The algorithm of identification parameters of instant point source of pollution in the Azov Sea on the basis of the method of adjoint equations
UDC
51.37EDN
UVXMAAAbstract
The ecological state of the Azov Sea is required the creation of reliable environmental monitoring systems that allow you effectively to assess the situation in the areas subject to technological impact, especially in the areas of the intensive shipping and the construction of communication systems of a different nature. For such evaluations of the examined object it is effective to use highly productive computer technologies and approaches allowing implementing parallelization of calculations. Solving the problems of the pollution spreading of a different nature in the sea is possible on the basis of the methods of the mathematical modeling and the methods for the solving inverse problems, when according to the measurement data due to their assimilation occurs the identification of the certain parameters of the transport model. Recently, variational methods of assimilation and the method of the adjoint equations have been actively developed and used to solve the oceanographic problems. The algorithms of the measurement data adoption are based generally on the minimization of a quadratic functional prediction quality that characterizes the deviation of the model solutions from the measurement data. The transport model of the passive admixture acts as a limit to the variations of the input parameters. In this work, the method of the adjoint equations is applied that allows searching for the location of the source of pollution. The Identification of the source power was produced by using the variational filtering. The numerical experiments were conducted using a hydrodynamic model of the Azov Sea. The resultant flow fields were used in the modeling the transport of the passive admixture. The numerical experiments have shown that the result of the identification significantly depends on the location of measurement points. The most accurate reproduction of the true value of the power source of pollution is obtained in the case, where measurements are carried out in the region of maximum concentration values of the field, which leads to a better conditionality of the solving problem. In general, the carried out numerical experiments have shown the reliable operation of the power of the algorithm identifying the source of pollution, related to the model of passive admixture transport in the Azov Sea.
Keywords:
method of the adjoint equations, identification of input parameters, passive admixture, transport model, Azov Sea, spreading of pollution, assimilation of the data measurementsFunding information
Работа выполнена в рамках Государственного задания (0827-2014-0010) "Комплексные междисциплинарные исследования океанологических процессов определяющих функционирование и эволюцию экосистем Черного и Азовского морей на основе современных методов контроля состояния морской среды и гидротехнологий".
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