dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorScience and Technology from Pará State
dc.date.accessioned2019-10-06T16:30:00Z
dc.date.accessioned2022-12-19T18:50:54Z
dc.date.available2019-10-06T16:30:00Z
dc.date.available2022-12-19T18:50:54Z
dc.date.created2019-10-06T16:30:00Z
dc.date.issued2019-08-01
dc.identifierAdvances in Space Research, v. 64, n. 3, p. 581-590, 2019.
dc.identifier1879-1948
dc.identifier0273-1177
dc.identifierhttp://hdl.handle.net/11449/189109
dc.identifier10.1016/j.asr.2019.04.035
dc.identifier2-s2.0-85065556785
dc.identifier6691310394410490
dc.identifier0000-0002-8077-2865
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/5370147
dc.description.abstractIn this work, we investigated the trophic gradient in three reservoirs cascading in Tietê River, Southeast Brazil, based on their chlorophyll-a (chl a) concentration. The goal of this study was to identify spatial patterns in the chl a distribution, which are associated with the filtration process caused by reservoir cascade. Hence, maps of chl a content were developed considering a short time series of MSI Sentinel-2A images (2016–2018). A chl a prediction algorithm was applied to images, whose calibration was done from data collected during a severe drought (2014), which led to intense harmful algal blooms (HABs) and after the drought (2016). The outcomes showed that 20 m spatial resolution of MSI Sentinel-2A images are suitable in estimating pigment concentration in small and middle reservoirs. In addition, the Sen2cor atmospheric correction tool exhibited good performance in removing the scattering effects. Its application in retrieving the chl a content also presented good results. Besides reservoir order in the cascade, the storage system showed to be a factor that also affects the trophic state in downstream impoundments.
dc.languageeng
dc.relationAdvances in Space Research
dc.rightsAcesso aberto
dc.sourceScopus
dc.subjectAlgal bloom
dc.subjectBio-optics
dc.subjectInland waters
dc.subjectMultispectral images
dc.titleMapping the chlorophyll-a horizontal gradient in a cascading reservoirs system using MSI Sentinel-2A images
dc.typeArtículos de revistas


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