Search found 4695 matches

by Jirka
Tue Jun 25, 2019 3:21 am
Forum: Hydrus 1D
Topic: How to calculate water ponding depth
Replies: 1
Views: 5

Re: How to calculate water ponding depth

The pressure head in the top node (or Surface Pressure Head). J.
by Jirka
Tue Jun 25, 2019 1:02 am
Forum: Hydrus 1D
Topic: Mass balance check: Balance.out vs. T_Level.out
Replies: 8
Views: 3495

Re: Mass balance check: Balance.out vs. T_Level.out

HYDRUS-1D reports in the Balance.out and T-Level.out files all values that you need to close te mass balance. From your questions, I do not understand what else you would need. J.
by Jirka
Thu Jun 20, 2019 4:11 pm
Forum: Hydrus 1D
Topic: Evaporation during ponded conditions
Replies: 3
Views: 27

Re: Evaporation during ponded conditions

I can't help you if I do not see the h1d project. You are clearly doing something wrong. BTW, I will not be available during the next five days. J.
by Jirka
Thu Jun 20, 2019 4:06 pm
Forum: Hydrus 1D
Topic: How to set actual evaporation rate as uper BC
Replies: 2
Views: 24

Re: How to set actual evaporation rate as uper BC

That's not a serious question, right? The column "Evap." should provide a hint. Similarly a couple of posted examples.

You should perhaps look at our tutorial CSIRO eBook: https://www.pc-progress.com/Downloads/P ... 0_2018.pdf

J.
by Jirka
Wed Jun 19, 2019 9:44 pm
Forum: HYDRUS (2D/3D)
Topic: Numerical solution not converging
Replies: 1
Views: 25

Re: Numerical solution not converging

Please read “Rules about spatial and temporal discretization (FAQ 8: http://www.pc-progress.com/Documents/No ... zation.pdf) and do not do things, which we clearly say that should not be done, such as changing Iteration Criteria. Otherwise I cannot comment on this project since I do not know what yo...
by Jirka
Wed Jun 19, 2019 3:19 pm
Forum: HYDRUS (2D/3D)
Topic: Particle tracking unstable
Replies: 3
Views: 38

Re: Particle tracking unstable

The particle tracking algorithm fails because of the initial location of particles near the vicinity of the drain with extremely small elements (which abruptly change into large elements). When I deleted particles 47 and 48, the problem ran quite well. J.
by Jirka
Tue Jun 18, 2019 10:28 pm
Forum: HYDRUS (2D/3D)
Topic: Temperature specifications in Var. Bound. Cond.
Replies: 3
Views: 2052

Re: Temperature specifications in Var. Bound. Cond.

TValue1 and TValue2 are temperatures that can be used with time-variable boundary conditions. The code by default uses TValue1, but you can change it to TValue2. Thus, essentially, you can have two time-variable boundary conditions with different temperature values. J.
by Jirka
Sat Jun 15, 2019 12:56 am
Forum: Hydrus 1D
Topic: Inverse Solution Doesn't Iterate
Replies: 18
Views: 10615

Re: Inverse Solution Doesn't Iterate

I suggest that you look at our CSIRO Tutorial eBook (https://www.pc-progress.com/Downloads/Public_Lib_H1D/HYDRUS-1D_Tutorial_V1.00_2018.pdf) for guidance on how to properly define your HYDRUS-1D project. I'm not going to do that for you. How can you expect that you will get solute leached out of the...
by Jirka
Fri Jun 14, 2019 12:50 am
Forum: Hydrus 1D
Topic: Solute transport as function of soil water content
Replies: 4
Views: 44

Re: Solute transport as function of soil water content

You should study the mathematical description of the model. The mass transfer is driven by a concentration gradient, i.e., is equal to Gamma_s=alpha*(c_m-c_im), see eq. 3.32. While the water content of neither domain is directly involved in the mass transfer of solute between the two domains (which ...
by Jirka
Thu Jun 13, 2019 11:24 pm
Forum: Hydrus 1D
Topic: Solute transport as function of soil water content
Replies: 4
Views: 44

Re: Solute transport as function of soil water content

I guess you will have to use some of the nonequilibrium models implemented into HYDRUS, such as the MIM dual-porosity models. J.
by Jirka
Thu Jun 13, 2019 4:40 pm
Forum: Hydrus 1D
Topic: Cosine function for variation of precipitation
Replies: 3
Views: 43

Re: Cosine function for variation of precipitation

It is some 20 years since I implemented this, so I do not remember all the details. I can see in the HYDRUS manual that I do not clearly reference this to Fayer (2000). Perhaps check the source code of the program that Fayer (2000) documents. If it is not there, then it may be only my modification. J.
by Jirka
Wed Jun 12, 2019 11:02 pm
Forum: Hydrus 1D
Topic: Running HYDRUS-1D projects sequentially outside of GUI
Replies: 1
Views: 39

Re: Running HYDRUS-1D projects sequentially outside of GUI

This is discussed in FAQs on the HYDRUS website. J.
by Jirka
Wed Jun 12, 2019 11:00 pm
Forum: Hydrus 1D
Topic: Cosine function for variation of precipitation
Replies: 3
Views: 43

Re: Cosine function for variation of precipitation

The reference is given in the HYDRUS-1D manual. J.
by Jirka
Wed Jun 12, 2019 1:36 am
Forum: Hydrus 1D
Topic: wrong cell format in "Time Variable Boundary Conditions" table for "Transp. [cm/day]
Replies: 1
Views: 38

Re: wrong cell format in "Time Variable Boundary Conditions" table for "Transp. [cm/day]

I have never had this experience anywhere else than in Europe on some local versions of Windows. For example, in Germany, the spreadsheets (and some tables in HYDRUS) interpret differently periods (which are used as a decimal point in US) and commas (which are used as a digital point in Germany). Yo...
by Jirka
Tue Jun 11, 2019 3:05 am
Forum: Hydrus 1D
Topic: Modeling Groundwater flow in Unsaturated zone
Replies: 1
Views: 48

Re: Modeling Groundwater flow in Unsaturated zone

I have no idea why this question is in the HYDRUS-1D discussion forum. In HYDRUS-1D, you clearly can consider only one vegetation type at a time, as it is a 1D model. You should be able to use Penman-Montheith equation to get the reference ET, then use the crop coefficient to get the potential ET. F...