Abstract

MARIN, Roberto J.  and  OSORIO, Juan Pablo. MODELING TREE CONTRIBUTION IN SUSCEPTIBILITY ANALYSIS OF SHALLOW LANDSLIDES. Rev.EIA.Esc.Ing.Antioq [online]. 2017, vol.14, n.28, pp.13-28. ISSN 1794-1237.  https://doi.org/10.24050/reia.v14i28.975.

In this paper an assessment of shallow landslides susceptibility in a tropical and mountainous terrain is made. A method that allows to model slope stability over large areas is used. Tree contribution is quantified by means of three parameters: rainfall interception, root reinforcement and tree surcharge. A rainfall interception model is used to determine the rain available for infiltration and its temporal distribution during the simulation. The hydrological models included in TRIGRS are described, which allows to determine the pore water pressure depending on the initial conditions. This pore water pressure is used in the revised infinite slope stability model, along with root reinforcement and tree surcharge, in order to determine the slope stability in terms of a factor of safety (FS) for an entire basin. Different scenarios of tree density are modeled in a basin of the Valle de Aburra and the results are compared with a model performed without considering the effects of trees on the stability.

The results obtained showed values of FS < 1 (predicting failure with the occurrence of the simulated rainfall event) in the delimited area due to the null presence of trees. On the 26th October 2016, months after the investigation was concluded and the paper submitted to Revista EIA, a shallow landslide occurred in the studied area (municipality of Copacabana, landslide on the Medellín-Bogotá Highway K12+200, in the El Cabuyal zone), indicating that the proposed methodology can be a useful tool for the prediction of shallow landslides.

Keywords : Slope stability; Shallow landslides; TRIGRS; Rainfall interception; Root reinforcement; Tree surcharge.

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