EOS4???????? linking between soil water contents and water vapor pressure in a thick unsaturated zone

Thanks a lot Stefan

Madi

Dear Stefan,

one more question about the same topic as i explained before i will use EOS4

to consider the water vapor diffusion and its effects on water content in a  thick vadose zone

which variable in the output of EOS4 file will express the mass fraction of  diffusive water vapor if i am not wrong XAIRG will express  the mass fraction of  diffusive air not diffusive water vapor

to make it more clear   i want to plot the concentration of  diffusive water vapor against the distance from the groundwater table,

thank you very much in advance Stefan an i have to understand every detail before starting to compile EOS4.

MADI

Dear Stefan,

i want to ask you about the first primary variable which is Pg in eos3 or eos4

i think i have to calculate the Pg as a function of depth z

in the unsaturated zone(10 m thickness) 2 phase flow will be considered so my question Pg will be the capillary pressure is that correct? when i put it as atmospheric pressure no diffusion of water vapor was occurred (i am exercising first with Eos3 later  will use eos4 )

thanks in advance

madi

Dear Stefan,

one more question to the same topic please

the second primary variable in EOS4 is Sg or gas saturation is it cosidered as(1-Sw) whereas  Sw water saturation according to Van genuchten or others ..??

is it right?

or Sg is water vapor saturation which is a part from the total gas saturation i explained above

i am asking this question because i have got values of XAIRG in the output which indicate the water vapor diffusion as you told me in a previous post in the same topic about 0.98 which means very big values and never express the water vapor but the total gas content in the soil porous

i hope i have a good imagination of the situation

thanks in advance

Madi
 

Thank you Stefan for your very helpful remarks

all the Best,

Madi

Dear Stefan,

as i explained in the previous posts i am doing the water vapour diffusion in 10 m unsaturated zone with eos4 when i run the model i had a problem that i could not solve why the PCAP capillary pressure in the output file are always zero in all time steps that is obviously wrong physically

i could not send the output file it is huge

Best,

Madi

Dear Stefan,

i found the mistake it was only that in writing RPCAP

i wrote it PCAP only 

if you donot  mind could you please check the boundary conditions for me from above atmospheric with large volume element and from below i took two elements one at  G water level and one 1 meter below ground water level i fixed these two elements or inactive them to make constant  temperature and pressure

sorry again for disturbing you often and thanks in advance

Madi

Dear Stefan according to the above question about the boundary conditions about the upper boundary condition i do not want to fix the values (make them constant)over my question must i set the volume of the atmospheric element in this case

later i have to put infiltration and evaporation rates i found in the literature you send me before

http://esd.lbl.gov/files/research/projects/tough/support/initial-boundary-conditions.pdf

"Specify infiltration rates in row of elements below the atmospheric 
boundary element using the GENER block"

if i do not want to make the atmospheric pressure and temperature fixed must i make this element in active and then GENER in the element below for infiltration

or make it active and GENER for the element below it or to delete the atmospheric boundary element and to applay the GENER on the element at the soil surface which is the first element then

thank you

madi

Dear Stefan

what i could not understand that when i put the the atmospheric element inactive or with large volume the temperature will be constant and equal to the initial value along the whole simulation and i can not consider the variation of temperature over time like when I  isolate this section of earth from the variation in temperature over the time

could you please make it more clear

thanks

madi

Dear Stefan

as a continuation to the previous post

i have just found the attached paper by chance

in this paper (Webb. W et al 2013) it was mentioned that there is another version of TOUGH2 which handles the variation in surface boundary conditions

 i want to ask you if eos4 will do the variation over time in surface boundary conditions like the temperature  etc, ..or i nead  T2TNT (mentined in the attached paper) for this purpose and i have to link it with EOS4  for vapor pressure lowering effects( Kelvin s equation)

i really need your help to consider that

thanks in advance

Madi

Dear Stefan

i mean number (1) time varying b.c  not only for the temperature in the atmosphere but also for other time dependent weather data like  maybe radiation and relative humidity wend speed, precipitation  all these together or at least some of them for long time series 2 or three year.. (i have to apply this  to find finally how the diffusive water vapor  affect the water content in a desert over the time)

i think it is impossible to put different time variables for long time series with daily recording(for example) all together in one  large GENER

if you do not mind explain me the best way to set this upper boundary and if i need itough2 with its tabular property  or it would be possible with normal TOUGH2 version# an what are your suggestions

thanks

Madi

Dear Stefan,

 i am using the normal TOUGH2, i checked an out put file it is version 2 as i can see

so, you mean i have to use itough2 in a forward way or you will do the tabular feature in the  very soon future????

sorry i have no idea about itough2 are all EOS types included in it

sorry again  for disturbing you quite often but really i want to learn from your experiences and to start my research correctly,

all the best,

madi