%0 Conference Proceedings
%4 sid.inpe.br/marte2/2017/10.27.12.37.11
%2 sid.inpe.br/marte2/2017/10.27.12.37.12
%@isbn 978-85-17-00088-1
%F 59886
%T Avaliação de sensibilidade espectral da água do rio Doce a partir de imagem orbital: o desastre ambiental da barragem de rejeito da Samarco Mineração S.A
%D 2017
%A Costa, Silas Alexandria,
%A Silva, Leonardo Almeida da,
%A Prudente, Thiago Awad,
%A Santos, Pablo Santana,
%@electronicmailaddress pablo.srgeo@gmail.com
%E Gherardi, Douglas Francisco Marcolino,
%E Aragão, Luiz Eduardo Oliveira e Cruz de,
%B Simpósio Brasileiro de Sensoriamento Remoto, 18 (SBSR)
%C Santos
%8 28-31 maio 2017
%I Instituto Nacional de Pesquisas Espaciais (INPE)
%J São José dos Campos
%P 2248-2254
%S Anais
%1 Instituto Nacional de Pesquisas Espaciais (INPE)
%X The accident occurred in Mariana-MG causing a total leak of 62,000,000 m³ of sediment, generating an immeasurable socio-environmental impact. The turbidity rate causes the scattering of the incident radiation in the subsurface, allowing to measure a dynamics between the evolution and subsequent involution of the reflectance levels to long time. This paper has the objective to accomplish a temporal evaluation (before the disaster: 10/13/2015, after: 11/30/2015, 01/01/2016 and 05/03/2016) of the spectral response in nearby water targets from the mouth of the river Doce, downstream of the disaster, with orbital images. The surface reflectance images were redesigned for the Southern Hemisphere, and by map of algebra the values for each spectral band of the OLI / LANDSAT-8 (reflective spectrum) were obtained over the 04 periods, in the 09 monitoring points established. The differences in the behavior of the spectral bands in all the analyzed samples show an expressive contrast of the surface reflectance rates before and after the environmental disaster (2 scenarios), that is, after the accident the values found were much higher. The spectral bands B1, B2, B3, B4 and B5 presented statistical significance in the distinction between the two scenarios, while bands B6 and B7 were not sensitive to increase of sediment adsorbed in the water after the environmental disaster. The comparison between the surface reflectance values and the monthly precipitation, allowed to identify the influence of rain (transport of river bank and bottom sediment) on orbital estimates.
%9 Áreas úmidas e águas interiores
%@language pt
%3 59886.pdf