Author(s): H. Leej; Hurj; D. H. Lee; E. T. Lee
Linked Author(s): Do Hun Lee
Keywords: Sensitivity analysis; Sensitivity index; Critical rainfall duration
Abstract: In this study, the sensitivity indexes of four hydrologic parameters such as return period, rainfall distribution, soil moisture condition and time of concentration were determined by applying Watershed Modeling System (WMS) program. The objective is to identify the important factors that have influence upon the critical rainfall duration. The study site is the Yang Hwa River basin which is the first tributary of the Nam-Han River in Korea. The sensitivity indexes of critical rainfall duration for 9 locations in the Yang Hwa River basin are estimated by varying four factors of return period, rainfall distribution type, soil moisture condition and time of concentration. The average sensitivity index resulted from varying antecedent soil moisture condition exhibits the lowest value and the average sensitivity index calculated from varying return period is the highest value. Hence, the sensitivity analysis suggests that the most important factor for affecting critical rainfall duration is the antecedent soil moisture condition.
Year: 2003