ESTIMATION OF REPRESENTATIVE PARAMETER IN THE CHUNGJU DAM AREA, KOREA USING MODIFIED CLARK MODEL

摘要

Since 2000, the localized heavy rainfall has been frequently occurred in Korea and flood characteristic have been changed in watersheds. Therefore we may need the estimation of representative unit hydrograph for flood analysis considering the changed flood characteristics. This study derived the unit hydrograph using observed rainfall and inflow data for Chungju Dam watershed. We used Modified Clark Method which has two parameters of time of concentration, T_c and storage coefficient, K for the estimation of unit hydrograph. The parameters of rainfall events were estimated from the representative rainfall events of Chungju Dam watershed. As the result, we obtained the different parameters according to different rainfall events and this might show that the parameters had been influenced on rainfall events.