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Séminaire de Prof. Palanisamy Shanmugam

Lundi 15 octobre 2018 à 14 h à Wimereux

par Valérie PLOUVIN - publié le , mis à jour le

Prof. Palanisamy Shanmugam is Head of Ocean Optics and Imaging Laboratory at the Department of Ocean Engineering, Indian Institute of Technology Madras, India

Titre : Optical oceanography and its roles in modern-day applications

Date : Lundi 15 octobre à 14h salle de conférences à Wimereux

Résumé : Abstract : Optical Oceanography – including the sub-disciplines of ocean color remote sensing, radiative transfer theory, underwater visibility, underwater wireless optical and acoustic communication, sensor design and bio-geo-optics, plays a vital role in establishing several modern-day marine applications and ocean environment monitoring. This talk will have a brief discussion on the modern-day applications, research problems and our contribution in the areas such as ocean color remote sensing, underwater wireless optical communication, underwater visibility and bio-geo-optics. We at Ocean Optics and Imaging Laboratory, IIT Madras are involved in developing various optical algorithms to derive various optical properties of particles and dissolved substances, estimate chlorophyll concentration, and classify coral reefs and algal blooms using ocean color imagery. Atmospheric correction algorithm and Rayleigh correction techniques that are integral components of retrieving the geophysical bio-geochemical products using the satellite data with improved accuracy are dealt in our group. We are also involved in assessment and monitoring of coastal and inland waters based on optical methods and their broader applicability to remote sensing data for investigating the water health status/quality conditions over spatio-temporal scales. These results are useful in interpreting the ecological seasonal trends and enhancing our understanding related to deterioration in marine environment which are often led by anthropogenic pressures, nutrient loading, agricultural run-off and land usage, catchment hydrology, land-sea interaction and terrestrially driven sediment discharge. We carry out investigation of underwater light field structure based on the radiative transfer theory and numerical simulation study to gain a keen insight into crucial role of factors such as physical depth, sea-bed bottom reflectance, chlorophyll maximum depth and sediment particulate that tend to alter the optical complexity of the water types under different geometrical illumination conditions. These results find applications in search and rescue, security and channel modelling for UWOC system useful for both environmental and engineering applications.