Landslide Susceptibility Analysis by Applying TRIGRS to a Reliable Geotechnical Slope Model

Mariantonietta Ciurleo,Nicola Moraci,Vito Foresta,Settimio Ferlisi,Maria Clorinda Mandaglio

doi:10.3390/geosciences12010018

Mariantonietta Ciurleo, Nicola Moraci + Show 3 more

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https://doi.org/10.3390/geosciences12010018

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Journal: Geosciences	Publication Date: Dec 31, 2021
Citations: 9	License type: CC BY 4.0

Affiliation: University of Reggio Calabria, University of Salerno

Abstract

This paper presents the results of a research aimed at analysing the susceptibility to shallow landslides of a study area in the Calabria region (Southern Italy). These shallow landslides, which in some cases evolve as debris flows, periodically affect the study area, causing damage to structures and infrastructure. The involved soils come from the weathering of gneissic rocks and cover about 60% of the study area. To fulfil the goal of the research, the Transient Rainfall Infiltration and Grid-based Slope-Stability (TRIGRS) model was first used, assuming input data (including physical and mechanical parameters of soils) provided by the scientific literature. Then, the preliminary results obtained were used to properly locate in situ investigations that included sampling. Geotechnical laboratory tests allowed characterising the investigated soils, and related parameters were used as new input data of the TRIGRS model. The generated shallow landslide susceptibility scenario showed a good predictive capability based on the adoption of a cutoff-independent performance technique.

Highlights

Geotechnical Slope Model.Landslide risk management is a complex process that first involves analysing the risk [1]
We focused on shallow landslides involving soils of weathering class VI, because they, as observed in the last decades, propagate as debris flows able to reach the urbanized area and the transportation infrastructure located in the coastal plain
To carry out several parametric analyses with the main aim to identify the combination of geotechnical parameters that allowed the best matching the source areas of the landslides mapped in the inventory of the study area (Figure 1B)

Summary

Introduction

Geotechnical Slope Model.Landslide risk management is a complex process that first involves analysing the risk [1]. This work focuses on the susceptibility analysis at a large scale (1:5000) to (the occurrence of) rainfall-induced first-time shallow landslides that, during the propagation stage, can be rich with high kinetic energy values to cause detrimental effects on the exposed elements located in piedmont areas [7,8,9,10,11,12]. To this aim, we applied the “Transient Rainfall

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Conclusion