Inverse solution

A discussion forum for users of the new HYDRUS 2D/3D. HYDRUS is a software package for simulating water, heat and solute movement in two- and three-dimensional variably saturated media. Happy Posting!
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fsahmed119@gmail.com
Posts: 7
Joined: Thu Nov 15, 2018 6:21 pm
Location: USA

Inverse solution

Post by fsahmed119@gmail.com » Wed Nov 21, 2018 8:14 pm

Dear All,

I have gone through the inverse solution process in Hydrus and I have a question regarding the term "position" there. I have volumetric water content readings at two specific locations based on my field reading. Based on Hydrus, I see that my type will be "2" but I am unable to understand the "position" term in Hydrus. In the manual, it says that the position for my situation will be "observation node number". I have readings for 3 days at two observation points so I guess, I have to make 2x3 rows of data and give my field readings. My query was how will Hydrus understand that for which node will it assign the first 3 rows of data and the other node for the second 3 rows of data. My assumption is the lowest assigned numbered node will be for the first 3 rows but I am unsure. If everything I assumed is right, then I plan to give the input data as below. I will be very grateful if you please guide me if my assumption and my format below for giving the data are right

X Y Type Position Weight
1 0.1 2 2 1
2 0.2 2 2 1
3 0.4 2 2 1
1 0.29 2 2 1
2 0.31 2 2 1
3 0.35 2 2 1


Thank you,

Faisal

Jirka
Posts: 4620
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: Inverse solution

Post by Jirka » Wed Nov 21, 2018 8:39 pm

See the Cone project that is distributed with the HYDRUS (2D/3D) installation. In this project there are pressure head measurements at two locations. After that it should then be clear how to do this. J.

fsahmed119@gmail.com
Posts: 7
Joined: Thu Nov 15, 2018 6:21 pm
Location: USA

Re: Inverse solution

Post by fsahmed119@gmail.com » Mon Nov 26, 2018 5:20 pm

Dear Sir,

Thank you very much for your reply. I have tried to search the manual but if you can give me to which specific project should I see then it will be very helpful to me.

Thank you,

Faisal

Jirka
Posts: 4620
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: Inverse solution

Post by Jirka » Mon Nov 26, 2018 8:56 pm

I have already done that in my previous email. J.

fsahmed119@gmail.com
Posts: 7
Joined: Thu Nov 15, 2018 6:21 pm
Location: USA

Re: Inverse solution

Post by fsahmed119@gmail.com » Tue Nov 27, 2018 6:14 pm

I have installed the Hydrus 2D/3D and opened the cone project with the inverse solution. I understood what I have to do but I have a query. I saw that the project has 5 observation nodes but the inverse solution data has input data for two nodes. I assumed that Position 2 is for Observation Node 2 and Position 1 for Observation Node 1. Is it right? Can I give data for Observation Node 1 before Observation Node 2?

Thanks,

Faisal

Jirka
Posts: 4620
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: Inverse solution

Post by Jirka » Tue Jan 01, 2019 7:25 pm

Of course. J.

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