Geohazard assessment of landslides in south Brazil: Case study

Journal article


Hamza, Omar, De Vargas, Tiago, Boff, Fernando Eduardo, Hussain, Yawar and Davies-Vollum, S. 2019. Geohazard assessment of landslides in south Brazil: Case study. Geotechnical and Geological Engineering. https://doi.org/10.1007/s10706-019-01054-1
AuthorsHamza, Omar, De Vargas, Tiago, Boff, Fernando Eduardo, Hussain, Yawar and Davies-Vollum, S.
Abstract

Slope instability phenomena such as mudslides represent a major geohazard in Brazil, which has caused devastation in many states and affected the lives of people, particularly in self-built settlements on steep slopes. This paper presents and discusses slope stability issues encountered in Caxias do Sul in the State of Rio Grande do Sul, which exemplifies the existing situation of landslide risk assessment in southern Brazil. Local geology and ground conditions of the area in relation to slope instability were reviewed and gaps in information required for mitigating risk were identified, such as inadequate geotechnical information and lack of full inspection and continuous monitoring of active landslides. Although risk assessment has been developed for the city and regarded as a fundamental management tool in the mitigation of landslide hazards, the study showed that the risk assessment works are outdated and not effectively considered for the development of the city. With significant unplanned urban expansion (where houses have been self-built on very steep terrains without geotechnical assessment of the ground and slope conditions), new geohazard mapping is essentially required. Several key recommendations were provided for mitigating the destructive effect of landslides and improving their management in mountainous urban settings.

KeywordsLandslide; Geohazard assessment; Slope stability
Year2019
JournalGeotechnical and Geological Engineering
PublisherSpringer Science and Business Media LLC
ISSN09603182
15731529
Digital Object Identifier (DOI)https://doi.org/10.1007/s10706-019-01054-1
Web address (URL)http://hdl.handle.net/10545/624179
hdl:10545/624179
Publication dates10 Sep 2019
Publication process dates
Deposited04 Oct 2019, 14:13
Accepted05 Sep 2019
ContributorsUniversity of Derby, Centro Universitário da Serra Gaúcha (FSG) and University of Brasilia
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