PROPOSAL OF FLOOD RIVER LEVEL MODEL THAT IS EASY TO CREATE AND ITS VERIFICATION OF HYDROGRAPH REPRODUCIBILITY

Abstract

 We proposed a river level model that is easy to create. From the frequency distribution of all water level data, the data above the threshold is adopted and used for parameter setting without taking the idea of using the hydro-hyet relationship for each flood event. The runoff function method is adopted as the basic equation, and the water level response function corresponding to the runoff function is an exponential function in which the time delay is explicitly considered. Coefficients for each rain gauge are introduced, and rainfall observation stations that explain the water level observation data of interest are selected.

 It was found that good hydrograph reproducibility was shown with accuracy equal to or better than the Hoshi storage function model, and the effectiveness of the proposed method was clarified.