## Search found 4982 matches

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.
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 ...
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.
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.
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 :
http://www.pc-progress.com/Documents/No ... zation.pdf
J.
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.
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.
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...
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...
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.
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...
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.
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.
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.
Wed Jul 01, 2020 5:53 pm
Forum: HYDRUS (2D/3D)