Parameters optimization based on the combination of localization and auto-calibration of SWAT model in a small watershed in Chinese Loess Plateau |
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| Authors: | Changbin Li Jiaguo Qi Zhaodong Feng Runsheng Yin Songbing Zou and Feng Zhang |
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| Institution: | (1) Department of Geography and Environmental Engineering, The Johns Hopkins University, Ames Hall 313, 3800 No. Charles St., Baltimore, MD 21218, USA |
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| Abstract: | This study simulated the watershed flow and sediment responses based on calibration of the SWAT model in the semi-arid Chinese
Loess Plateau (LP) where soil erosion intensively occurs. After the model’s initiation and manual modification, a 7-year inconsecutively
observed flow and sediment data from 1984 to 1990 was used to analyze the model’s application in the selected watershed called
AJW in the Chinese LP region. The model procedure included sensitivity analysis, parameter calibration and model validation.
The best parameter set was finally determined based on the combination of parameter localization and auto-calibration. Then
the model was assessed for its accuracy based on the NSE estimation, resulting in 0.77 and 0.67 for calibration and 0.46 and
0.32 for validation on simulations for flow and sediment, respectively, which is a moderately satisfactory accuracy among
the applications of the SWAT model. Annual watershed assessment on flow and sediment with the calibrated SWAT model resulted
in a multiyear averaged annual runoff coefficient of about 2.7% and an erosion modulus of 797 t/(km2·a?1) in the AJW, indicating a beneficial consequence from the implementation of the historical soil and water conservations. |
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