Estudo das variáveis relacionadas às propriedades ópticas da Lagoa Rodrigo de Freitas e aplicação de imagens Landsat-8

• Autor(a) principal: Silva, Amanda Fátima Almeida Paulo da
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13913
• topic: Remote sensing; Landsat-8; Turbidity; Depth of the Secchi disk; Density of the phytoplankton community; Sensoriamento remoto; Landsat-8; Turbidez; Profundidade do disco de Secchi; Densidade da comunidade fitoplanctônica; CNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA FISICA

The present study integrates the parameters responsible for the alteration of the water color of the Rodrigo de Freitas Lagoon with remote sensing measurements. Altogether 15 images were taken from the Landsat-8 satellite, 8 coincident, were selected and correlated with data collected in situ turbidity, Secchi disk depth and density of phytoplankton community. The data point to a significant improvement in water quality from 2014, turbidity and phytoplankton density are best correlated during the wet season. TSS has a relatively good correlation with chlorophyll a, and chlorophyll has a slight tendency to increase and reduce its concentration according to the region of collection in the Rodrigo de Freitas Lagoon. The results showed that the parameters are better evidenced when separating the period in wet and dry. The results showed that the parameters are better evidenced when separating the period in wet and dry. In general, all 3 parameters are best correlated with the remote sensing reflectance during the wet period with the Acolite-SWIR correction by means of ratio between bands, being: Turbidity versus rrs_483div655 = -0.78, depth of the Secchi disk versus rrs_483div655 = 0.82 and density of the phytoplankton community versus rrs_483div561 = -0.87. During the dry period, the correlations were slightly lower, maintaining the predominance of ratio between bands for the SeaDAS-MUMM correction, except for phytoplankton density: Turbidity versus rrs_483div561 = -0.76 and secchi versus rrs_483div561 = 0.61. The phytoplankton density, for the dry period, obtained a correlation of 0.51 for the band rrs561 in the Acolite-SWIR correction, which indicates the lower efficiency of the correction for this period and specific parameter.