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    Geohazard assessment of landslides in south Brazil: Case study

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    Authors
    Hamza, Omar
    De Vargas, Tiago
    Boff, Fernando Eduardo
    Hussain, Yawar
    Sian Davies-Vollum, K.
    Affiliation
    University of Derby
    Centro Universitário da Serra Gaúcha (FSG)
    University of Brasilia
    Issue Date
    2019-09-10
    
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    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fundamental management tool in the mitigation of landslide hazards, the study showed that the risk assessment works are outdated and not effectively considered for the development of the city.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.
    Citation
    Hamza, O., De Vargas, T., Boff, F.E., Hussain, Y. and Davies-Vollum, K.S., Geohazard Assessment of Landslides in South Brazil: Case Study. Geotechnical and Geological Engineering, pp.1-14. DOI: 10.1007/s10706-019-01054-1.
    Publisher
    Springer Science and Business Media LLC
    Journal
    Geotechnical and Geological Engineering
    URI
    http://hdl.handle.net/10545/624179
    DOI
    10.1007/s10706-019-01054-1
    Type
    Article
    Language
    en
    ISSN
    09603182
    EISSN
    15731529
    ae974a485f413a2113503eed53cd6c53
    10.1007/s10706-019-01054-1
    Scopus Count
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    Department of Mechanical Engineering & the Built Environment

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