表面流の3Dシミュレーション

Abstract

本研究は，円筒をGISのフローエレメント(FE)とし，表面流を3次元的に表現する．円筒の高さは表面流の流速に比例し，その角度は表面流の流れの方向に，その直径は表面流の高さに比例する．また，円筒の色は土砂濃度に比例する．提案する手法を中国の黄土高原に適用し，それぞれのピクセルにおける表面流の流速と方向の変化をシミュレートする．

In this research, overland flow is simulated based on GIS Flow Element (FE), which is represented by a fine cylinder. The height of the cylinder is in direct proportion to the velocity of overland flow; the inclination of the cylinder represents the direction of the movement; the diameter of the cylinder is in direct proportion to the depth of overland flow; and the depth of cylinder color is related to sediment concentration. The deeper the cylinder color is, the greater sediment concentration it represents. Via collecting data from a watershed in China Loess Plateau region and selecting geoscientific models, we simulate the dynamic change of velocity and direction of overland flow in each pixel.