Application of shallow landslide stability model to landslide prediction in the Linxi River basin of southern Zhejiang

Landslides occurred frequently in the Linxi River basin of southern Zhejiang due to typhoon rainstorm. Shallow landslide stability model (SHALSTAB) is used to predict potential landslides according to the landslides characteristics of small scale and large ratio of length to thickness in this area. Log (rainfall q/soil hydraulic conductivity T) is used as the criterion of potential landslide. Quantitative index analysis shows that with the increase of log(q/T) level, the area of landslides predicted by the model expanded gradually, but the model also increased the misjudgment rate. The model has better prediction effect when log(q/T)=-3.1 is applied as criterion to predict landslide. The capture rate of landslides prediction is 62.50%, the misjudgment rate is 17.79%. The simulation results show that bottom of the hillslope, side of the deep valley and the steep hillslope are the landslide-prone regions. Top of the mountain, and the region with shallow soil mass and flat topography have good stability.