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Data collection by means of remote sensing products, as aerial photographs and orbital images, have been extensively used for retrieving fluvial systems changes. The aim of this article is to present a methodology for organizing both collection and analysis of this kind of dataset. The methodology is based on the definition of analysis segments, distributed along the alluvial valley. This definition is made by using both the mappings of the floodplain and the central axis of the valley. Posteriorly, must be determined points along that axis, as well as its influence areas. By using the analysis segments and objects to be mapped, such as the fluvial channel and exposed sediments, two types of synthesis were proposed: spatio-temporal and longitudinal. The spatio-temporal synthesis is divided into two kinds, one associated to the channel and another related to the floodplain superficial coverage. As geoprocessing techniques are required to apply the method, the article show options using the free Software QGIS. Lastly, a study case is presented to exemplify the application of the method, whose area is located in the northwest Paraná State.

caminhos de geografia

LEVANTAMENTO DE DADOS E ANÁLISE DE MUDANÇAS EM SISTEMAS FLUVIAIS POR MEIO DE GEOPROCESSAMENTO E SENSORIAMENTO REMOTO: PROPOSTA METODOLÓGICA E ESTUDO DE CASO