Observação da pluma estuarina do Douro através de imagens MODIS de alta resolução
2013
The Douro is one of the longest rivers in the Iberian Peninsula and represents the most
important freshwater input into the Atlantic Ocean in the north-western Portuguese
coast. Episodes of strong rainfall intensify the river discharge, and promote the input of
nutrients, and suspended matter in the continental shelf. The main goal of this study is
to analyze the spatial and temporal variability of the Douro river turbidity plume. To
achieve this purpose, daily high-resolution images of Moderate Resolution Imaging
Spectroradiometer (MODIS - Aqua) normalized water-leaving radiance at 555 nm were
processed, from level L1A to L2. The images with more than 70% of contaminated area
due to clouds or other constraints were discarded. A region of interest (ROI) was
defined from the river mouth to the continental slope in order to verify the amount of
turbid pixels (>1.3 mWcm-2μm-1sr-1) in each image and to link it with the river
discharge time series at Crestuma dam. Atmospherically corrected MODIS-Aqua data
revealed strong seasonal variability in the area of the extension of the water plume, as
well as in turbidity levels, which are significantly correlated with river discharge in a
seasonal time scale.
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