with the direct mode and then adjust the parameters in the inverse mode. 2. Note that all these parameters are very clearly described in the ...
by Jirka
Wed Nov 20, 2019 6:29 pm
Forum: HYDRUS (2D/3D)
Topic: BC. options in Hydrus 2D/3D version 1.10
Replies: 2
Views: 354

Re: BC. options in Hydrus 2D/3D version 1.10

I would think so. Although I have to admit that I do not have version 1 installed on my PC any longer since it is more than 10 years since we replaced it with version 2, and later with version 3. J.