1998•Journal of the Korean Society of Civil EngineersRequires access

The Sensitivity Analysis of Urban Runoff Model Parameters due to Variation of Rainfall Duration

Kyu-Woo Seo, Mun-Mo Kim

Abstract

In this study, in order to analyze the parameter sensitivities of CHICAGO hydrograph method, ILLUDAS SWMM, total runoff ratio, peak runoff ratio, runoff sensitivity ratio, sensitivity ratio of total runoff, and sensitivity ratio of peak runoff were defined. And these ratios were estimated based on the scale of basin area, rainfall distributions and rainfall durations. Total runoff ratio for almost Parameters turned out to have a linear relation to the rainfall durations and the scale of basin area but have nothing to do with rainfall distributions. While the peak runoff ratio for the parameter of CHICAGO hydrograph method turned out not to have a trend for the scale of basin area. rainfall duration and rainfall distributions, it turned out to have a linear relation for the infiltration and soil parameters of ILLUDAS as well as all parameters of SWMM.

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Key concepts: Surface runoff, Hydrograph, Runoff model, Environmental science, Hydrology (agriculture), Runoff curve number, Infiltration (HVAC), Sensitivity (control systems)