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You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME A: Engineering and Management of Fresh-water Systems : Application of storage function method with scs abstraction method
Application of storage function method with scs abstraction method
Author : Taegyun Kim , Kanghoon Yoon
The flood forecasting and warning in Korea was first introduced by the flood forecasting and warning survey conducted by Japan International Cooperation Agency(JICA) during 1972(1st) 1977(5th). JICA had considered Unit Hydrograph, Tank Model, etc., for runoff model, and finally adopted the Storage Function Method(SFM). Since the proposal of flood forecasting and warning system using Storage Function Method by JICA, the system has been implemented in the Han River Flood Control Office in July 1974, and afterwards, extended to five large rivers, small and medium size rivers(KMOCT, 1998). The parameters of models have been continually readjusted to reflect the changes in runoff characteristics according to the industrialization and urbanization. As the rainfall-runoff model for flood forecasting, the SFM was selected because the nonlinear characteristics of flood runoff can be taken into consideration, in addition to its simplicity of calculation(JICA,1977). The work of readjusting parameters is based on the accuracy of a lot of rainfall-runoff records and data, however, it is not easy to obtain accurate parameters due to the non-linear relationship of rainfall-runoff, the inaccuracy in the levelflow relation curve and errors in observation instruments. The SFM can be divided into effective rainfall calculation, watershed routing model, and channel routing model. In the calculation of the effective rainfall, basin was divided into runoff area and percolation area and linear function was used to calculate the effective rainfall. It is not easy to derive this from rainfall-runoff event. In addition, the effective rainfall calculation method using linear function shows difference from the non-linear infiltration capacity function proposed by Horton, Philip, and Holtan(Chow et. al, 1988). In this study, the effective rainfall calculation method of SFM, assumed to be a linear function, was substituted with the SCS Abstraction Method which can be easily applied in ungaged watershed to evaluate the applicability of the SFM.
File Size : 175,857 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 32nd Congress - Venice (2007)
Article : THEME A: Engineering and Management of Fresh-water Systems
Date Published : 01/07/2007
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