Author(s): Changzhi Li; Dongya Sun; Bingshun He

Linked Author(s): Changzhi Li, Dongya Sun

Keywords: Countermeasures; Flash flood; Hazard source

Abstract: For the past few years, much attention has been paid to early warning system to delivery early warnings on flash flood disasters for local people; moreover, raising the awareness of flash flood disasters is also remarkably important. Hence, it is critical to identify how and where flash flood hazards come from in a timely and all-sided way. Based on the recent typical flash flood disaster events in China, which have been categorized as eight modes, this paper performed analysis on the sources of flash flood hazards at catchment scale. Generally, the hazard sources for early warning system and awareness raising include the three categories. The first one is hydrometeorological monitoring networks, which, ideally, should have powerful capacities of catching information on spatial and temporal rainstorm, flood stages at spots of interest, and some hidden dangers that may potentially magnify disasters if they are triggered, typically, debris, bridge and culverts, small reservoirs or pounds, and riverside landslides. The second one is hydrodynamical numeric simulation on rainfall-runoff, flood routing, debris flow, and failure of water-related structures, typically, the mixed scenarios of these situations, from which, the key information can be obtained on inundation area, water/debris depth, flow velocity, and energy. These outputs are highly helpful for local people to raise awareness and to take correct actions in case of flash flood disasters. And the third one is experiences from historic flash flood disaster events, including local or similar areas disaster events. Commonly, retrospective analysis was performed for each flash flood event to find out the reasons, available measures to improve response actions in similar cases in the future.

DOI: https://doi.org/10.3850/iahr-hic2483430201-452

Year: 2024