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http://dx.doi.org/10.3741/JKWRA.2008.41.11.1107

Comparison of IUHs obtained by the Derived and Simple Equation of GIUH on Third and Fourth-Order Streams  

Joo, Jin-Gul (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Ham, Dae-Heon (System Development Dept., Websolus, Co., LTD)
Jun, Hwan-Don (Dept. of Civil, Environmental and Urban Engrg., Hanbat National Univ.)
Lee, Jung-Ho (Research Center for Disaster Prevention Science and Technology, Korea Univ.)
Kim, Joong-Hoon (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of Korea Water Resources Association / v.41, no.11, 2008 , pp. 1107-1121 More about this Journal
Abstract
The simple equation of GIUH are frequently used in many researches instead of the derived equation of GIUH. However it is still unknown whether the simple equation of GIUH is adaptable for estimating IUHs for basins with various geomorphologic conditions. To verify the applicability of the simple equation of GIUH, in this research, four basins which were Bangrim, Sanganmi, Museong, and Byeongcheon were selected and each basin was assumed as the third and fourth stream order basin according to variable resolutions. After than, IUHs were estimated using the derived and simple equations of GIUH. Eight to sixteen hydrographs were estimated from the each IUH, compared with observed graphs. In case of that the basin is assumed as a third order stream, the derived equation underestimated the peak flows while the simple equation overestimated them. When the basin is assumed as a fourth order stream, the simple equation generally overestimated the peak flows whereas the derived equation produced peak flows good agreement with the observed peak flow. Moreover, the simple equation showed various deviations in accuracy whereas the derived equation produced stable results. Based on the fact found from this research, it can be concluded that the derived equation of GIUH brings better results than the simple equation of GIUH to estimate IUHs for ungauged basins.
Keywords
GIUH; Stream Order; Simple Equation; Unit Hydrograph; Resolution;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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