Sociogeomorphological analysis in a headwater basin in southern brazil with emphasis on land use and land cover change

Effects of natural processes on community building and the modification of nature by man’s hands are an intrinsic part of the co-production of the landscape between man and nature. However, the interactions of this co-production have scarcely been analyzed. Based on data from the MapBiomas project, an analysis of the variation in land use and cover over 35 years in the Quilombola São Roque and Mãe dos Homens communities in southern Brazil was carried out. The sociogeomorphological units in the study area were established, and its geomorphological units and social units were analyzed and described. There is a prevalence of more than 50% of forest formation. Cluster analysis classified the analyzed variables into two groups, with the first corresponding to forest and grassland formations associated with more natural landscape features. The second group is formed by anthropogenic activities. Social units including traditional communities seem to be more related to the stimulation of forest formation. The action of conservation units influences the variation in land use and land cover. There is a Supplementary Material which explains abbreviations concerning the manuscript

Análise geomorfométrica de uma bacia montanhosa com presença de cânion : estudo de caso da bacia do Rio Boi

The river channels and the drainage network play an essential role in landscape evolution. Hydrogeomorphic studies provide valuable information to understand river basins and their processes by identifying relevant morphometric factors within river systems. In this sense, the aim of the present study was to carry out a geomorphometric analysis of the Boi River basin. Inside the basin having the Canyon Itaimbeizinho, there are three remarkable parts, Plateau, Hillslope, and Alluvial Plain. For the three parts, Area (A), Length of the Main River (L), Drainage Density (Dd), River Frequency (Rf), Sinuosity of the Main River (Si), Mean Topographic Index (TIm), and Lineament Density (Lm) were determined. Also, the Box-Counting method was performed to analyze the fractal dimension of the drainage network (DF) and river channels (df). Relations between these variables were verified through Pearson correlation analysis and the adjusted coefficient of determination. Parameters such as A, Si, and TIm are related to drainage network development (DF). While Dd, Dr, and Lm were associated with the development of river channels (df). The study allowed identifying geomorphological characteristics that provide relevant information for analyzing the Boi River basin parts. Geomorphometric studies can complement risk management and prevention studies, applied in the identification of areas with danger potential for the community.Os canais fluviais e a rede de drenagem possuem um importante papel na evolução da paisagem. Estudos hidrogeomorfológicos fornecem informação valiosa para o entendimento das bacias hidrográficas e seus processos, uma vez que identificam fatores morfométricos relevantes dentro dos sistemas fluviais. Portanto, o objetivo deste trabalho foi caracterizar geomorfometricamente a bacia do Rio Boi e as regiões de Planalto, Encosta e Planície (SC/RS). Para as três regiões foram avaliados os fatores: Área (A), Comprimento do Rio Principal (L), Densidade de Drenagem (Dd), Densidade de Rios (Rf), Sinuosidade do Rio Principal (Si), Índice Topográfico médio (TIm) e Densidade de Lineamentos (Lm). Foi aplicada a metodologia de Box-Counting para avaliação da dimensão fractal da rede de drenagem (DF) e dos canais fluviais (df). Verificou-se mediante análises de correlação de Pearson e o coeficiente de determinação ajustado que A, Si e TIm estão relacionados com o desenvolvimento da rede de drenagem (DF), enquanto Dd, Rf e Lm estiveram mais associados ao desenvolvimento dos canais fluviais (df). O estudo permitiu a identificação de características geomorfológicas que fornecem informação relevante para a análise das diferentes regiões da bacia do Rio do Boi. Estudos geomorfometricos tem potencial de complementar estudos de manejo e prevenção de risco, aplicáveis na identificação de áreas com potencial perigoso para a comunidade

Similarities, differences, and improvements for the conceptualization of water-related disasters in South America

La ocurrencia de inundaciones y movimientos de masa húmeda pueden causar serios disturbios en la sociedad, consecuencias que son acentuadas debido a la falta de conocimiento y organización de estas. En países de Sur América se registra una alta tasa de desastres relacionados al agua con efectos intensificados debido a las características de estos. En este sentido, mediante un curso de capacitación online realizado para varios países se identificaron similitudes, diferencias y puntos a mejorar en la conceptualización de los desastres asociados al agua. Las inundaciones y flujos de detritos demostraron ser los eventos con mayor recurrencia en estas sociedades, en donde fenómenos naturales extremos como El Niño y La Niña se mostraron como potencializadores de desastres. Aunque la gestión del riesgo difiere entre países, los organismos de monitoreo se perciben útiles para la toma de decisiones relacionadas a la mitigación y reducción del riesgo. No obstante, Sur América aún presenta grandes debilidades en cuanto a sus sistemas de gestión y conocimiento en la línea aquí evaluada, así el establecimiento de una red Latinoamericana de Desastres Relacionados al Agua (LADERA) y cursos de capacitación podrán ayudar a cerrar la brecha de gestión y reducción del riesgo.The occurrence of floods and humid mass movements can cause several disturbances in communities. Such consequences have been accentuated due to the lack of knowledge and organization of society. In South American countries it is registered a high incidence of extreme events related to water with intensified effects due to the characteristics of these countries. In this way, it was identified similarities, differences, and subjects to improve the conceptualization of disasters associated with water through an online capacitation course realized simultaneously in several countries. Floods and debris flows are the extreme events that most affect society in terms of human and economic losses. El Niño and La Niña were identified as natural phenomena that potentialize such disasters. All countries have well-established administrative bodies to collect and manage data for taking decisions on mitigation and risk reduction, although the management between the considered countries has differences among them. Due to South America's debilities concerning its management systems and knowledge on disaster risk reduction, some actions may help to improve the management and risk reduction in the urban and territorial environment: i) the establishment of a network called Latinoamericana de Desastres Relacionados al Agua (LADERA); and ii) the execution of capacitation courses

Sociogeomorphological Analysis in a Headwater Basin in Southern Brazil with Emphasis on Land Use and Land Cover Change

Effects of natural processes on community building and the modification of nature by man’s hands are an intrinsic part of the co-production of the landscape between man and nature. However, the interactions of this co-production have scarcely been analyzed. Based on data from the MapBiomas project, an analysis of the variation in land use and cover over 35 years in the Quilombola São Roque and Mãe dos Homens communities in southern Brazil was carried out. The sociogeomorphological units in the study area were established, and its geomorphological units and social units were analyzed and described. There is a prevalence of more than 50% of forest formation. Cluster analysis classified the analyzed variables into two groups, with the first corresponding to forest and grassland formations associated with more natural landscape features. The second group is formed by anthropogenic activities. Social units including traditional communities seem to be more related to the stimulation of forest formation. The action of conservation units influences the variation in land use and land cover. There is a Supplementary Material which explains abbreviations concerning the manuscript