Search found 14 matches

by Sija
Fri Jun 19, 2015 1:00 pm
Forum: HYDRUS (2D/3D)
Topic: Time variable h boundary + option + temperature boundary
Replies: 1
Views: 3682

Time variable h boundary + option + temperature boundary

Dear Jirka, I am currently experiencing the following problem: In my model I have a time-variable h boundary (surface water) with a known temperature (time variable T). This generally works fine. However, since the surface water level changes over time, I wanted to use the option 'Seepage face BC wh...
by Sija
Mon Feb 20, 2012 1:15 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: inverse modelling: temperature
Replies: 9
Views: 13618

I am simulating heat transport and water flow (and no solute transport), and in the normal simulation results I see a temperature front moving through the domain. I also see temperature changes over time for observation node 10. For the inverse modelling, I entered similar (but never the same) value...
by Sija
Mon Feb 20, 2012 11:32 am
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: inverse modelling: temperature
Replies: 9
Views: 13618

No it does not give an overview of measured and fitted values (like it does when I test the same problem for (for example) pressure data). Below is a copy of the output file (note that the temperature values are hypothetical): -------------------------------------------------------------------- ****...
by Sija
Fri Feb 17, 2012 3:44 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: inverse modelling: temperature
Replies: 9
Views: 13618

Dear Jirka, It indeed seems like that, as if there is a division by zero or something similar after the last time step. I have tried to use many different combinations of values and also different models. However, the same problem remains. Is there anything else that could have gone wrong? Thank you...
by Sija
Wed Jan 04, 2012 10:12 am
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: inverse modelling: temperature
Replies: 9
Views: 13618

Dear Jirka, Thank you. I have been experiencing a problem with parameter estimation. I hope you can help me with this. The simulation model itself runs fine (without parameter estimation). The model simulates warm water flowing into a medium through different heads as boundary conditions. Observatio...
by Sija
Thu Dec 15, 2011 10:31 am
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: inverse modelling: temperature
Replies: 9
Views: 13618

inverse modelling: temperature

Dear Jirka, I would like to find hydraulic parameters using inverse modelling based on temperature measurements. From the user manuals I understand that Hydrus 2d only has inversed modelling with solute concentrations. Is there a non-GUI way to be able to use temperature data, or is it only possible...
by Sija
Wed Jun 29, 2011 10:11 am
Forum: HYDRUS (2D/3D)
Topic: Evaporation
Replies: 13
Views: 3663

Dear Jirka,

Is there a possibility to not only divide the atmospheric boundary in 2 parts, but the transpiration from plants as well? I haven't seen the option, but maybe there is a trick I haven't thought of?

Thank you,

Sija
by Sija
Wed Jun 15, 2011 8:41 am
Forum: HYDRUS (2D/3D)
Topic: Root distribution
Replies: 2
Views: 1576

You can also create a script that manipulates the domain.dat file and then import that file into your Hydrus project again.
That is how I dealt with this problem.

Good luck!

Sija
by Sija
Mon May 30, 2011 1:43 pm
Forum: HYDRUS (2D/3D)
Topic: Atmospheric boundary - Area
Replies: 1
Views: 1390

Atmospheric boundary - Area

Dear Jirka, I am trying to do a sensitivity analysis to compare different slopes. If I make a steeper slope, the surface area of the atmospheric boundary becomes of course larger. Does Hydrus correct for that, regarding precipitation? Or do I have to correct for that manually? What I mean is, is onl...
by Sija
Tue Apr 26, 2011 7:48 am
Forum: HYDRUS (2D/3D)
Topic: 3d results: cumulative evaporation
Replies: 3
Views: 1880

3d results: cumulative evaporation

Dear Jirka, I have a 3d model of a plant and bare soil and I would like to know the cumulative evaporation. In the 2d simulations I could obtain it from the Cum_Q.out file, but in the results of the 3d simulation I cannot find it. CumQ9 is the last colums. Is the cumulative evaporation somewhere 'hi...
by Sija
Wed Mar 16, 2011 2:46 pm
Forum: HYDRUS (2D/3D)
Topic: Periodic boundaries
Replies: 4
Views: 1991

Then I'll find some other way of reducing boundary effects.
Thank you!
by Sija
Wed Mar 16, 2011 2:38 pm
Forum: HYDRUS (2D/3D)
Topic: Periodic boundaries
Replies: 4
Views: 1991

Thank you for your answer. But I am afraid that my question was a little unclear. I am modelling a slope in 2D and would like to 'connect' the lateral boundaries, in order to simulate an 'infinite slope'. This would reduce the influence of boundaries (compared to no flow or constant head). I can see...
by Sija
Wed Mar 16, 2011 1:41 pm
Forum: HYDRUS (2D/3D)
Topic: Periodic boundaries
Replies: 4
Views: 1991

Periodic boundaries

Dear Jirka,

Would it be possible to use periodic boundary conditions in Hydrus?

Thank you in advance,

Sija
by Sija
Thu Mar 10, 2011 9:57 am
Forum: HYDRUS (2D/3D)
Topic: Patchy vegetation: root zone, bare soil, root zone
Replies: 1
Views: 1368

Patchy vegetation: root zone, bare soil, root zone

Dear Jirka, I am trying to make a model of a slope with patchy vegetation. I would like to have root zones on both sides of the modeled slope, but with bare soil in between. Is there any way in which I can use the root distribution parameters for multiple areas? When I try it I can only insert one r...