磨西河流域坡面泥石流形成演化机制及防治

Formation and Evolution Mechanism and Prevention of Slope Debris Flow in Moxihe Basin

针对磨西河流域坡面泥石流的危害,基于现场调查和已有研究成果,研究了坡面泥石流物源及形成机制,发现覆盖层表土流滑、层内滑动、基覆界面滑动形成主要下蚀物源,沟道岸坡滑塌形成主要侧蚀物源,坡面泥石流具有流速大、单次堆积厚度小的运动堆积特征,在此基础上建立了磨西河流域坡面泥石流发育演化的动态过程,即初始期、发展期、衰退期、停止期,近一步明确了其阶段性动态暴发特征,并建立了基于下蚀系数的总储量、动储量的简便计算模型,提出了针对不同泥石流沟发育阶段的防治建议。

Aiming at the damage of slope debris flows in Moxihe basin, the materials and formation mechanism of slope debris flows are researched based on field investigation and existing research results. It finds out that the main ma- terials in process of down-erosion are formed by flow slide of topsoil, inner layer slide and bedrock surface slide; the later- al erosion is bank collapse correspondently~ the slope debris flows in Moxihe basin has the features of large velocity and small thickness in single deposition. And then a dynamic process of slope debris flow in Moxihe basin is establish, which includes four stages of initial, development, recession and rest, and the characteristics of each stage are further studied. Finally, a simple model for calculation of total reserve and dynamic reserve of the slope debris flow in Moxihe basin is es- tablished, and the prevention recommends are proposed.