salt stress model and coefficient

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sct123
Posts: 8
Joined: Wed Aug 03, 2016 2:34 pm
Location: China

salt stress model and coefficient

Post by sct123 » Fri Aug 05, 2016 3:38 am

Dear HYDRUS developers and users
The crop I in my simulation is cotton, and the initial condition for solute distribution that I use the ECsw (electrical conductivity of soil solute), The threshold default value and slop in HYDRUS-1D is 15.4dS/m and 2.6, while in HYDRUS-2D they are 7.7dS/m and 5.2, respectively. I tried both the value and found there indeed has a difference , Anyone who can explain for this,Thanks in advance! Another problem is the coefficient, should I changed this or leave it with the default value? Many thanks

I may got the idea, I should make the threshold correspond to my initial simulation with the same unit and same format, for example, if I use ECsw in my simulation, I should input the threshold value with a correspond value of ECsw, and for the osmotic coefficient, I can choose 3.8106 (hf = -3.8106 ECw+0.5072, in HYDRUS-1D help) for additive model and choose for one for the multiplicative model. I am not sure if it is right, please give me a confirmation, Thanks in advance.

Kind regards
Sun

Jirka
Posts: 4716
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: salt stress model and coefficient

Post by Jirka » Fri Aug 05, 2016 10:55 am

See the help of HYDRUS-1D, where I explain how we convert the threshold and slope values of the stress response function. We do that in both HYDRUS-1D and HYDRUS (2D/3D) in the same way. We were not doing this conversion in the old HYDRUS-2D, which is not being updated for the last ten years. J.

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