4.7 Article

A simplified semi-quantitative procedure based on the SLIP model for landslide risk assessment: the case study of Gioiosa Marea (Sicily, Italy)

Journal

LANDSLIDES
Volume 20, Issue 7, Pages 1381-1403

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s10346-023-02040-8

Keywords

Shallow landslides; SLIP model; Risk assessment; Regional landslide susceptibility assessment

Ask authors/readers for more resources

This study proposes a simplified methodology for rainfall-induced shallow landslides risk assessment, combining susceptibility assessment from a physically-based model with distance indices representing interference probability with elements at risk. The methodology is applied to Gioiosa Marea municipality in Italy, showing that all detected areas are affected by SLIP safety factor between 0 and 2. However, the validation of results is limited due to the lack of details in regional hydrogeological plans.
Landslide risk assessment is fundamental in identifying risk areas, where mitigation measures must be introduced. Most of the existing methods are based on susceptibility assessment strongly site-specific and require information often unavailable for damage quantification. This study proposes a simplified methodology, specific for rainfall-induced shallow landslides, that tries to overcome both these limitations. Susceptibility assessed from a physically-based model SLIP (shallow landslides instability prediction) is combined with distance derived indices representing the interference probability with elements at risk in the anthropized environment. The methodology is applied to Gioiosa Marea municipality (Sicily, south Italy), where shallow landslides are often triggered by rainfall causing relevant social and economic damage because of their interference with roads. SLIP parameters are first calibrated to predict the spatial and temporal occurrence of past surveyed phenomena. Susceptibility is then assessed in the whole municipality and validated by comparison with areas affected by slide movements according to the regional databases of historical landslides. It is shown that all the detected areas are covered by points where the SLIP safety factor ranges between 0 and 2. Risk is finally assessed after computation of distances from elements at risk, selected from the land use map. In this case, results are not well validated because of lack of details in the available regional hydrogeological plan, both in terms of extension and information. Further validation of the proposed interference indices is required, e.g., with studies of landslide propagation, which can also allow considerations on the provoked damage.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available