To make an immediate evaluation for the hazard potential of sediment-related slope disaster (or slope-type debris flow) caused by torrential rainfalls, this study aimed to establish a feasible procedure including the currently available numerical tools and analytical techniques using
historical cases. In which, the numerical models included: (1) Rainfall-Seepage-Factor Safety Model or R-S-F Model and (2) Rainfall-Flow-Deposition Model or R-F-D Model. The R-S-F Model is used to calculate the collapse scale of a failure slope characterized by different slope angles, slope lengths,colluvium thicknesses, geological materials, and rainfall intensities. Subsequently, the collapse scale from the R-S-F Model was further converted into the quantity of sediment required for the R-F-D Model to simulate the influence zone of the flowing sediment. Finally, integrating the calculated results of parametric study using the R-S-F Model and R-F-D Model, a series of simplified application
charts could be generated. Accompanying simple field investigations, the application charts can be implemented at the potential area to evaluate the hazard potential of sediment-related slope disaster.hey can be used as a reference for disaster prevention, warning systems, and evacuation aspects during torrential rainfall in typhoon season.
Key Words : Sediment-related disaster of slope, slope-type debris flow, numerical model, R-S-F model, R-F-D model, factor safety of hazard potential.