2002 Volume 46 Pages 157-162
Two-dimensional runoff analysis with rect-linear finite differential scheme or one-dimensional runoff analysis with more complex finite differential scheme has been studied. We propose triangle scheme that covers ground surface to make a numerical model of the ground surface topography and strata structure. The ground surface is covered by point-polygon system and the vertexes of a polygon are defined at the gravity centers of triangles surrounding the point. The topography and strata structure are explained by the elevation of ground surface and boundary of each stratum. The depth is defined at the point and the flux is defined at the gravity center of the triangle. Based on the arrangement of variables, two-dimensional runoff analysis can be done. We apply kinematic wave theory to the triangle scheme and show an example of calculation.
