Search found 16 matches

by Hydraus_1d_RD
Fri Jan 22, 2021 6:26 am
Forum: Hydrus 1D
Topic: Issue with the inverse model run in Hydrus 1D
Replies: 2
Views: 717

Re: Issue with the inverse model run in Hydrus 1D

Thank you for your suggestion, Jirka. After reviewing some of the pre-installed inverse solution examples for 1D case and the Chapter 9 in Hydrus 1D v 4.17 (especially pages 137 and 138), I'm still not sure how to specify sublayer-based averaged moisture content (defined as: volume of water in a lay...
by Hydraus_1d_RD
Tue Jan 19, 2021 9:21 pm
Forum: Hydrus 1D
Topic: Issue with the inverse model run in Hydrus 1D
Replies: 2
Views: 717

Issue with the inverse model run in Hydrus 1D

Dear all, I’m presently trying to run an inverse model that is stopping even on the very first few iterations. Some details about my models are: It has three material types and three layers/subregions and it runs for 6 years on daily time steps. I’m interested in the last three years of the model ru...
by Hydraus_1d_RD
Mon Jan 18, 2021 5:01 pm
Forum: Hydrus 1D
Topic: Request for guidance regarding the interception term in Hydrus1D
Replies: 3
Views: 1218

Re: Request for guidance regarding the interception term in Hydrus1D

Hi Jirka, I'm not using any snow module in Hydrus-1D. I used a separate model for estimating snowmelt rate from a snowpack. Using the snowpack melt rate and rain fall rate, I made a time series that has two columns: (a) precipitation amount (cm/day) and (b) melt flag- which is 0 if fractional contri...
by Hydraus_1d_RD
Thu Jan 14, 2021 10:57 pm
Forum: Hydrus 1D
Topic: Request for guidance regarding the interception term in Hydrus1D
Replies: 3
Views: 1218

Request for guidance regarding the interception term in Hydrus1D

Dear all, I hope my email finds you well. I have a request for guidance regarding the interception term for my model for my field site that has seasonal snowpack. I used a model to convert the precipitation time series into rain and snowmelt, which I then used as precipitation input to my Hydrus-1D ...
by Hydraus_1d_RD
Thu Jan 07, 2021 8:46 pm
Forum: Hydrus 1D
Topic: Request for guidance regarding root distribution function
Replies: 2
Views: 1187

Request for guidance regarding root distribution function

Dear all, I hope my email finds you well. I have a request for guidance regarding how to specify normalized root distribution function or b(x) in Hydrus-1D. The hydrus-1D document for b(x) says that b(x) -the normalized root water uptake distribution function- has to have a dimension of 1/L (page 17...
by Hydraus_1d_RD
Wed Jan 06, 2021 8:48 pm
Forum: Hydrus 1D
Topic: Now sure how to update a model parameter and the print time value
Replies: 4
Views: 1669

Re: Now sure how to update a model parameter and the print time value

Thank you, Jirka. As I need daily time step mass balance info for three years (total days=1095), I am slightly above the 1000 cutoff value. Would you please let me know if there is any possibility to extend the cutoff value any further to a very high value? My issue that when I try to calibrate soil...
by Hydraus_1d_RD
Tue Jan 05, 2021 7:04 pm
Forum: Hydrus 1D
Topic: Now sure how to update a model parameter and the print time value
Replies: 4
Views: 1669

Now sure how to update a model parameter and the print time value

Dear all, I’m presently trying to figure out how to do two following things in Hydrus-1D: 1) Change the With Air-Entry value of –2 cm (default) to some other value (e.g.,-5 cm). Would you please let me know if you have any suggestions? 2) I need mass balance results on daily time steps for my model ...
by Hydraus_1d_RD
Fri Jan 01, 2021 12:19 am
Forum: Hydrus 1D
Topic: Issue with the model convergence for water flow
Replies: 0
Views: 2554

Issue with the model convergence for water flow

Dear all, I’m presently trying to figure out how to address a convergence related issue for my soil moisture flow problem. I have a column with 4 soil layers (total thickness 61 cm) and one rock layer (total thickness 1 cm). I discretized the whole soil column into 0.2 cm intervals and I’m using the...
by Hydraus_1d_RD
Tue Dec 29, 2020 5:22 am
Forum: Hydrus 1D
Topic: Request for guidance regarding Van Genuchten-Maulem model parameters for rocks
Replies: 0
Views: 2575

Request for guidance regarding Van Genuchten-Maulem model parameters for rocks

Dear all, I’m presently trying to model a layered system with 80% soil material at the top and 20 % rock mass at the bottom. My objective is to understand the pattern of groundwater recharge due to induced atmospheric forcing at the top. While I already have Van Genuchten-Maulem model parameters for...
by Hydraus_1d_RD
Mon Dec 28, 2020 6:30 pm
Forum: Hydrus 1D
Topic: Confusion/request for guidance on the Hysteresis model
Replies: 7
Views: 1441

Re: Confusion/request for guidance on the Hysteresis model

Thank you so much!
Sincerely,
A Hydrus-1D user
by Hydraus_1d_RD
Sun Dec 27, 2020 5:54 am
Forum: Hydrus 1D
Topic: Confusion/request for guidance on the Hysteresis model
Replies: 7
Views: 1441

Re: Confusion/request for guidance on the Hysteresis model

I have one more request. Would you please let me know the method used in generating those figures? After reviewing the Test10 model setup and output files I noted the soil column is 72 cm long and it is discretized into 73 nodes. Therefore, I'm not sure if the theta(h) plot is at a specific location...
by Hydraus_1d_RD
Sun Dec 27, 2020 5:26 am
Forum: Hydrus 1D
Topic: Confusion/request for guidance on the Hysteresis model
Replies: 7
Views: 1441

Re: Confusion/request for guidance on the Hysteresis model

Thank you. Would you please let me know how can one estimate theta_s for both main wetting and drying curves separately? Are there any guidelines or rules of thumb for estimating them separately?
Sincerely,