The difficulties involved in calibration of physically-based erosion models have been partly attributable to the lack of robust optimization tools. Recently, a global optimization method known as the SCE-UA has shown promise as an effective and efficient optimization technique for calibrating watershed models. This paper presents the essential concepts of the SCE-UA method and a physically-based erosion model, and then presents the optimization results in which the WESP model was calibrated. On

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... the basis of these results, the recommended erosion parameter values are given, which should also help to provide guidelines to estimate them in other similar areas.