Calibration and Sensitivity Analysis of the RICEWQ Model
2008
Chung, S.O. (Kyungpook National University, Daegu, Republic of Korea), E-mail: [email protected] | Park, K.J. (Rural Research Institute, Ansan, Republic of Korea) | Son, S.H. (Kyungpook National University, Daegu, Republic of Korea)
The main objectives of this study are to calibrate the RICEWQ model with Korean field data and then analyse the sensitivity of the parameters to identify sensitive parameters. The RICEWQ is widely used to predict pesticide fate in a paddy plot. An experimental paddy plot of 2.0 ha(100×20 m) at Seobyeon-dong, Daegu, Korea was selected, and field observations for water and pesticide balance were performed from 4 June to 2 September 2006. The molinate, which is a herbicide widely used for weed control in rice culture, was selected. The RICEWQ model was successfully calibrated both for the water and pesticide mass balance. The calibrated model showed a RMSE of 0.537 cm for ponded watere depths and a RMSE of 0.036 mg/L for the molinate concentrations in the ponded water. The most sensitive parameter for molinate concentrations in ponded water were the metabolism degradation rate in water, volatilization coefficient, and release rate for slow release formulations. In contrast, the RICEWQ model was not sensitive to parameters such as hydrolysis degradation rate in water and degradation rate in unsaturated soil.
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