A. N. Morozov, V. A. Ivanov, S. A. Shutov, V. V. Zima, D. V. Deriushkin, S. V. Fedorov, A. S. Kuznetsov, L. V. Verzhevskaya, E. V. Mankovskaya
Marine Hydrophysical Institute of RAS, Sevastopol, Russia
Abstract
The results of ADCP measurements of current velocity performed by the special technique in the offshore shelf waters of the Heraklean Peninsula in September 2016 are discussed. The instrument was used as a current profiler and as a high-frequency echo sounder. Methodical aspects of measurements are considered. In the coastal waters in 15 – 25 m layer depths, inhomogeneities in the distribution of the cross section of backscattering of sound with typical horizontal scale of 100 – 200 m are well expressed. The coastline current is relatively increased on horizontal scales of 100 – 200 m nearby 45 m isobath. Normal velocity component has a layered vertical structure. In offshore waters, a sound-dispersing layer of biological origin is well defined on about 40 m level. In the upper 20 m layer, inhomogeneities in the distribution of the cross section of backscatter sound are revealed, which, presumably, have anthropogenic origin.
Keywords
spatial structure of currents, cross-section of backscatter sound, coastal shelf waters, ADCP, Heraklean Peninsula