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http://dx.doi.org/10.12652/Ksce.2011.31.1B.047

Suggestion of Synthetic Unit Hydrograph Method Considering Hydrodynamic Characteristic on the Basin  

Kim, Joo Cheol (한국수자원공사 K-water연구원)
Choi, Yong Joon (충남대학교 토목공학과)
Jeong, Dong Kug (한남대학교 건설시스템공학과)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.31, no.1B, 2011 , pp. 47-55 More about this Journal
Abstract
This study suggests new synthetic unit hydrograph method considering hydrodynamic characteristic on the basin. The suggested method based on width function GIUH, and the procedure is summarized as follows; 1) Draw up a travel distance distribution map (width function) which is raster of length between from center of individual cells to the outlet by GIS. 2) Calculation of travel time distribution map (rescaled width function) by hydrodynamic parameters and travel distance distribution map. 3) Derivation of IUH and Duration UH from rescaled width function. 4) Comparison of shape of UH between suggested method and existing synthetic unit hydrograph methods. The target basins are selected Ipyeong and Tanbu subwatershed in the Bocheong Basin. The target basins are similar scale (watershed area), but different drainage structure (drainage density et al.). Therefore we anticipate that there are different hydrologic response functions because different hydrodynamic characteristics. As a result of derivation of UH, existing synthetic unit hydrograph methods are similar shape of UHs about Ipyeong and Tanbu watersheds, but the suggested method is different shape of ones. As a result of application to observed data, the peak discharge by suggested method is similar to existing synthetic unit hydrograph methods, but the peak time is well correspondence between those. Henceforth, if the suggested method combines with the rational velocity estimation method, it is useful method for synthetic of UH in ungauged watershed.
Keywords
GIUH; synthetic unit hydrograph; travel time distribution; width function;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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