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http://dx.doi.org/10.3741/JKWRA.2008.41.2.229

Study on Derivation of Fourth-Order GIUH and Revision of Initial State Probability  

Ham, Dae-Heon (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Joo, Jin-Gul (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Jun, Hwan-Don (Dept. of Civil, Environmental and Urban Engrg., Hanbat National Univ.)
Kim, Joong-Hoon (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of Korea Water Resources Association / v.41, no.2, 2008 , pp. 229-239 More about this Journal
Abstract
This study is to derive the fourth-order Geomorphologic Instantaneous Unit Hydrograph (GIUH), driven for only third-order basin, for the application of GIUH to various types of basin. The second, third, and fourth order GIUHs were compared for various topographical conditions. The results showed lower peak runoff and later peak time in GIUH with higher stream order. Initial state probability was estimated from a function of geomorphologic parameters such as area ratio and bifurcation ratio for the application of GIUH. However, initial state probabilities and early parts of the GIUHs have negative values for many basins due to the inherent errors in the parameters. Initial state probability was calculated by area ratio of direct drainage using ArcView GIS 3.2 model to solve the problem. GIUHs were estimated for three basins, Sanganmi, Byeongcheon, and Sangye, using the above suggested method, and the results showed that the method is free of the problem.
Keywords
GIUH; Initial State Probability; Stream Order; Unit Hydrograph; Fourth order;
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Times Cited By KSCI : 3  (Citation Analysis)
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