Journal of the Japan Society of Erosion Control Engineering, Vol.55,No.6,p.33-39,2003

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Model of sediment runoff process using triangle scheme

Kuniaki MIYAMOTO, Syunsuke IDO

Abstract

Run off process in watershed has to be discussed in both of water and sediment to manage and preserve the watershed land and environment. We proposed a watershed runoff model using triangle elements in this paper. The watershed is covered by triangles which form a point]polygon system. The points, a set of three points, compose a triangle, and the gravity centers of triangles around a point compose a polygon. The topography and strata structure are explained by the elevations of ground surface and boundary of each stratum at each point. The depth of the flow is defined at each point, and the flux is defined at the gravity center of each triangle, which is a vertex of a polygon. Based on the arrangement of variables, two]dimensional runoff analysis can be done using kinematic wave theory and also calculate sediment yield and the runoff process. We also demonstrate an example of calculation in this paper.

Key words:Run]off process, Sediment yield, Sediment run]off