Numerical Simulation of Rainfall-runoff for Small-scale Basin

The distributed hydrological model of rainfall-runoff for the two small scale basins of the different topographic conditions were developed for the main objective to provide method reference for the further studies on distributed hydrological model of the small-scale basin. The Liudaogou Basin located at hilly-gully area of the northern Loess Plateau and Bukuro River Basin located at mountain area of the Tottori County of Japan were adopted as the studied locations. Modeling of soil vertical profile of the studied locations was conducted based on the field survey; the numerical model for rainfall-runoff was developed based on the equations of kinematic wave theory combined with GIS-ArcMap; Applicability of the model was validated through numerical simulation of the observed runoff process. The results indicated that the simulation results exhibited relatively high precision, and the error was less than 3%. A scientific method for surface runoff estimation was therefore provided for the studied locations.