Outflow of SWAT-CUP and SWAT model is not matching.

[Eshrat Jahan Esha]

I am trying to develop a SWAT model for a small river basin of the South-Asian region. I am using SWAT-CUP 2012 (5.1.6 version) for model calibration and I am setting the model on ArcSWAT 2012.10_4.21 version. 

After the calibration process of SWAT-CUP when I give the fitted parameter values in the SWAT model through manual calibrator/Sub-basin edit; the outflow is not matching with the outflow of SWAT-CUP. I have been calibrating my model for one sub-basin (sub-basin no. 1) in SWAT-CUP. The outflows of SWAT-CUP and SWAT model are not matching either I change the parameters for the same sub-basin or for all the sub-basins (which I need to do).

Can anyone help me to solve this problem?

I have attached the parameter and outflow details here. Thank you.

[Md. Sakib Hasan Tumon]

It would help if you found out which parameters are responsible for
high peak flow. Reduce the values of these parameters, like the trial
and error methods.

You can see this article:
https://www.sciencedirect.com/science/article/pii/S0022169415001985

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[2w2e]

You can also try asking CHAT SWAT at www.2w2e.com

Once you log in to the site, you will receive 20 free credits.

Karim

[Eshrat Jahan Esha]

I did change the parameters like Cn2, ESCO, Sol_AWC etc according to their sensitivity to lower the peak. I also followed the article you mentioned. Initially my model overestimated the peak and the baseflow was underestimated. The initial nse value of the model was -2.73, I was able to get nse 0.66 after several iterations in SWAT-CUP using 17 parameters. The problem is when I put the best fitted parameters back into swat model the peak is not getting low like the way it did in swat-cup. For example: the CN2 is lowered to 46 from 73 (for LULC->FRST) but it didn't change the outflow much in the model. I set-up the model again and did calibration again but unable to solve the problem. Is there any other way to solve the issue? 

[Sushma Poudel]

Did you update the parameter value manually in SWAT or through the query in the Project MS-Access? If you haven't tried it through that, try it once! 

[Eshrat Jahan Esha]

I used both manual calibrator and subbasin edit option also checked the project mdb file to ensure if the parameter updated or not after rewriting input files in the model. But it didn’t solve the problem.

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[Sushma Poudel]

Try it through the update query in the project database, and rewrite it in SWAT. If that doesn't work, it will confirm that the problem is not in writing the files but could be in performing calibration. I haven't got this problem yet, so I am just suggesting you try a new way to write files.

On Sunday, September 1, 2024 at 1:44:56 PM UTC+5:45 Eshrat Jahan Esha wrote:

[Muhammad Ishaq.]

I had the same problem , my model was well calibrated but I was unable to use those calibrated values for my scenarios determination. Like I copied the input files including the TMP and PCP and run my simulations in arc SWAT . I got value which were not as per the calibrated model and there a lot of deviations.

Can you elaborate a bit how we can change the parameters in MS Access after the calibration???

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[Sushma Poudel]

You can create a query design in the Project database and select the table you want to update. You can then update the parameters according to the method you used in the calibrating the parameters in SWAT-CUP, if v is used you can just write the parameter value, if r is used then you can use the formula for updating. If you want to learn more about it, you can just search how to update a query in the database.

Regards,

[Muhammad Ishaq.]

Thanks, let me search for it .

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[Eshrat Jahan Esha]

I searched for query updates but unable find any useful source. Can you kindly give use some useful link that can help to implement the process? Thank you.

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[PIERRE MALANG SADIO]

Hello everyone,
Please, I need help, the calibrate option does not display on swat-cup after configuration.
Here is the attached image.

Doctorant au Laboratoire d'Océanographie, des Sciences de l'Environnement et du Climat (LOSEC), Physique, Université Assane SECK de Ziguinchor BP 523 Ziguinchor - Sénégal Email: p.sad...@zig.univ.sn            pierre...@gmail.com Tel : +221777045899         +221770851917

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[Eshrat Jahan Esha]

Try to restart your project or you can try reinstalling swat-cup again. Hope this helps.

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[PIERRE MALANG SADIO]

Thank you very much, I uninstalled and then reinstalled and it worked.

Doctorant au Laboratoire d'Océanographie, des Sciences de l'Environnement et du Climat (LOSEC), 

Physique, Université Assane SECK de Ziguinchor BP 523 Ziguinchor - Sénégal 

Email: p.sad...@zig.univ.sn            pierre...@gmail.com 

Tel : +221777045899         +221770851917

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