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“5.12”汶川地震引起崩塌、滑坡、不稳定边坡大量发育,形成的大量固体物质堆积于山坡及沟道中,形成了大量石流物源,震后泥石流暴发的临界降雨量大大降低,其启动和运动方式发生明显改变泥石流活跃期可能持续10～20a,这将是影响灾区恢复重建的最大地质灾害隐患,应高度重视。介绍了地震灾区某泥石流沟发育特征并进行性了危险性评价,计算出不同频率条件下的泥石流流量,为日后该泥石流的治理工程提供依据。
After the Wenchuan earthquake caused a great deal of landslides, landslides and unstable slopes, a large amount of solid material was accumulated on the slopes and channels, forming a large amount of rock source. After the earthquake, the critical rainfall amount greatly reduced, Its start-up and movement patterns have changed significantly. The active period of debris flow may last 10 ~ 20 years, which will be the biggest hazard of geological disasters that will affect the recovery and reconstruction of disaster areas. The development characteristics of a debris flow ditch in the earthquake-stricken area and its risk assessment were introduced. The debris flow rate at different frequencies was calculated, which provided the basis for the future debris flow control project.