Utilização de geotecnologia no estudo das “Terras Caídas” na Terra Indígena barreira da Missão, Tefé/Amazonas/Brasil

Use of geotechnology in the study of the “Fallen Lands” in the Indigenous Land of the Mission barrier, Tefé/Amazonas/Brazil

Abstract

The “Fallen Lands” are morphodynamic processes that occur mainly in Amazonian rivers and that cause significant changes in landscapes, including triggering material and human losses. This study aims to characterize and analyze physical-natural events by determining formation/change rates of Fallen Land processes in the Barreira Indigenous Land (Tefé/Amazonas) based on the use of geotechnologies. Methodologically, the tools available in Google Earth Pro were used to collect, process and interpret spatial data (elevation profile, drainage, vegetation and soil coverage) and human activities (economic and housing occupation) along the erosion scars. As an analytical parameter, 20 features were determined (five in each indigenous community) demonstrating the variety of the process in its geometries, dimensions and spatio-temporal behavior, such as Feature 05 located in Barreira de Baixo, with an 80 meter perimeter of the erosion scar. The results identified can be useful for the implementation of social and environmental public policies aimed at improving the quality of life of the populations that inhabit these areas, considering that the process intensifies over the years.