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@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 = "01 dez. 2020"
}


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