Author(s): Jiaming Liu; Chenxi Du; Ziyan Ou; Changwen Li; Junbo Liu; Wenrui Han; Jialong Wu; Guanghui Wu; Qinqin Deng

Linked Author(s):

Keywords: Yunnan plateau mountainous area; Small watershed; Mountain flood; Driving mechanism

Abstract: Flash floods in Yunnan Plateau mountainous areas are highly sudden, destructive, and hard to warn. Taking precipitation as the primary trigger, this study selects Shili River sub-catchment in Yunlong, Dali as the research area. Using multi-source terrain, soil, and meteorological-hydrological data, the MIKE SHE model and controlled variable method are adopted to explore the individual and interactive effects of precipitation, topography, and soil on flash floods. Results show that precipitation dominates flood peak discharge; high soil moisture reduces the disaster-triggering critical rainfall threshold; river length is positively correlated with travel time, while channel slope has a negative exponential relationship with it; sandy loam suppresses runoff, and silty clay amplifies flood intensity. The established “precipitation-topography-soil” multi-factor coupling model provides support for dynamic flash flood warning, risk zoning, and mitigation in the region.

DOI: https://doi.org/10.64697/iahr.proc.hic2026.80

Year: 2026