基于FLO-2D模型的泥石流运动冲淤数值模拟

Numerical simulation of erosion and deposition debris flow based on FLO-2D Model

采用2维流变模型FLO-2D,经连续方程与运动方程,结合网格化的数字高程模型,选取陇南市武都地区清水沟、嘴子沟及段河坝3条泥石流沟为试验区.通过DEM在ArcGIS中转换为ASCⅡ格式输入至FLO-2DPRO软件中,建立流域模型,分析计算出各网格点的可能运动速度、淤积深度,并将模拟结果整合致GIS中.在GIS软件中分析可能淤积范围,通过对比2010年陇南"8.12"特大暴雨事件引发泥石流灾害灾情,验证了FLO-2D模型模拟试验区泥石流威胁范围的正确性,发现模拟结果与实际发生灾情威胁范围大致相符.

According to the continuity equation and motion equation, combined with the grid digital elevation model （DEM）, FLO-2d, a two-dimensional rheological model, was used to calculate the simulation results. The Qingshui Gully, Zuizi Gully and Duanheba Gully in Wudu were used as the study areas. The DEM was converted to ASCⅡ in ArcGIS, then it was input to the FLO-2DPRO software to establish a river basin model in order to analyze the possible movement velocity and deposition depth in each grid. The simulation results were integrated and input into the ArcGIS to analyze the possible deposition range. Compared with the Longnan＂8.12＂torrential rain triggered landslides and debris flow disasters in 2010, the correctness of the FLO-2D model was verified insimulating the threat range of a debris flow. The results showed that the disaster threat simulation is broadly in line with the actual range.