Comparison of single-site, multi-site and multi-variable SWAT calibration strategies

Ana Clara Lazzari Franco, Debora Yumi De Oliveira, Nadia Bernardi Bonumá
This study compares single-site, multi-site and multi-variable SWAT calibration. The SWAT model was applied to a large basin (63 884 km2) and calibrated at a monthly time step with the SUFI-2 algorithm, using the Kling-Gupta efficiency (KGE) as the objective function. Multi-variable calibration was performed by combining streamflow and remote sensing-derived actual evapotranspiration data. Parameter transferability was also investigated, by daily time step validation. The KGE for the outlet
more » ... for the outlet ranged from 0.73 to 0.86, and the average KGE of all streamflow gauge stations ranged from 0.73 to 0.80, reflecting a good overall simulation performance for the monthly time step. In daily time step validation, KGE ranged from 0.62 to 0.68, and the Nash-Sutcliffe efficiency ranged from 0.40 to 0.60, for the average of all gauge stations. Multi-site and multi-variable calibrations did not significantly improve inner sub-basin simulation performance but improved streamflow uncertainty when compared to single-site calibration.
doi:10.6084/m9.figshare.12854066.v1 fatcat:q4cfwxtfdzgw5banefghms3fci