[HELP] How to increase the simulated results?

[tic...@gmail.com]

Dear All,

I have calibrated my swat model and got really poor results. The simulated values are always much lower than the observed. I have unpacked print log flow. What can I do to adjust the parameters? Thank you a lot.

Ticy

[Abbaspour, Karim]

As I always write, look at your initial model result. If it is too different from observations, don’t bother to calibrate, look at what is happening  in the watershed and the processes you are not accounting for, integrity of your discharge and rainfall data, etc. Those huge discharges are not as the result of rainfall.

 

Karim

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[tic...@gmail.com]

Thank you Karim. I will go back to check my observed data.

[tic...@gmail.com]

Dr. Abbaspor,

I have checked my file and found that it was because I used a wrong subbasin number. 

Also, may I ask several basic questions about calibration? I want to simulate daily streamflow. Then when I do calibration, do I need to do monthly first? And can I apply the monthly calibrated parameters to daily simulation? Last question, can I use the average monthly streamflow for calibration or is there any method to calculate?

Thank you very much!

Ticy

On Thursday, July 13, 2017 at 10:37:42 PM UTC+8, Abbaspour wrote:

[Abbaspour, Karim]

I want to simulate daily streamflow. Then when I do calibration, do I need to do monthly first?

 

-       You can, to get a better idea of the watershed-level values, but it is not necessary

 

 

And can I apply the monthly calibrated parameters to daily simulation?

 

-       No, not directly. You still need to recalibrate the parameters at the daily level

 

 

 

Last question, can I use the average monthly streamflow for calibration or is there any method to calculate?

 

 

-        Yes, you can use average monthly flow to calibrate. You can use any output of SWAT to calibrate

[tic...@gmail.com]

Dr Abbaspour,

Thank you very much for your detailed answer! 

Now I'm trying a 3-year daily calibration, and the model can't continue after the first simulation which is shown in the attachment. Do you have any idea what may cause such a situation? Thank you again. 

Ticy

[Karim Abbaspour]

probably you have a problem in the extraction file. Perhaps the number of data points or the timing in your files are not correct.

Karim

 

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From: "tic...@gmail.com" <tic...@gmail.com>
To: SWAT-CUP <swat...@googlegroups.com>
Sent: Friday, July 14, 2017 1:20 PM

Subject: Re: [HELP] How to increase the simulated results?

[Kailey]

Dr Abbaspour

After set up my model, I ran SWAT Check, it warning  Groudwater ratio may be low and Lateral flow is greater than groundwater flow. What might be indicate a problem? And I had calibration with SWAT-CUP, the results showed that the  baseflow too low and the peak too high, and then I adjusted parameters depend on the calibration protocol(Abbaspour,2015), it did not work. How should I check my initial model?  I have struck with the problem for a long time. Hope to get your help!

Looking forward to your reply!

Thanks in advance!

Kailey

在 2017年7月13日星期四 UTC+8下午10:37:42，Abbaspour写道：

[isma]

Hi 

I faced a similar problem, I got underestimated discharge and also some peak value when I just change the type of saving during the modeling. Same data and process of calibration I've used. 

 Also, I got these type of graph, seem to be different in the sample of manual. I wanna see line graph for all sample, but in my results, it seems to be a column type of graph in simulated value. 

How to fix this? 

Regards

Ismail