@Article{LoboCostNovo:2015:TiAnLa,
author = "Lobo, Felipe L. and Costa, Maycira P. F. and Novo, Evlyn
M{\'a}rcia Le{\~a}o de Moraes",
affiliation = "{University of Victoria} and {University of Victoria} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Time-series analysis of Landsat-MSS/TM/OLI images over Amazonian
waters impacted by gold mining activities",
journal = "Remote Sensing of Environment",
year = "2015",
volume = "157",
pages = "170--184",
keywords = "Landsat time series, deglinting, atmspheric correction, golding
mining.",
abstract = "Water siltation caused by artisanal gold mining has impacted the
Tapaj{\'o}s River Basin in Brazil for the past 40. years, however
spatial-temporal information about changes in water quality and
consequences to the aquatic environment is lacking. To address
this, the Landsat satellite family sensors were used to retrieve
total suspended solids (TSS) of the water of the Tapaj{\'o}s
River from 1973 to 2013. An image processing approach that
includes atmospheric correction, based on the 6S model, and glint
removing, based on shortwave infrared correction, was applied and
validated with in situ radiometric data. An optimization of the
atmospheric correction having dark dense forest spectra as
reference was applied and allowed a robust correction of MSS, TM
and OLI signal to surface reflectance values. Sediment
concentration was estimated based on a non-linear empirical
regression between measured TSS and satellite surface reflectance
at red band. The multi-temporal analysis of TSS showed that the
sediment load in the Tapaj{\'o}s aquatic system is in synchrony
with mining activities, and a constant seasonal variation of water
siltation is observed throughout the time frame of this study. At
the end of the rainy season, mining activities intensify and,
coupled with low water flow, TSS increases. During the high water
level, TSS concentrations were consistently lower because of high
water dilution and low mining activity. In a decadal analysis, a
peak of sediment concentration coincides with a peak of gold
production in all sites analyzed during early 1990s. More
recently, due to the currently gold rush, an increase in suspended
solids has been observed mainly in the Novo and Tocantins rivers
where industrial mining has been installed.",
doi = "10.1016/j.rse.2014.04.030",
url = "http://dx.doi.org/10.1016/j.rse.2014.04.030",
issn = "0034-4257",
label = "lattes: 9857505876280820 3 LoboCostNovo:2014:TiAnLa",
language = "en",
targetfile = "time series analysis.pdf",
urlaccessdate = "23 abr. 2024"
}