8 October 2007 Optical model for the water characterization of the highly turbid water of the Winam Gulf (Victoria Lake)
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Abstract
The study, proposed within the framework of the cooperation with Kenyan Authorities, has been carried out on the Kenyan part of the Lake Victoria. This lake is one of the largest freshwater bodies of the world where, over the last few years, environmental challenges and human impact have perturbed the ecological balance. Pollution and sediments loads from the tributaries rivers and antrophic sources caused a worrying increase of the turbidity level of the lake water. Secchi transparency index has declined from 5 meters in the 1930s to less than one meter in the 1990s. With the aim of providing an inexpensive way to gather information linked to the water clarity and quality, a method for remotely sensed data interpretation, devoted to produce chl (chlorophyll), CDOM (coloured dissolved organic matter) and TSS (total suspended solids) maps, has been assessed. At this purpose a bio-optical model, based on radiative transfer theory in water bodies, has been refined. The method has been applied on an image acquired on January 2004 by ENVISAT/MERIS sensor just a week after an in situ campaign took place. During the in situ campaign a data set for model refinement and products validation has been collected. This data comprise surface radiometric quantity and samples for laboratory analyses. The comparison between the obtained maps and the data provided by the laboratory analysis showed a good correspondence, demonstrating the potentiality of remote observation in supporting the management of the water resources.
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F. Santini, R. M. Cavalli, A. Palombo, S. Pignatti, "Optical model for the water characterization of the highly turbid water of the Winam Gulf (Victoria Lake)", Proc. SPIE 6743, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2007, 67430I (8 October 2007); doi: 10.1117/12.739061; http://dx.doi.org/10.1117/12.739061
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KEYWORDS
Data modeling

Water

Coastal modeling

Optical properties

Radiative transfer

Sensors

Atmospheric modeling

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