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基于对舟曲三眼峪沟流域固体松散物质的调查勘测,阐述该沟“8.8”特大泥石流形成过程中松散物质的补给特征,对沟内固体松散物质的稳定性及可转化数量进行分析评价。分析认为,三眼峪沟泥石流的形成具有以主沟冲蚀再搬运为主的显著特点,以崩塌及沟床松散物质补给为主。沟内极不稳定易转化为泥石流的固体松散物质540×104m3,不稳定的松散物质1 730×104m3,较不稳定的423×104m3,稳定而难以转化的松散物质1 450×104m3。泥石流的主要补给沟段集中于大眼峪沟的竹塔沟—罐子坪沟段、大峪口段,小眼峪沟的滴水崖—峪支沟沟段、小峪口段,控制了上述沟段固体松散物质,将有效控制该沟泥石流的形成。
Based on the survey and survey of the loose solid matter in the Sanyeyugou Catchment in Zhouqu, the characteristics of the supply of loose material during the formation of the “8.8 ” extra-large debris flow are expounded, and the stability and transformable quantity of the solid loose material in the trench are analyzed Evaluation. The analysis shows that the formation of Sanyayukou debris flow is characterized by the main channel erosion and then the transport, which is mainly composed of the collapse and the loose bedding supplies. In the ditch, unstable solid loose material 540 × 104m3, unstable loose material 1 730 × 104m3, unstable 423 × 104m3, stable and hard to change loose material 1 450 × 104m3. The main supply channel of debris flow is concentrated in the Zhutao-Jiuzhaopinggou section of the Great-eye Yugou, the Dayukou section, the dripping cliff of Xiaoyanyukou-the Yizankougou section of Xiaoyukou and the Xiaoyukou section, controlling the above ditches Segment solid loose material, will effectively control the formation of the gully debris flow.