| The kinematic wsve and storage routing models have been extensively used for flood runoff analysis in both of basin and channel systems．Even though rainfall and geophysical parameters(e．g.，slope length，gradient and roughness coefficient)are explicitly reflected in model parameters of the kinematic wave method，computational burdens are stringent in larger river basins consisting of many subbasinsand relatively ong channel systems．[*]On the other hand，the storage routing model has been almost exclusively used in Japan，because of its computational simplicity and promptness required in operational forecasts．However，the parameters involved in the storage routing mode I have been usually determined empirically in hydrologic practices．[*]The storage routing model adopted in the present study is the retically transformed from the solution of the kinematic wave model in which accurate linkages are maintained between the parameters of two models．[*]The proposed modelis applicable to rainfall-runoff analysis in the subbasins and flood propagations in the channels．The proposed model is applied to flood runoff data in the Uryu River basin，tributary of the Ishikari River in Hokkaido，Japan in which the entire river system is divided into 14 subbasins and 7 channel reaches．The three parameters in the basin model are optimized via use of the Newton-Raphson method in which sensitivity coefficients(first derivatives)are analytically derived．The simulation resultsclearly show that the proposed storage routing model provides a fairly good reproduction of flood hydrographs，when the flood flows are routed through both of subbasin and channel phases． |
