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http://dx.doi.org/10.3741/JKWRA.2014.47.12.1121

Sensitivity Analysis and Parameter Evaluation of a Distributed Model for Rainfall-Runoff-Soil Erosion-Sediment Transport Modeling in the Naesung Stream Watershed  

Jeong, Won Jun (Hydro-lab, Dept. of Civil and Environmental Engineering, Myongji Univ.)
Ji, Un (River and Coastal Research Division, Water Resources & Environment Research Department, Korea Institute of Civil Engineering and Building Technology)
Publication Information
Journal of Korea Water Resources Association / v.47, no.12, 2014 , pp. 1121-1134 More about this Journal
Abstract
The distributed watershed model of rainfall-runoff-soil erosion-sedimen transport was constructed for the Naesung Stream Watershed with high potentiality and risk of sediments produced by soil erosion. The sensitivity analyses of roughness coefficient and hydraulic conductivity which affected the modeling results of runoff and sediment concentration were performed in this study. As a result, the change of the roughness coefficient for the forest area from 0.4 to 0.45 did not affect the change in runoff and stream discharge and the average value and range of sediment concentration were also insignificantly increased with few difference. As a result of the sensitivity analysis of the hydraulic conductivity, the total amount of runoff and maximum runoff were gradually increased as the hydraulic conductivity was reduced. In the case of sediment concentration modeling, the average and the range of sediment concentration for all stations were increased as the hydraulic conductivity was decreased. For the Hyangseok Station, in case of the hydraulic conductivity reduced by 50%, the simulation result of sediment concentration was most similar to the estimated value by the sediment rating curve.
Keywords
hydraulic conductivity; roughness coefficient; sediment transport; sensitivity analysis; soil erosion; watershed model;
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Times Cited By KSCI : 4  (Citation Analysis)
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