Determination of Location of the Concentration Initial Field of a Possible Contamination Source in the Black Sea Water Area near the Gerakleisky Peninsula Based on the Adjoint Equations Method

S. G. Demyshev, O. A. Dymova, V. S. Kochergin, S. V. Kochergin✉

Marine Hydrophysical Institute, Russian Academy of Sciences, Sevastopol, Russian Federation

✉ e-mail: vskocher@gmail.com

Abstract

Purpose. The aim of the present article is to study propagation of contamination in the Sevastopol coastal zone using the dynamic model of high spatial discretization and which takes into account actual atmospheric forcing. Location of possible contamination sources is to be calculated and, hence, determined by applying the adjoint equations method using the measurement data assimilation.

Methods and Results. The currents’ field was calculated using the three-dimensional baroclinic model of the Black Sea water circulation developed in the Marine Hydrophysical Institute, RAS. The model is characterized by high degree of spatial discretization. The simulation included application of the SCIRON data on actual atmospheric forcing. The adjoint equations method was used for defying location of possible contamination sources. The model currents in the coastal zone were analyzed for the chosen time period. The admixture distribution from the initial contamination location in the Black Sea water area nearby the Gerakleisky Peninsula was calculated. Having been integrated, a series of the adjoint problems permitted to determine location of the contamination source.

Conclusions. Based on the results of the numerical experiments on integrating a series of the adjoint problems, defined is the area where a possible contamination source can be located. The location of this area agrees well with the initial distribution of concentration that, in case the information on the admixture character is available, permits to define the place where it enters the marine environment. The proposed approaches can be used for solving various ecological problems as well as for interpreting and planning the field experiments on studying sewage propagation in the coastal zone.

Keywords

simulation, identification of contamination source, adjoint problem, admixture transport

Acknowledgements

The study was carried out within the framework of the state task on theme No. 0827-2018-0004 “Complex interdisciplinary investigations of the oceanologic processes conditioning functioning and evolution of the Black and Azov seas’ coastal zones”.

Original russian text

Original Russian Text © S. G. Demyshev, O. A. Dymova, V. S. Kochergin, S. V. Kochergin, 2020, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 36, Iss. 2, pp. 226–237 (2020)

For citation

Demyshev, G.S., Dymova, O.A., Kochergin, V.S. and Kochergin, S.V., 2020. Determination of Location of the Concentration Initial Field of a Possible Contamination Source in the Black Sea Water Area near the Gerakleisky Peninsula Based on the Adjoint Equations Method. Physical Oceanography, [e-journal] 27(2), pp. 210-221. doi:10.22449/1573-160X-2020-2-210-221

DOI

10.22449/1573-160X-2020-2-210-221

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