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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 3, pp. 167-183

Front in the coastal zone of the sea with a narrow shelf: surface manifestations and internal dynamics

А.N. Serebryany 1, 2 , O.E. Popov 3 , G.V. Kenigsberger 4 , V.P. Elistratov 4 , E.E. Khimchenko 1 
1 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
2 N.N. Andreyev Acoustics Institute, Moscow, Russia
3 A.M. Obukhov Institute of Physics of Atmosphere, Moscow, Russia
4 Institute of Ecology of Academy of Sciences of Abkhazia, Sukhum, Abkhazia
Accepted: 21.05.2018
DOI: 10.21046/2070-7401-2018-15-3-167-183
The data of observations of the approach to the coastal zone of the local hydrological front which appears on the sea surface in the form of a foam band rapidly approaching the shore are discussed. The appearance of a foam strip in the coastal zone of Abkhazia on September 18, 2016 was a forerunner of the strengthening of the northwestern coastline current, which in its turn was due to the approach of the Black Sea mainstream to the shoreline. A detailed description of the processes in the depth of the sea accompanying the passage of the sharp boundary of the front is given on the basis of measurements made with a thermistor chain and ADCP Rio Grande 600 kHz fixed on the stationary platform, as well as video and photography. The moving surface intrusion of cold waters generated a train of intense internal waves of the mode 2 with amplitudes up to 7 m on the lower thermocline, which was transformed into the mode 1 and reached the shore. Before approaching the sharp boundary of the front, portions of cold salt water appeared in the surface layers of the coastal zone in the form of cone-shaped inclusions which we interpret as the manifestation of filaments generated by the front. Observations were made in the daytime with quiet weather on the Black Sea shelf off Cape Sukhumsky from the stationary platform of the Hydrophysical Institute of the Academy of Sciences of Abkhazia. The satellite image of the visible range of high spatial resolution MSI Sentinel 2-A of the Abkhazian coast dated September 10, 2017 is analyzed. It clearly shows the plumes of freshened waters emanating from the river Codorus and extending up to Cape Sukhumsky. Frontal zones and packets of internal waves are identified on the boundary of the plume.
Keywords: front, foam band, eddies, internal waves, inertial waves, mode 2 waves, currents, shelf, ADCP, acoustic backscattering, image of visible range, MSI Sentinel 2-A, Black Sea
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