EFFECT OF TOPOGRAPHIC RESOLUTION ON RUNOFF ANALYSIS DISCRIBED BY QUADTREE GRID SYSTEM

Abstract

 Since the required topographic resolution for runoff analysis is unknown, we used a runoff analysis method using a quadtree grid to compare runoff characteristics at different topographic resolutions and analyze their effects. Comparisons were also made with the RRI model and with methods that treated the river channel in one dimension. It was shown that improving the topographic resolution of the river channel by means of a quadtree grid improves the reproducibility of the water level hydro, and that the topographic resolution of the river channel contributes significantly to the runoff volume estimation. It was suggested that differences in topographic resolution in the mountains as well as in the river channel affect the amount of runoff.