Rainstorm-induced flash flooding is a serious and recurring natural hazard in the Tibetan Plateau region. Flash flood hazard mapping is an important tool for identifying flood hazard areas. However, results indicated that the selection of indicators representing topography, especially river characteristics may bring the largest uncertainties in Flash flood hazard mapping. In this study, we will evaluate the uncertainties that are caused by indicators of river characteristics by selecting three usually used indicators representing river characteristics for generating three corresponding flash flood hazard maps of the Yarlung Zangbo River basin (YZRB). The three indicators are a) drainage density only; b) distance to a river only; and c) drainage density and distance to a river. Comparing the results with historical flash flood sites and validating them using the single-parameter sensitivity approach, it was found that using both drainage density and distance to the river gives a more accurate flash flood hazard assessment in YZRB. Our findings clarified the uncertainties caused by the selection of river characteristics indicators and filled the gap in the application of flash flood hazard mapping in YZRB. Based on the above findings, we further mapped flash flood hazard regions and the corresponding zoning and it will provide a reference for mitigating potential flash flood events in the YZRB. It is shown that the highest hazard zones were in the YZRB’s middle reaches, particularly in Sangzhuzi district, Qushui county, Gongga county, and their nearby areas.
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Tian et al. (2024) studied this question.
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