simulated flow tends to zero

[Gwenola Plougoulen]

Hello everyone,

I run my model and got this figure when comparing simulated flow (blue) with observed flow (orange).

Pearson coef = 0,35

NSEC = -0,32

I notice that simulated flow is very variable and tends to zero m3/s almost every two days. 

Could anyone explains this ? 

Which parameter should I adjust for a better simulation ?

In advence, thank you for any advice !

Gwen

[Osvaldo Luis BARRESI]

Hello Gwenola,

I would look at your aquifer parameters:

In the aqu.aqu file, look at dep_bot (height of the aquifer) and set flo_min to this value, so you can have an aquifer response (in math terms dep_bot = flo_min).

Then you need to set a realistic sp_yld value, I don't know your zone, but let's suppose that you don't have a shallow aquifer, so a sp_yld between 0.1-0.15 should sustain enough aquifer flow. 

After, try to set a realistic percolation for your zone. Once you feel like you're percolating well, try different alpha values (you can run the baseflow program which is in the SWAT website)

Good luck

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Osvaldo Luis Barresi
Doctorant en modélisation hydrologique et changement climatique

Laboratoire Ecologie Fonctionnelle et Environnement
Université Toulouse III - Paul Sabatier
UMR 5245 - CNRS - UPS - INPT

Tél : +33 (0)7 81 46 45 95

mail. osvaldo-luis....@univ-tls3.fr