Research of mathematical model of mountainous rainstorm debris flow prediction

Finite volume method was used in this paper to simulate the flow. Model grids were generated automatically. Data was collected from GIS, module terrain was interpolated, and the river channel unit was generalized. The calculation and the treatment of river-type flow, ground type flow, and abrupt slope-type flow were given. Rainfalls in different return periods was calculated, a mountainous rainstorm debris flow prediction model was established. Geology feature, meteorology feature and topography feature of Guilin were analyzed to figure the geological conditions, topography conditions, hydrodynamic conditions and influencing conditions digitally in unit. The possibility standard of formatting debris flow was given. The debris critical zone in Guilin was calculated under the rainstorm in different return periods and contrasting to the debris zone with distribution diagram of plagioclase landslide and debris flow disasters in Guilin, the results matched well.