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Extreme events of rainfall may be responsible for readjustments in the natural elements of river basins due to inward and circulation of matter and excessive energy in short time periods. This work was carried out with the purpose of identifying the extension of changes which occurred in the compartment on the valley floor linked to the riparian vegetation zone of the main channel of the Arroio Michaela river basin (Pelotas/RS), as a result of significant removal, transport and deposition of materials resulting from the extreme rainfall event from January 2009. A classification on the group of difference images, of the scenery before and after the event, the vegetation index, first main component and fraction-images on Alterações no canal principal da bacia hidrográfica do Arroio Michaela, Pelotas-RS, decorrentes de um evento pluviométrico extremo do ano de 2009 Henrique Noguez da Cunha Adalberto Koiti Miura Jose Maria Filippini Alba Mauro Ricardo Roxo Nóbrega Adriano Luís Heck Simon Caminhos de Geografia Uberlândia MG v. 19, n. 68 Dez/2018 p. 143–156 Página 144 Landsat5TM images was elaborated. The results were overestimated when only the difference image of vegetation index was used. The classification of the difference images of the vegetation index with the first main component and the fraction-images presented an elimination of these inconsistencies. The damages were identified by the removals of materials of the steep superior third, removal and deposition in the sinuous medium third and deposition in the flat lower third. This study reveals the assessment of behavior of the drainage system in extreme situations as an important tool of decision-making for use and occupancy.

ALTERAÇÕES NO CANAL PRINCIPAL DA BACIA HIDROGRÁFICA DO ARROIO MICHAELA, PELOTAS-RS, DECORRENTES DE UM EVENTO PLUVIOMÉTRICO EXTREMO DO ANO DE 2009