@Article{LondeNovoBarbAraú:2016:StCaIb,
author = "Londe, Luciana R. and Novo, Evlyn M{\'a}rcia Le{\~a}o de Moraes
and Barbosa, Cl{\'a}udio Clemente Faria and Ara{\'u}jo, Carlos
Alberto Sampaio de",
affiliation = "{Centro Nacional de Monitoramento e Alertas de Desastres Naturais
(CEMADEN)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Water residence time affecting phytoplankton blooms: study case in
Ibitinga Reservoir (S{\~a}o Paulo, Brazil) using Landsat/TM
images",
journal = "Brazilian Journal of Biology",
year = "2016",
volume = "76",
number = "3",
pages = "664--672",
month = "July/Sept.",
keywords = "Chlorophyll-a, Hydraulic residence time, Landsat TM4/TM3 band
ratios, Phytoplankton bloom.",
abstract = "Satellite images are an effective tool for the detection of
phytoplankton blooms, since they cause striking changes in water
color. Bloom intensity can be expressed in terms of chlorophyll-a
concentration. Previous studies suggest the use of Landsat TM4/TM3
reflectance ratio to retrieve surface chlorophyll-a concentration
from aquatic systems. In this study we assumed that a remote
sensing trophic state index can be applied to investigate how
changes in HRT along the hydrologic year affect the spatial
distribution of the phytoplankton blooms at Ibitingas reservoir
surface. For that, we formulated two objectives: (1) apply a
semi-empirical model which uses this reflectance ratio to map
chlorophyll-a concentration at Ibitinga reservoir along the 2005
hydrologic year and (2) assess how changes in hydraulic residence
time (HRT) affect the spatial distribution of phytoplankton blooms
at Ibitinga Reservoir. The study site was chosen because previous
studies reported seasonal changes in the reservoir limnology which
might be related to the reservoir seasonality and hydrodynamics.
Six Landsat/TM images were acquired over Ibitinga reservoir during
2005 and water flow measurements provided by the Brazilian
Electric System National Operator - ONS were used to compute the
reservoir´s residence time, which varied from 5.37 to 52.39 days
during 2005. The HRT in the date of image acquisition was then
compared to the distribution of chlorophyll-a in the reservoir.
The results showed that the HRT increasing implies the increasing
of the reservoir surface occupied by phytoplankton blooms. © 2016,
Instituto Internacional de Ecologia.",
doi = "10.1590/1519-6984.23814",
url = "http://dx.doi.org/10.1590/1519-6984.23814",
issn = "1519-6984",
language = "en",
targetfile = "londe_water.pdf",
urlaccessdate = "27 abr. 2024"
}