CONICET | Buscador de Institutos y Recursos Humanos

This work assesses the performance of a 2000-2014 NDVI-MODIS time-series to identify areas of the Paraná River floodplainassociated with different morphodynamic areas and hence ecological behavior.From classification procedures we obtained six NDVI patterns (P1 to P6) differing in their mean values, standard deviation, and seasonality. The NDVIpatterns are evidence of different situations in terms of elevation, flooddynamics, and vegetation physiognomies: P1 represents water bodies, P2 to P4 cover frequently flooded lowlands colonized by marshy vegetation, and P5 and P6are placed on middle and high elevations that are less flooded and also arecovered by tall vegetation (grassland and forest). Instead of differences amongthe six NDVI patterns, they showed a spatial arrangement that allowed theidentification of two parallel belts; belt I, formed by P2 to P4, is placedclose to the Paraná River and its connected branches; while belt II, formed by P5 and mainly P6, appears on the marginal floodplain far away from the mainchannels. The spatial arrangement of the two belts is similar to limitsfollowed by the morphodynamic areas of the Paraná fluvial system. More than 60% of the surface covered by P2 and P5 corresponds to low morphodynamic areaswhile nearly 70% of P6 matches with high morphodynamic areas. Through theirannual and interannual behavior, spatial arrangement, and relationship withmorphodynamic areas, the NDVI patterns allow the interpretation of lateralorganization of the Paraná River floodplain. This paper exploits the potentialof time-series of NDVI to understand, from a synoptic point of view, thefloodplain dynamics by capturing the seasonal and interannual variability ofvegetation physiognomies and hydrosedimentological regime along and across thefloodplain.

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