Search found 4982 matches

by Jirka
Sun Jul 19, 2020 5:29 pm
Forum: Hydrus 1D
Topic: Water content smaller than residual water content
Replies: 1
Views: 125

Re: Water content smaller than residual water content

Note that it is within the water content tolerance (which you set to 0.001, default value). You may reduce it (e.g., to 0.0001) if you want to avoid this. J.
by Jirka
Thu Jul 16, 2020 8:29 pm
Forum: Hydrus 1D
Topic: Surface runoff with snow layer
Replies: 2
Views: 139

Re: Surface runoff with snow layer

The model is actually implemented slightly differently than described in the manual (and I should provide there more detail). I assume that this simple algorithm (temp interval between -2 and +2C)) is used only when the soil is fully exposed, i.e., is not covered by snow. Once it is covered by snow ...
by Jirka
Wed Jul 15, 2020 5:42 pm
Forum: HYDRUS (2D/3D)
Topic: non convergence with boundary precipitation data
Replies: 5
Views: 214

Re: non convergence with boundary precipitation data

If the project works for loam but not for other soil materials, it is just the question of having appropriate spatial and temporal discretization and iteration criteria. J.
by Jirka
Mon Jul 13, 2020 4:21 pm
Forum: HYDRUS (2D/3D)
Topic: HP2 examples with 1D
Replies: 4
Views: 223

Re: HP2 examples with 1D

HP1 will be at least twice as fast. On the other hand, the GUI for HP2 is much more advances. I would likely prepare the PHREEQC.in file in the HP2 GUI and then transfer that info into HP1 and run HP1. J.
by Jirka
Mon Jul 13, 2020 2:52 pm
Forum: HYDRUS (2D/3D)
Topic: non convergence with boundary precipitation data
Replies: 5
Views: 214

Re: non convergence with boundary precipitation data

Make sure that you have the signs of the fluxes correct (for time-variable fluxes: positive outflow, negative inflow) and sufficient discretization (FAQ 8):
http://www.pc-progress.com/Documents/No ... zation.pdf
J.
by Jirka
Mon Jul 13, 2020 2:44 pm
Forum: HYDRUS (2D/3D)
Topic: HP2 examples with 1D
Replies: 4
Views: 223

Re: HP2 examples with 1D

They were all done on 2D domains. Since we wanted to verify the numerical solution of HP2 with HP1, we assumed two parallel columns of nodes in the examples that we denote as "One-Dimensional Verification Examples (for comparison with HP1 examples)". J.
by Jirka
Thu Jul 09, 2020 2:58 pm
Forum: Hydrus 1D
Topic: Transport of contaminants in sandy soils
Replies: 3
Views: 217

Re: Transport of contaminants in sandy soils

Before you start using HYDRUS, you should attend a grammar school and be able to read. Such as Help or Manual. J.
by Jirka
Wed Jul 08, 2020 10:22 pm
Forum: Hydrus 1D
Topic: how to build a model that to estimate the time of filling up the soil column?
Replies: 1
Views: 167

Re: how to build a model that to estimate the time of filling up the soil column?

If you are new to HYDRUS you should either take a HYDRUS short course (note that one is organized next week) or carry out tutorials from this tutorial eBook: CSIRO Tutorial eBook: https://www.pc-progress.com/Downloads/Public_Lib_H1D/HYDRUS-1D_Tutorial_V1.00_2018.pdf The examples for the CSIRO Tutori...
by Jirka
Wed Jul 08, 2020 10:19 pm
Forum: Hydrus 1D
Topic: Transport of contaminants in sandy soils
Replies: 3
Views: 217

Re: Transport of contaminants in sandy soils

Here is a list of some of the peer-reviewed journal studies in which HYDRUS has been used to simulate the transport of antibiotics or pharmaceuticals: Zhang, M., I. Engelhardt, J. Šimůnek, S. A. Bradford, D. Kasel, A. E. Berns, H. Vereecken, and E. Klumpp, Co-transport of chlordecone and sulfadiazin...
by Jirka
Mon Jul 06, 2020 7:52 pm
Forum: Hydrus 1D
Topic: Groundwater recharge model not converging
Replies: 2
Views: 182

Re: Groundwater recharge model not converging

If you are new to HYDRUS, you should consider taking the online short course. See details at
https://www.pc-progress.com/en/Default. ... 2020-China

J.
by Jirka
Fri Jul 03, 2020 5:02 pm
Forum: HYDRUS (2D/3D)
Topic: Perc test simulation
Replies: 2
Views: 184

Re: Perc test simulation

Please note that we posted almost identical examples (Well-radial) to yours at https://www.pc-progress.com/en/Default.aspx?h3d2-lib-ReservoirBC. What to pay attention to: 1. The z coordinates are the absolute coordinates as used to define the transport domain. If you have the origin of the coordinat...
by Jirka
Thu Jul 02, 2020 10:13 pm
Forum: Soil Physics with Hydrus
Topic: calculation of water and elements fluxes
Replies: 2
Views: 828

Re: calculation of water and elements fluxes

I provide online support only for the applications of the HYDRUS-1D codes. I do not discuss online other soil physics issues. J.
by Jirka
Thu Jul 02, 2020 7:01 pm
Forum: Hydrus 1D
Topic: Solute transport
Replies: 3
Views: 246

Re: Solute transport

You need to specify all boundary fluxes as they occurred (i.e., precipitation, irrigation, etc). In addition, you need to associate your solute application with a water flux such so that you get the right amount (i.e., Conc*Flux*Time) into the soil profile.
J.
by Jirka
Wed Jul 01, 2020 7:41 pm
Forum: Hydrus 1D
Topic: Solute transport
Replies: 3
Views: 246

Re: Solute transport

Solute can enter the soil profile in HYDRUS only as a solute flux. You should use the Cauchy BC and associate your N application with some liquid flux. J.
by Jirka
Wed Jul 01, 2020 5:53 pm
Forum: HYDRUS (2D/3D)
Topic: Well as constant head
Replies: 9
Views: 1513

Re: Well as constant head

I'm not sure what you mean. Linear distribution of the pressure head on the boundary representing the well (in the reservoir BC)? What else would you suggest than using the hydrostatic pressure head? J.