behavioral plot not showing observed data

[jcjaimes]

Dear Karim and fellows,

I want to calibrate streamflow of a model running 3 years at daily time steps. NS is the objective funtion.

When using a constant flow separtion (0.87), calibration results indicate a NS of 0.16. Behavioral 95ppu plot show observed and simulated values.

However, when I set dynamic flow (-1), NS drops dramatically to -2652, and behavioral 95ppu plot doesn't show observed values. Why might this suddenly decrease in NS? I checked summary stats that indicates observed mean of 0.0 for the these results. How is this possible? I've checked Observed_rch.txt and Observed.txt files and both looked ok to me.

I've read the posts regarding baseflow separation and dynamic flow, and still wondering what is happening when using the dynamic flow separation in my project.

Thanks ,
Juan Carlos

[jcjaimes]

Dear SWAT community,
Someone who can answer my inquire?

Thanks,
J

[Karim]

How do you set the dynamic flow?

Karim

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[jcjaimes]

Dear Karim,

I set as follows and also shown in figure "Observed txt - dynamic flow.JPG" above.

FLOW_OUT_52   : this is the name of the variable and the subbasin number to be included in the objective function
1     : weight of the variable in the objective function
1    : Dynamic flow separation. Not considered if -1. If 1, then values should be added in the forth column below after observations
-1    : constant flow separation, threshold value. (not considered if -1)
1     : if separation of signal is considered, this is weight of the smaller values in the objective function
1     : if separation of signal is considered, this is weight of the larger values in the objective function
10    : percentage of measurement error
1096   : number of data points for this variable as it follows below. First column is a sequential number from beginning
      : of the simulation, second column is variable name and date (format arbitrary), third column is variable value.

1    Q19920101    0.425    0.212
2    Q19920102    0.425    0.228
3    Q19920103    0.453    0.244
4    Q19920104    0.481    0.261
etc.


Regards,
Juan

[Abbaspour, Karim]

Not sure what there would be such as big difference.

Karim

[jcjaimes]

Dear Karim,
I've found that the file "95ppu_g.txt" contains the actual observed flows (second column) in the first (1096 days) lines:

Stname  observed          L95PPU          U95PPU        Best_Sim
FLOW_OUT_52     0.425000        0.008977        1.073350        0.054900      
FLOW_OUT_52     0.425000        0.009008        1.072408        0.054900      
FLOW_OUT_52     0.453000        0.009022        1.071465        0.054900      
FLOW_OUT_52     0.481000        0.009115        1.071470        0.055000      
FLOW_OUT_52     0.481000        0.009188        1.070531        0.055000 

etc...

But, after the 3rd row of behavioral results, there is mostly zeros in observed flow (second column), Also, upper and lower 95PPU (3 and 4 columns) have same values as the Best simulation (5 column):

---
FLOW_OUT_52     0.878000        1.346631        3.228688        1.609000      
FLOW_OUT_52     0.736000        1.343631        3.225688        1.605000      
beh_FLOW_OUT_52     0.425000        0.054930        0.054930        0.054900      
beh_FLOW_OUT_52     2.000000        0.054940        0.054940        0.054900      
beh_FLOW_OUT_52     0.000000        0.054930        0.054930        0.054900      
beh_FLOW_OUT_52     0.000000        0.054980        0.054980        0.055000      
beh_FLOW_OUT_52     0.000000        0.055010        0.055010        0.055000      
beh_FLOW_OUT_52     0.000000        0.055050        0.055050        0.055100    
etc...

Regards,
Juan

[jcjaimes]

I used the SWAT BFlow filter program to estimate the baseflow within the time frame of my study.

Juan