SIMULATIONS IN SWAT CUP CALIBRATION VERY DIFFERENT AND A STRAIGHT LINE

[georgezay...@gmail.com]

DEAR DR KARIM AND OTHER USERS,

I'M A NEW SWAT CUP USER,HAVE RUN A SWAT MODEL AND IMPORTED THE RESULTS TO SWAT CUP FOR CALIBRATION AND THE RESULTS OBTAINED ARE VERY BAD.

THE SIMULATIONS ARE A STRAIGHT LINE AND FAR FROM MEASURED DISCHARGE.WHAT COULD BE THE PROBELM.I HAVE VERIFIED THE RAINFALL DATA TO BE CORRECT,LAND USE ,SOIL MAPS ARE CORRECTED AND IM USING CFSR WEATHER DATA.

CAN SOMEONE HELP.ATTACHED IS THE PICTURE FOR 95PPU AS A STRAIGHT LINE.WHAT COULD BE WRON WITH THE CUP?

WAITING FOR YOUR ADVISE

GEORGE

[David]

You probably selected the wrong column number, so cup fetches area and not discharge

David Bispo Ferreira

Civil Engineer

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<SWAT_CUP REsults.png>

[George Zayeqa Ndhlovu]

Thank you David,

I have tried to use the daily measured discharge data, and not monthly data,the results are better.But there is still a huge difference between simulated and measured.How can achieve better results.I have run 200 simulations but no much improvement.Attached are the results for your advise.Strangely i have nothing in my echo file.

 

George

On 16 July 2018 at 16:22, David <davidfe...@gmail.com> wrote:

You probably selected the wrong column number, so cup fetches area and not discharge

David Bispo Ferreira

Civil Engineer

On 16 Jul 2018, at 05:39, georgezay...@gmail.com wrote:

DEAR DR KARIM AND OTHER USERS,

I'M A NEW SWAT CUP USER,HAVE RUN A SWAT MODEL AND IMPORTED THE RESULTS TO SWAT CUP FOR CALIBRATION AND THE RESULTS OBTAINED ARE VERY BAD.

THE SIMULATIONS ARE A STRAIGHT LINE AND FAR FROM MEASURED DISCHARGE.WHAT COULD BE THE PROBELM.I HAVE VERIFIED THE RAINFALL DATA TO BE CORRECT,LAND USE ,SOIL MAPS ARE CORRECTED AND IM USING CFSR WEATHER DATA.

CAN SOMEONE HELP.ATTACHED IS THE PICTURE FOR 95PPU AS A STRAIGHT LINE.WHAT COULD BE WRON WITH THE CUP?

WAITING FOR YOUR ADVISE

GEORGE

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<SWAT_CUP REsults.png>

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[Juan Sebastián Acero Triana]

What parameters are you changing? It looks like you have an excess of runoff. Try to reduce CN2 and then see how the model performs. Then change your GW parameters. Have a look at slides below. 

https://swat.tamu.edu/media/90112/swat-calibration-techniques_slides.pdf

Juan Sebastian Acero Triana

Graduate Research Assistant

Soil and Water Resources Engineering

Agricultural and Biological Engineering

University of Illinois at Urbana-Champaign

  

On Tuesday, July 17, 2018 at 1:58:50 AM UTC-5, George Zayeqa Ndhlovu wrote:

Thank you David,

I have tried to use the daily measured discharge data, and not monthly data,the results are better.But there is still a huge difference between simulated and measured.How can achieve better results.I have run 200 simulations but no much improvement.Attached are the results for your advise.Strangely i have nothing in my echo file.

 

George

On 16 July 2018 at 16:22, David <davidfe...@gmail.com> wrote:

You probably selected the wrong column number, so cup fetches area and not discharge

David Bispo Ferreira

Civil Engineer

On 16 Jul 2018, at 05:39, georgezay...@gmail.com wrote:

DEAR DR KARIM AND OTHER USERS,

I'M A NEW SWAT CUP USER,HAVE RUN A SWAT MODEL AND IMPORTED THE RESULTS TO SWAT CUP FOR CALIBRATION AND THE RESULTS OBTAINED ARE VERY BAD.

THE SIMULATIONS ARE A STRAIGHT LINE AND FAR FROM MEASURED DISCHARGE.WHAT COULD BE THE PROBELM.I HAVE VERIFIED THE RAINFALL DATA TO BE CORRECT,LAND USE ,SOIL MAPS ARE CORRECTED AND IM USING CFSR WEATHER DATA.

CAN SOMEONE HELP.ATTACHED IS THE PICTURE FOR 95PPU AS A STRAIGHT LINE.WHAT COULD BE WRON WITH THE CUP?

WAITING FOR YOUR ADVISE

GEORGE

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[Twite Daniel]

Dear Juan,

Normally in swat-cup, the parameter ranges are changed automatically e.g. you may begin with a range of -0.25 to 0.25 and after like 200 simulations you end with -0.18 to 0.21, how do you increase the curve in the next iteration?. Sorry for intervening in here but am also facing a problem calibrating my model.

[Juan Sebastián Acero Triana]

Each iteration (i.e. set of 200 simulations) produce new ranges of parameters, but you need to copy them to the Par_info file. You can modify the ranges as you want. I do not understand well whats your problem.

[Twite Daniel]

This is my initial model result. It follows the pattern but over estimates the flows. I think by reducing curve number it can lower the flows a little bit. How do i do that?. because I just know that I set the initial parameter ranges and the rest is done automatically.

[Juan Sebastián Acero Triana]

The first think that I would suggest is to get more familiar with the program reading the manual: https://swat.tamu.edu/media/114860/usermanual_swatcup.pdf

Are you sure you are running the pre-processing, run, and post-processing scripts and saving the results of each iteration (i.e. set of 200 or more simulations)?

[David]

George, 

Try first making a plan on what to change. Do sensitivity analysis and iterations. If you don’t get good results, you might be choosing a bad calibration scheme(i.e.: your parameters). SWAT-CUP allows hru and subbasin specific parameterization. Another option is SWAT being no bueno for your watershed with the available data. Your figure reminds me of my first model. I got 0.6 NSE values, but in my case watershed response is variable due to urban occupation and we have special aquifer conditions in upper regions. To us, it had be SWAT, because it works well for difuse pollution. I suggest you do some output analysis(swat output checker is a good program), check out Dr. Abbaspour work for inspiration and decide if you can live with your model limitations or you should try another one. Hope I helped

David Bispo Ferreira

Civil Engineer

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[George Zayeqa Ndhlovu]

Hi David and Swat Cup users,

i appreciate your advice,as the model is taking shape though not reached better results.Im actually using gridded weather data from Global weather data and have done a swat checker analysis and the results are good.I have tried to adjust the parameters sensitive such as CN2 and GWQMIN but there is little change.

I have also run more than 500 simulations but very little change.Im wondering if there is something im not doing right.Could you please look at the simulation attached and advise.

What should be the units for observed flow? is it m3/s in mm.Does the model make simulations in mm or m3/s.I have ready the manual but not all details are mentioned.

Im stuck need your quick guidance or atleast further direction.This is my first time to use SWAT and CUP.

Waiting

George

George, 

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