Missing parameters GW_Delay, TIMP and SMTMP

[Somsubhra Chattopadhyay]

Hi

I am trying to calibrate my model and looking for these three parameters but couldn't find it in Editor. Does it mean that they have been removed from SWAT Plus?

1) GW_DELAY

2) TIMP  Snowpack temperature lag factor

3) SMTMP  Snowmelt base temperature

Can anyone inform me if these parameters have been renamed and perhaps included? 

Thanks

Som

--

Somsubhra Chattopadhyay, Ph.D

Postdoctoral Research Associate

Civil Engineering Department 

Warsaw University of Life Sciences, Poland

Cell: +48517023496

[Валерий Осипов]

1) Seems it was excluded

2) tmp_lag in snow.sno file

3) melt_tmp  in snow.sno file

понедельник, 4 октября 2021 г. в 15:34:57 UTC+3, Somsubhra Chattopadhyay:

[Natalja C.]

For the 1)  GW_DELAY

you might want to explore the  flo_max parameter in aquifer.aqu 

Best,

Natalja

[Rodrigo Marinao Rivas]

Hello  Natalja,

Thanks for your answer.

I am using SWAT + rev. 60.5.2, QSWAT + 2.0.6, and SWAT + Editor 2.0.4, and I can't find that parameter (flo_max) that you indicate inside the aquifer.aqu file.

I would really appreciate if you could clarify for me what the meaning of the flo_max parameter has, is it similar or equal to gw_delay from swat 2012? in which version of swat + was it incorporated?

Thanks in advance

[Natalja C.]

Hello,

It should be there in 60.1. Maybe it will be bf_max.

You can adjust the flo_min and flo_max (or bf_max) to get a sense of how these parameters work.

 real :: flo_min = 0.        !m          |water table depth for return flow to occur

 real :: bf_max = 0.         !mm         |maximum daily baseflow - when all channels are contributing  <-- this is flo_max

I always look at the version that is in the source code directory of swat+: https://swatplus.gitbook.io/docs/source-code

Best,

Natalja

[Rodrigo Marinao Rivas]

hi Natalja, thanks again.

I compiled the source code available at https://bitbucket.org/blacklandgrasslandmodels/modular_swatplus/src/master/ (rev. 60.5.3) on Linux, in order to assimilate the bf_max parameter.

I ran this version of SWAT+ with one of the examples available in the same repository (Little_River_Tifton), and manually tested the sensitivity of bf_max, changing the value between 0 and 2.

It turns out that with this exercise I could not see absolutely any change in the flow simulation derived from changing this parameter.

Could you tell me if the version that you work (where you know that bf_max is a parameter that is working) is the same that is in the bitbucket repository?

Sorry for the insistence, but I am currently working on a hydrological model where it is very important to have a good simulation of low flows, and conceptually I believe that this parameter could help to improve the representation of this part of the hydrograph.

Thanks in advance.

Rodrigo

[Lasantha Jayasinghe]

Hi All,

It seems like GW_Delay was excluded.

I also tried changing the bf_max parameter and does not appear any change in the flow simulation.

It is very important to have a good simulation of low flows in my case study too.

Appreciate it if anyone experienced this and have any solution for this.

Thanks

Lasantha