关键词: 暴雨, 重现期, 地质灾害, 湖北省五峰县

Abstract: By comparing the rainstorm and flood disasters in Wufeng county of Hubei province in 2016 and 2017, combined with the field investigation, the characteristics of rainfall during the two rainstorms were analyzed. The results showed that, the rainstorm event in July 15, 2017, rainstorm process was relatively concentrated, and the rainstorm intensity was large, the rainfall in the Wufeng National Weather Station was 126.6 mm. The rainstorm event in July 19, 2016, was mainly distributed and the intensity was large, the rainfall in the Wufeng National Weather Station was 189.3 mm. From the analysis of daily precipitation, the precipitation ranked the fifth in history on July 19, 2016, and the precipitation of Wufeng on July 15, 2017 was only ranked the 19th in history, but on July 15, 2017, the recurrence period of the maximum 2 consecutive hours of precipitation reached 130 years and ranked the first in the historical ranking. That is, Wufeng's rainstorm event in July 15, 2017, belongs to the "Tuzi rain", which was extremely uneven in distribution, and the short-term rainfall intensity was large. According to investigate the precipitation of 10 days before of the two disasters, the results indicated that there was continuous effective rainfall, and the accumulated rainfall in 2016 and 2017 reached 97.4 mm and 116.4 mm, respectively. The continuous rain caused the soil water to reach saturation or near saturation, and further led to debris flow, landslide, collapse under the effect of heavy precipitation in the later period.

Key words: rainstorm, reprint period, geological hazards, Wufeng county of Hubei province