Abstract
The objective of this study is to assess the influence of the Amazon River seasonal dynamic on floodplain lake morphology. The study area includes the Amazon River floodplain reach encompassed by the Madeira and Tapajós River confluences. Products from the Global Rain Forest Mapping (GRFM) and Moderate Resolution Imaging Spectroradiometer (MODIS) were used to derive variables such as lake size, shape and number. The main steps in the research were: data base implementation, legend definition, image processing (merge, segmentation, classification and edition), morphological mapping and quantitative assessment. Four classes of lacustrine morphology were defined in this study: circular/elliptical, elongated, composite, and dendritic. The result showed that 1) the lake class increased 18.38% from the low- to high-water period; 2) there was a reduction in the total number of lakes from low to high water; 3) the most common lake type was the circular/elliptical; and 4) better results were obtained integrating SAR and optical sensors.
Highlights
The geomorphology of floodplains is characterized by a variety of terrain shapes, such as scroll bars, overbankHow to cite this paper: França, A.M.S., Florenzano, T.G. and Novo, E.M.L.M. (2014) Satellite Images Applied to Assess the Influence of Amazon River Seasonal Dynamic on the Floodplain Lake Morphology
Despite the controversies that surround the Amazon Basin’s geologic history [2], there is a certain degree of consensus that the floodplain geomorphology of the Amazon River, and its main tributaries, respond to tectonic and climatic forcing [3] [4] that have been in place since the late Pleistocene and Holocene periods
We investigate the synergy between optical and Synthetic Aperture Radar (SAR) data in order to evaluate the influence of the Amazon River seasonal dynamic on the lake morphology
Summary
The geomorphology of floodplains is characterized by a variety of terrain shapes, such as scroll bars, overbankHow to cite this paper: França, A.M.S., Florenzano, T.G. and Novo, E.M.L.M. (2014) Satellite Images Applied to Assess the Influence of Amazon River Seasonal Dynamic on the Floodplain Lake Morphology. The tectonic control is linked to trends in the drainage pattern formed by some Amazon tributaries, the NESW and NW-SE trends This pattern was observed in the entire Amazon/Solimões floodplain [5]-[8]. [9] reported that the analysis of the digital elevation model derived from Shuttle Radar Topographic Mission (SRTM) data revealed a large paleo drainage system. This paleo system supports the idea that the Rio Negro’s present lower course is the result of what the authors call a mega-fluvial capture driven by the prevalent active tectonic regime in the Amazon Basin. Other important structural components with E-W and nearly N-S directions were reported [10], indicating intense neo-tectonic activity in the basin
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