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Análise de processos de erosão celerada, com base em fotografias aéreas e geoprocessamento: Bacia do Rio Bonito (Descalvado, SP)
(Universidade Federal de São Carlos, 2002-04-08) Feres, Roberto; Lorandi, Reinaldo; https://lattes.cnpq.br/7794241793056671
This study relates the methodology adopted to organize the information on the abiotic environment related to the characterization of erosive processes visible in aerial photographs in order to contribute towards actions of planning of the drainage basin of the Bonito river, a sub-basin of the Mogi-Guaçu river, in the municipality of Descalvado-SP, Brazil. The area of study is part of a region highly susceptible to erosive phenomena as a result of favorable conditions provided by the unconsolidated cover material, easily erodible. The environmental fragility of the terrains, however, contrasts with the great fragmentation of the landscape. Under a GIS single georeferenced database at a 1:50,000-compatible scale, all available cartographic and sampling information was organized and compared with a photo mosaic adjusted to a cartographic base of the same area at a 1:10,000 scale, and a visual analysis of the features was performed by photo interpreting. A preliminary map of the unconsolidated material was developed from the information regarding the geological surface formations correlated with the field slope patterns, allowing the automation of the mapping in GIS. The field inspection, aided by real time navigation system on the cartographic information, made possible to diagnose the events found there. The organization applied to the collected information allows the planner to understand each individual developed feature, their causes and the reasons that contribute to it s persistence, correlating them with the local patterns of the environment fragility and compounding an overview of the events that occur in hydrographic basin as a whole.
Utilização de um sistema de informações geográficas associado à equação universal de perda de solo no planejamento do ecoturismo no Município de Santo Antônio do Pinhal - SP
(Universidade Federal de São Carlos, 2002-04-08) Rosalen, David Luciano; Lorandi, Reinaldo; https://lattes.cnpq.br/7794241793056671
Ecoturism hás been blunting inside the industry of the tourism as a promissing revenue source for the local population. However, to make one of its main objectives be accomplished, wich is to help keeping the natural resources, that activity should be planned inside a keeping context. Inside this context, the soil conservation is one of the main features because the soil is the physical, chemical and biological support of the vegetation, either natural or exotic. To conservation it, it s necessary to indentify the erosinal areas, wich can be accomplished by the use of empirical models. Among the different existent models, the Universal Soil Loss Equation (USLE) is one of the most remarkable and used in the use of Geografic Information System (GIS), the applying of this model, by the use of this computacionsl tool, has almost been turned to be necessary due to the speed and to the easiness of simulating different sceneries. Therefore, the present work, through the development of a simple methodology, applied the model EUPS through GIS in the area of Santo Antônio do Pinhal-SP, wich has developed ecoturism activities through the use of trails. Information of the physical site (geology, geomorphology, pedology and topography), area of acceptable and non-acceptable soil losses, areas of everlasting keeping and roads, and the topographical profiles of ecoturism trails of the area, were mixed. The results showed the great weakness of the area when it comes to erosive processes, the unfitness of roads and profiles of the trails concerning the control of erosive processes and the importance of the ecoturism as a revenue alternative for the local population, due the restrict agronomy aptitude of the area.