ResumoEste trabalho apresenta uma contribuição ao estudo das bacias dos arroios São João e Divisa, município de Alegrete (RS), onde ocorrem processos de erosão acelerada. O mapeamento permitiu separar em cinco unidades geomorfológicas usando atributos como morfometria, geologia, solos, processos erosivos, uso da terra e vegetação. O mapeamento é uma ferramenta indispensável para o planejamento e gerenciamento de áreas com erosão acelerada.
This work uses the methodology proposal by Lollo (1996) to define in the basin of the stream cadena two landforms systems based on the geomorfological process, denominated as dissection and of accumulation areas. These systems were divided in smaller portions of the land, that for its time they are characterized by seven units, described in terms of morphologic features, types of you are worth, characteristic of the relief (altitude, amplitude, declivity), drainage, substratum geologic/pedological, use and occupation of the soil. We has for objective to give a contribution for the scientific knowledge of to how planning the use and occupation of the soil. Lhe analyzing data were integrated with relationship into the natural and anthropic way, identifying the main geomorphological processes.
RESUMOo adensamento da população urbana, com segregação sócio-espacial em suas mais diversas manifestações na ocupação e uso do espaço natural, associado a uma exploração intensiva do meio ambiente e da especulação imobiliária, determina a ocupação por moradias em locais impróprios pelas camadas sociais menos favorecidas. O município de Santa Maria não foge dessa conjuntura, sendo a Vila Bilibiu um local onde se intensificam os conflitos entre o homem e a natureza. Nessa região, ocorrem processos de escorregamento de solo e rolamento de blocos de rocha nas áreas mais íngremes; nas áreas mais próximas ao arroio Vacacaí-Mirim, o evento mais importante é a inundação. Além disso, o acúmulo de lixo em locais impróprios e a falta de esgotamento pluvial e cloacal são fontes de disseminação de animais nocivos e doenças.
The southwestern region of Rio Grande do Sul (RS) is characterized by large portions of sandy soils that have high environmental vulnerability, due to their low fertility and high susceptibility to erosion. Some of these soils have increased clay, suggesting allochtonous pedogenesis. In this case, the aims of this study were to determine evidence of allochtonous pedogenesis on sandstones Botucatu Formation in the southwestern region of the RS. A profile of Argissolo Vermelho and other of Neossolos Quartzarênico were analyzed, both formed on quartz sandstones of the Botucatu formation. Through morphological, physical, chemical and mineralogical analysis was possible to verify the process of allochthonous pedogenesis by higher clay content in the B horizon of the Argissolo profile and confirmed by the absence of clay forming minerals in the rock and in the presence of ilmenite in the pedogenetic horizons and its absence in the rock matrix. The environmental conditions suggest that the ilmenite originates from alteration of the surrounding volcanic rocks.
The stability of two electrical energy transmission towers is discussed in this work. They are located in the south side of "Cerro da Terência" between the towns of Faxinal do Soturno and Dona Francisca.The local geology is represented by a red sedimentary rocks with a texture-range from silt to clay and impermeability. Overloaded it is also observed a coluvionar material with blocs of volcanic rocks together presenting outstanding permeability.The towers casts are settled over coluvionar material, leading to possible instabilities, as a consequence of the high permeability and breakup and further slinding of the colluvio-rocks contact.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.