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季节性汛期4-9月,特别是主汛期6-8月,是山洪灾害多发期。在同一流域,甚至同一年内有可能发生多次山洪灾害,所以具有季节性强、频率高的特征。突发性山丘区小流域因流域面积和沟道调蓄能力小,沟道坡降大,流程短,洪水持续时间较短,但水位涨幅大、洪峰流量高。降雨产流迅速,一般只有数小时,激发山洪的暴雨具有突发性,导致山洪灾害的突发性,山洪暴发历时很短,成灾非常迅速。
Seasonal flood season from April to September, especially the main flood season from June to August, is a period of multiple flash floods. In the same basin, there may be multiple flash floods in the same year, so it has the characteristics of strong seasonality and high frequency. Due to the small drainage area and channel regulation capacity, the small watershed in the sudden hillside area has a large channel slope, short process and short duration of flood, but the water level increases greatly and the flood peak flow rate is high. Rapid rainfall and runoff, usually only a few hours, triggered a torrent of flash floods, resulting in sudden flash flood disaster, flash floods lasted very short duration, disaster was very rapid.