A Performance-Based Approach to Landslide Risk Analysis and Management

A performance-based approach for the assessment of landslide risk and management is shown and discussed. The implemented method is based on a probabilistic model which takes into account all the uncertainties of the involved variables and allows following a performance approach based on given loss or damage thresholds. Given the landslide area-extent and type as the only deterministic input, all other properties to derive landslide severity and frequency are statistically inferred from actual landslides and probabilistically managed to derive probability density functions of the demand of resistance. In turn, the capacity of resistance (i.e., fragility functions) is derived via damage surveys and cards compilation for each investigated asset group (structures, roads and lifelines) and for each limit state (aesthetic, functional and structural). Finally, convolution of landslide hazard, asset fragility and exposure (as the amount of potentially damaged goods) allows the computation of the risk for each limit state condition.