RUNOFF SIMULATION IN SMALL AND MEDIUM-SIZED RIVERS USING DIGITAL ELEVATION MODELS WITH DIFFERENT SPATIAL RESOLUTIONS

Abstract

 In recent years, with the increase in extreme rainfall, floods of small and medium-sized rivers have occurred frequently.We focused on a small and medium-sized river (155 km²) and conducted runoff simulation using four digital elevation models (Asia 30, Asia15, fifth-order mesh, and Japan Flow Direction Map (JFDM)) with different spatial resolutions. As a result, JFDM with a spatial resolution of 77 m x 92 m (three times scale-up) gives high values for both the Nash-Sutcliffe coefficient and the correlation coefficient.