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On the possibilities of radar probing of eutrophication zones in water reservoirs |
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| Authors: | S A Ermakov I A Kapustin T N Lazareva I A Sergievskaya N V Andriyanova |
| Institution: | 1. Institute of Applied Physics, Russian Academy of Sciences, Nizhni Novgorod, Russia 2. Nizhni Novgorod State University, Nizhni Novgorod, Russia 3. Russian State Hydrometeorological University, St. Petersburg, Russia 4. Nizhni Novgorod Center for Hydrometeorology and Environmental Monitoring, Nizhni Novgorod, Russia |
| Abstract: | Complex experimental studies of the influence exerted by phytoplankton on microwave backscattering from the water surface are carried out. Quantitative data on the concentration and group composition of the phytoplankton in the Gorky Reservoir during its eutrophication are obtained. It is established that the velocity of damping of gravity-capillary waves increases as the phytoplankton concentration increases, in which case the rise in the coefficient of damping of gravity-capillary waves is caused by an increase in both the effective viscosity of water and the value of elasticity of surface films related to the phytoplankton. It is established that, under the same weather conditions, the intensity of a radar signal decreases in the areas where the phytoplankton concentration is high. The results of model calculations of contrasts in the spectrum of wind gravity-capillary waves and the intensity of a radar signal are presented with respect to the phytoplankton concentration using the reconstructed values of the effective viscosity of water and the elasticity of films in the eutrophication zones, which describe the observational data satisfactorily. |
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