The water represents a complex mixture of a variety of dissolved or particulate materials. This materials have different optical properties, that is, interact with light in different ways in function of their nature and concentration. The presence of these components in the water column is responsible for modifications in the water colour, because they absorbs and scattering selectively the incident light. The signal remotely detected is formed from the following contributions: the scattered light by the atmosphere; the reflected light by the water surface and the upwelling light from the water after been backscattered in the water column. Only the upwelling light from the water have useful information to be used in remote sensing. The quantitatively interpretations of the detected signal by remote sensors in terms of water components require to be identified and isolated the effects caused by variations in the incident light field over the remotely detected signal. Thereupon, the water colour modeling aims to express the remote sensing reflectance in terms of inherent optical properties (IOP), such as total absorption and backscattering coefficients. The objective of this research is to parameterize a bio-optical model to estimate the chlorophyll-a concentration in the water along reservoirs in cascade (Nova Avanhandava and Barra Bonita reservoirs). (AU)
Articles published in Agência FAPESP Newsletter about the research grant:
DA SILVA, EDSON FILISBINO FREIRE;
NOVO, EVLYN MARCIA LEAO DE MORAES;
LOBO, FELIPE DE LUCIA;
BARBOSA, CLAUDIO CLEMENTE FARIA;
NOERNBERG, MAURICIO ALMEIDA;
ROTTA, LUIZ HENRIQUE DA SILVA;
CAIRO, CAROLLINE TRESSMANN;
MACIEL, DANIEL ANDRADE;
FLORES JUNIOR, ROGERIO.
Optical water types found in Brazilian waters.
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