National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Calibration and validation are the two important processes needed to perform for physically based distributed watershed models before their use for hydrologic calculations. The present study was conducted to calibrate the SWAT model for Kunthipuzha basin using SUFI-2 algorithm in SWAT-CUP package. SUFI-2 algorithm accounts for most sources of uncertainties and it is also easy to handle. By considering these advantages and based on recommendation of many researchers, Sequential Uncertainty Fitting procedure (SUFI-2) was selected in this study for sensitivity analysis, calibration and validation of the model. SUFI-2 also got provision for performing both type of sensitivity analysis such as one-at-a time and global sensitivity analysis. In this study, both one-at-a time and global sensitivity analysis was conducted. Calibration was done for a period of 7 years starting from 2000 to 2006, whereas, validation was done for a 3 year period starting from 2007 to 2009. The values of statistical indices such as NSE and R2 were 0.81, 0.82 for calibration period and 0.73, 0.88 for validation period respectively which indicates the “very good” performance of the model in simulating hydrology. The p-factor and r- factor were 0.69 and 0.47 for calibration period, 0.57 and 0.51 for validation period respectively. SUFI-2 was found to be very convenient and easy to use than the other automatic calibration techniques.
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