“5.12”汶川大地震诱发了大量山体滑坡、崩塌、泥石流等次生地质灾害,给当地造成了较严重的人员伤亡和巨大财产损失。青杠沟原为低频泥石流沟,震后泥石流发生频率和危险性大大增加,一旦遇暴雨极易发生泥石流灾害,对灾后居民安置点、旅游度假村及银白公路构成严重威胁。在实际调查基础上,系统分析了青杠沟泥石流形成条件、类型、发展趋势及动力学特征。根据泥石流物源以主沟内不稳定堆积物二次启动所占比例较大等特点,提出了以上游多极低坝拦挡、下游护岸排导和沟道整理相结合的防治对策。 “5.12 ” Wenchuan earthquake induced a large number of secondary landslides, landslides, landslides and other geological disasters, causing serious casualties and huge property losses to the local. Qingbagou was originally a low-frequency debris flow ditch. The frequency and danger of debris flow greatly increased after the earthquake. In the event of heavy rains, landslide hazards easily occurred, posing a serious threat to the resettlement sites, tourist resorts and the Baiyin Highway. Based on the actual investigation, the formation conditions, types, development trends and kinetic characteristics of the Qingli Gully debris flow were systematically analyzed. According to the characteristics of debris source such as large proportion of unstable secondary sediment in main channel, the countermeasures of prevention and control of the combination of drainage guide and trenching of downstream multi-polar low dam were put forward.