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      Differences in the occurrence of debris flows in tropical and temperate environments: field observations and geomorphologic characteristics in Serra do Mar (Brazil) and British Columbia (Canada)

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          Abstract

          Abstract Debris flows are among the most destructive types of mass movements throughout the world and are not restricted to certain climate zones or geological environments. In opposite corners of the American continent, Canada and Brazil have experienced several historic debris flows. As part of a one-year international exchange program, the lead author compared morphological evidence related to debris flows and the morphometry of watersheds at sites in Canada and Brazil, with the ultimate goal of improving the understanding of debris flows in Brazil. Field surveys carried out in both areas in 2019 and 2020 permitted observation of the debris-flow signatures, as well as the physical aspects of the surrounding areas and morphometric mapping of watersheds. Both areas exhibit similar typical features of debris flows, and the morphometric results indicate differences that may influence the recurrence of events at the sites in Canada as compared to Brazil due to their higher values for the parameters area > 25° (A25), relief ratio (Rr), and Melton ratio (Mr) at the Canadian sites; however, this dataset is limited. Compared to results in the literature from around the world, values of morphometric parameters at Brazilian sites are within the ranges observed in other tropical climates.

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          The Varnes classification of landslide types, an update

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            DEBRIS-FLOW MOBILIZATION FROM LANDSLIDES

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              The 1987 debris flows in Switzerland: documentation and analysis

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                Author and article information

                Journal
                bjgeo
                Brazilian Journal of Geology
                Braz. J. Geol.
                Sociedade Brasileira de Geologia (São Paulo, SP, Brazil )
                2317-4889
                2317-4692
                2022
                : 52
                : 3
                : e20210064
                Affiliations
                [2] Vancouver British Columbia orgnameUniversity of British Columbia orgdiv1Department of Earth, Ocean, and Atmospheric Sciences Canada amitchell@ 123456bgcengineering.ca
                [1] São Paulo São Paulo orgnameUniversidade de São Paulo orgdiv1Department of Geography Brazil vivian.cristina.dias@ 123456alumni.usp.br
                Article
                S2317-48892022000300304 S2317-4889(22)05200300304
                10.1590/2317-4889202220210064
                af9d073d-4f03-48ed-bc27-72bcba409e18

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 02 September 2021
                : 21 March 2022
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 106, Pages: 0
                Product

                SciELO Brazil

                Categories
                Articles

                morphometry,debris flow,mass movement,field survey,DEM,GIS
                morphometry, debris flow, mass movement, field survey, DEM, GIS

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