Need help in SWAT CUP calibration

[Yangti Jamir]

Dear SWAT CUP user

I'm currently working on Hydrological Modelling using SWAT CUP. After multiple calibration attempts, I'm not getting the desired results (NSE &R2) for my study region. The calibration period is from 2014 to 2018 (a two-year warmup period from 2012 to 2013), and the validation period is from 2019 to 2022. The Basin area is 1696.01 sq. km (19 sub basin) and uses daily runoff data. I have attached screenshots of my project for reference.

I would appreciate any suggestions or assistance you can provide.

Thank you

--

PhD scholar,

Department of Agricultural Engineering and Technology,

School of Engineering and Technology, 

Nagaland University.

[Shubham Gupta]

Dear Jamir,
Since you are using many parameters, there is high likelihood that you model is over parameterizing. Use the paper below. It is the closest help I can suggest.
source: https://www.sciencedirect.com/science/article/pii/S0022169415001985

[John Beasley]

Jamir & SWAT-CUP Google Group,

 

I have had similar issues with my model and had to navigate many multiple parameters, so I have attached two papers on parameterizing that I have utilized, and they have proved to be very helpful. Parameter management includes making a determination on the most sensitive parameters which is key to developing a hydrological watershed model that accurately predicts stream flow, sediments, nutrient loading, and pesticide transport. The first step for model calibration is validation at the watershed scale. It is also includes the process of identifying the model parameters that exert the greatest influence on model calibration or on model predictions.

I think these papers focus on parameterization and managing parameters and the values that they present, in order to achieve satisfactory metrics. I have also had better results using KGE and %PBIAS vs. NSE.

The two links below contain two published papers written by Dr. Arun Bawa, in which he details the process of calibrating the parameters and their range of acceptable values etc. 

·         https://www.sciencedirect.com/science/article/pii/S136481522400080X (original)

 

·         https://www.sciencedirect.com/science/article/pii/S1364815225000192?ref=pdf_download&fr=RR-2&rr=91f2d9f02e6e8789

 

Thank you,

On Wednesday, February 5, 2025 at 8:09:32 PM UTC-6 Yangti Jamir wrote:

Dear SWAT CUP user

I'm currently working on Hydrological Modelling using SWAT CUP. After multiple calibration attempts, I'm not getting the desired results (NSE &R2) for my study region. The calibration period is from 2014 to 2018 (a two-year warmup period from 2012 to 2013), and the validation period is from 2019 to 2022. The Basin area is 1696.01 sq. km (19 sub basin) and uses daily runoff data. I have attached screenshots of my project for reference.

I would appreciate any suggestions or assistance you can provide.

Thank you

John P. Beasley

Environmental Engineer

Southeast Environmental Service and Support Division

US Army Environmental Command - IMCOM

2455 Reynolds Road, Bldg. 2266

Fort Sam Houston, Texas 78234-7664

Off#: 520.674.1661

Mob#: 903.702.2150

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