The development characteristics and formation modes of rainstorm-triggered flash flood disasters in the Hengduan Mountains
The Hengduan Mountains Region is one of the regions with the most densely distributed and severe flash flood disasters in China.It is also the key area for major engineering projects and beautiful countryside construction in southwest China.However,previous studies have not systematically summarized the development characteristics and formation modes of flash flood disasters in this region,which restricts the development and establishment of flood control theory and technical system in the southwestern mountains.This paper focuses on the physical processes of generation,movement and hazard-formation of flash flood disasters in the Hengduan Mountains.It clarifies the dominant disaster-inducing conditions(multiple humid monsoon circulation conditions,high potential energy conditions and high heterogenous underlying surface conditions)and disaster development characteristics(high spatio-temporal heterogeneity,highly concentrated energy,disaster chain and clustered occurrence)of flash floods in the Hengduan Mountains.Based on the entire processes of flash flood disasters,three major formation modes are summarized:the runoff generation of vegetation-hydrology-soil coupling dominated by high hydraulic gradient in mountainous areas,strong runoff-sediment coupled movement,and serious disaster losses due to high exposure of disaster bearing objects.Finally,based on the issues in previous research,four future research challenges for flash flood disasters in the Hengduan Mountains are proposed.Our work contributes to the development of disaster prevention and reduction research,including basic theoretical system,precise risk assessment of regional disasters,and fine early warning and forecasting of flash floods.
Hengduan Mountainsrainstorm-triggered flash flooddisaster-inducing conditiondisaster development characteristicformation mode
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