Dear researchers,
I used SWAT-CUP to calibrate the discharge and then fix the discharge-related optimized parameter values to calibrate the sediment-related parameter subsequently. I fixed the optimized discharge and sediment related parameter values to run SWAT-CUP again. Then I copied all the files under the ×××Sufi2.SwatCup folder to replace the files in SWAT TxtInOut folder under default folder. After running SWAT, the sediment result is greatly different from SWAT-CUP result, although the discharge result is nearly same to the SWAT-CUP.
Why it happened? Is there any solution? I would be grateful if you have any suggestions.
Hello Renhua,
Did you try change SPEXP and SPCON within the ranges stipulated?
This could happen. There can be several reasons which I suspect. This might be because on some of the days where you have high sediment loads see whether your simulated streamflow is also high? If simulated flow is still low this is the reason.
Did you reheck check the units of SWAT model sediment out put and observed sediment yield?
Based on my experience in sediment yield calibration, I would suggest you to focus more monthly loads rather than daily or much finer time resolutions.
Thanks for your good suggestions. After careful checking, 1)SPEXP and SPCON were adjusted within the ranges stipulated; 2) The peaks of sediment loads agreed with those of water yield and the simulated flow also tracked the magnitude of observed flow; 3) both the units of SWAT model sediment output and observed ones were metric ton.
So I am still confused with this problem.
Hi Renhua,
I am also wandering why it's still the same then.
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