Estimation of Synthetic Unit Hydrograph by Cluster Analysis Using Geomorphic Characteristics of Mid-size Watershed

Title & Authors
Estimation of Synthetic Unit Hydrograph by Cluster Analysis Using Geomorphic Characteristics of Mid-size Watershed
Kim, Jin Gyeom; Kim, Jong min; Kang, Boosik;

Abstract
The methodology of synthetic unit hydrograph using geomorphic characteristics was suggested. Six geomorphic components over 19 watersheds were used to estimate synthetic unit hydrograph and the test watersheds were classified into two groups on the basis of the area of $\small{200km^2}$. The regression formulas between standardized geomorphic characteristics for each group and peak quantities of specific streamflow and time of representative unit hydrograph were suggested and the Nash and the Clark unit hydrographs were derived. For verifying the derived unit hydrographs, the resulting hydrographs were compared with the ones using the existing Clark unit hydrographs based on the empirical parameter estimation for the 145 storm events during 2010 to 2011 for the additional six watersheds. The results showed the relatively higher performance over the existing synthetic unit hydrograph methods, which could be a contribution to the hydrologic estimation in ungauged watersheds.
Keywords
Synthetic unit hydrograph;Nash model;Clark model;Geomorphic characteristics;Shape factor;
Language
Korean
Cited by
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