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http://dx.doi.org/10.3741/JKWRA.2009.42.11.897

The assessment of the relative contribution of the shape of instantaneous unit hydrograph with heterogeneity of drainage path  

Choi, Yong-Joon (Dept. of Civil Engrg., Chungnam National University)
Kim, Joo-Cheol (Researcher, Korea Institute of Water and Environment)
Kim, Jae-Han (Dept. of Civil Engrg., Chungnam National Univ.)
Publication Information
Journal of Korea Water Resources Association / v.42, no.11, 2009 , pp. 897-909 More about this Journal
Abstract
The relative contribution of between hillslope-flow and stream-flow by heterogeneity of drainage path are quantitatively assessed in the present study with GIUH model based on grid of GIS. Application watersheds are selected Pyeongchang, Bocheong and Wi river basin of IHP in Korea. The mean and variance of hillslope and stream length are estimated and analyzed in each watershed. And coupling with observation storm events, estimate hillslope and stream characteristic velocity which dynamic parameters of GIUH model. The mean and variance of distribution of travel time (i.e. IUH) calculate using estimated pass lengths and characteristic velocities. And the relative contributions are assessed by heterogeneity of drainage path. As a result, the effect of the variance that determine shape of IUH dominate with hillslope's effect in the small watershed area (within 500 $km^2$). Thus, GIUH in the small watershed area must consider hillslope-flow.
Keywords
GIUH; hillslope-flow; variance; moment; characteristic velocity;
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Times Cited By KSCI : 2  (Citation Analysis)
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