Infiltration rate in Hydrus 2D

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ES_92
Posts: 19
Joined: Sun Dec 06, 2020 11:22 am
Location: Italy

Infiltration rate in Hydrus 2D

Post by ES_92 » Sun Mar 21, 2021 1:03 pm

Hello,
I am simulating a 2D model (40 cm X 60 cm) for subsurface porous pipe to determine the infiltration rate. The subsurface pipe has constant boundary flux of 4.14 cm/hour. In the Cum_Q.out file as far as I have understood cum Q1 value is the infiltration and the unit is in L^2 for different time steps, if I want to convert the rate to L, should I divide all these values by the length (40 cm) of the model domain?
Also, is the constant boundary flux independent of the system? If I want to simulate the infiltration which depends on the soil properties, how should I proceed? I have not considered any atmospheric boundary for my model, only flux boundary through the pipe. Because I want to simulate how does the pipe behaves in different soil types. Any insight will be really helpful Thanks.
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Jirka
Posts: 5268
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: Infiltration rate in Hydrus 2D

Post by Jirka » Sun Mar 21, 2021 8:05 pm

The Cum_Q.out file gives cumulative values of boundary fluxes. The units, for 2D applications, are L^2, which you can interpret as L^3/L (i.e., per unit length in the perpendicular direction to the transport domain).

If you use a constant flux BC, then infiltration will be independent of the texture. If you use a constant head BC, then infiltration will depend on the texture.
J.

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