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http://dx.doi.org/10.3741/JKWRA.2008.41.5.491

Runoff Analysis for Urban Unit Subbasin Based on its Shape  

Hur, Sung-Chul (Department of Civil Engineering, Kyonggi Univ.)
Park, Sang-Sik (Department of Civil Engineering, Kyonggi Univ.)
Lee, Jong-Tae (School of Civi and Environmental Engineering, Kyonggi Univ.)
Publication Information
Journal of Korea Water Resources Association / v.41, no.5, 2008 , pp. 491-501 More about this Journal
Abstract
In order to describe runoff characteristics of urban drainage area, outflow from subbasins divided by considering topography and flow path, is analyzed through stormwater system. In doing so, concentration time and time-area curve change significantly according to basin shape, and runoff characteristics are changed greatly by these attributes. Therefore, in this development study of FFC2Q model by MLTM, we aim to improve the accuracy in analyzing runoff by adding a module that considers basin shape, giving it an advantage over popular urban hydrology models, such as SWMM and ILLUDAS, that can not account for geometric shape of a basin due to their assumptions of unit subbasin as having a simple rectangular form. For subbasin shapes, symmetry types (rectangular, ellipse, lozenge), divergent types (triangle, trapezoid), and convergent types (inverted triangle, inverted trapezoid) have been analyzed in application of time-area curve for surface runoff analysis. As a result, we found that runoff characteristic can be quite different depending on basin shape. For example, when Gunja basin was represented by lozenge shape, the best results for peak flow discharge and overall shape of runoff hydrograph were achieved in comparison to observed data. Additionally, in case of considering subbasin shape, the number of division of drainage basin did not affect peak flow magnitude and gave stable results close to observed data. However, in case of representing the shape of subbasins by traditional rectangular approximation, the division number had sensitive effects on the analysis results.
Keywords
basin shape; urban runoff; time-area curve; FFC2Q; ILLUDAS;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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