Usage of two Objective functions at the same time

[Gokul Kanneganti]

Hi Dr.Karim and SWAT-CUP Users,

Is there any way, where i can use two objective functions(let's say R2 and NS) at the same time for calibration of the model. It would be helpful if anybody could reply to this thread.

Thanks and Regards,

Gokul 

[Abbaspour, Karim]

No. Do you have any references on this? I don't see how this is meaningful when r2 has a value between 0 and 1, whereas ns can change between - infinity and 1? 

I would just use br2.

Karim

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[Gokul Kanneganti]

Thank you for quick reply Dr.Karim. 

Usually when we use flows from any hydrological model for flood prediction we don't want to miss the peak flows while calibrating the model on a daily basis and also on the other hand we don't want to miss the threshold of NS value (0.6 or 0.7). So, Normalized RMSE = RMSE/mean(Q-observed) is also taken as a constraint along with our defined objective function. Since, NS is estimated using daily observed and simulated flows It may be misleading sometimes. So Normalized RMSE is also considered as a pseudo-objective function in many scenarios.

Regards,

Gokul

[Karim Abbaspour]

OK, a constraint is possible. In the next version I am adding a number of constraints to the objective function. I can consider this also.

I can also add normalized RMSR as an objective function. But they are not there yet. Hopefully in the near future.

Karim

 

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From: Gokul Kanneganti <goku...@gmail.com>
To: SWAT-CUP <swat...@googlegroups.com>
Sent: Tuesday, September 20, 2016 2:18 PM
Subject: Re: Usage of two Objective functions at the same time

[Gokul Kanneganti]

Thankyou for your update Dr.Karim.

Regards,

Gokul