PARAMETER IDENTIFICATION OF RUNOFF MODEL USING RAINFALL AND WATER-LEVEL DATA

This paper proposes a parameter identification method of runoff model and an estimation method of discharge in small rivers of which water-levels are observed. The calculation procedures are as follows. First, the runoff calculation is carried out with the distributed runoff model proposed by authors using the rainfall data observed in and around the basin. Then, the water-level hydrograph is estimated at the water-level observation site, by applying the H-Q parameter model to calculated discharge. Finally, the optimum solutions of parameters included for the two models are searched in order to reproduce observed water-level hydrograph. The proposed method was applied to some floods observed at two small rivers. As the result, water-level hydrographs, peak discharges, and H-Q curves were well able to estimated by the method.