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On rainfall-induced landslides : a deterministic approach

In recent years, the assessment of landslide hazards has become a topic of major interest for both geoscientists and engineering professionals as well as for local communities and the administrations in many parts of the world. To satisfy the increasingly urgent demand for protection against landslides, it is necessary to assess landslide hazard. After defining landslide hazard, attention concentrates on rainfall as a trigger of landsliding. The main physical factors bearing on rainfall-induced landslides are outlined. A method is proposed by which landslide hazard can be systematically assessed within a deterministic framework. This involves combining a slope stability model with a hydrological model to define a rainfall-induced landslide initiation threshold for a particular slope as a function of its physical properties. When used in conjunction with the local rainfall intensity distribution, the spatial and temporal components of landslide hazard can be quantitatively assessed. An important result of this study is that landsliding in slopes with relatively shallow bedrock depth typically occur along the soil-bedrock interface as a result of a rising water table whereas landsliding in slopes with great bedrock depths can occur either at relatively shallow depths due to the infiltrating rainwater, or at greater depths along the soil-bedrock interface due to a rise in the water table. Thesis Supervisor: Herbert H. Einstein Title: Professor of Civil and Environmental Engineering