Quasi-three-dimensional Slope Runoff Model Taking Account of Topography of A Natural Watershed, and Automatic Generation of A Basin Model.

Abstract

This paper presents an automatic basin model generation system. The data to be inputted are height data on a regular grid which covers the basin and position and height data of channel network. The system produces a basin divide and subdivides the catchment into many small slopes taking streamlines (the steepest ascent lines) as dividing lines. Though in most cell methods developed to date for hydrologic application, the direction of flow is assumed to be parallel with axis, such assumption seems too simplistic in considering water-flow processes on three-dimensional catchment. The system presented here attaches importance to direction of water-flow. A quasi-three-dimensional slope runoff model to be coupled with this basin model is also presented.