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E. G. Lunev V. A. Ivanov A. G. Kirichenko E. M. Lemeshko S. V. Motyzhev 《Physical Oceanography》2011,20(5):366-378
The autonomous drifting buoys equipped with satellite link turn into one of the most important components of the global system
of operative observations of the ocean and the surface layer of the atmosphere. However, on the regional level, the problem
of analysis of the surface circulation of waters in the coastal zone and sea straits remains quite urgent because the available
drifters cannot be used in this case due to their sizes and long intervals between measurements. We present the results of
development and testing of a new drifter system aimed at measuring currents. The system is based on the use of buoys operating
at depths less than 1 m. To improve the space-and-time resolution of measurements, the buoys are equipped with receivers of
the global positioning system (GPS) and GSM modems for the data transfer via cellular communication networks. The drifter system guarantees the possibility of determination
of the coordinates of buoys with a resolution of 3 min in time and 14 m in space. We describe the specific features of the
design of the proposed information-and-measuring drifter system and present the first results of application of new buoys
called “minidrifters” for the pilot monitoring of currents in the Kerch Strait. 相似文献
2.
E. M. Lemeshko A. N. Morozov S. V. Stanichnyi L. D. Mee G. I. Shapiro 《Physical Oceanography》2008,18(6):319-331
The profiles of absolute current velocity obtained by using a lowered acoustic doppler current profiler (LADCP) are presented. In the course of the BSERP-3 expedition, the measurements were carried out in the regions of the Rim Current, anticyclonic eddy, and northwest shelf.
In the core of the Rim Current, a unidirectional motion of waters is traced in layers below the main pycnocline down to depths
greater than 500 m. Its characteristic velocity can be as high as 0.08 m/sec. It is shown that the direct action of the eddy
is detected in the shelf region at distances larger than 20 km from the outer edge of the shelf in the zone bounded by an
isobath of 100 m. The formation of multilayer vertical structures in the field of current velocities is revealed in the region
of interaction of the anticyclonic eddy with irregularities of the bottom on the side of the shelf. A two-layer structure
of currents with specific features in the layer of formed seasonal pycnocline is observed in the region of the shelf down
to an isobath of 100 m. The profiles of the moduli of vertical shears of currents averaged over the casts ensemble are presented
for the abyssal and shelf parts of the sea. It is shown that the shears induced by the geostrophic currents and wave processes
in the region of the main pycnocline are comparable. Below the pycnocline, the shears are mainly determined by the wave processes.
Translated from Morskoi Gidrofizicheskii Zhurnal, No. 6, pp. 25–37, November–December, 2008. 相似文献
3.
The results obtained with the use of a lowered acoustic Doppler current profiler (LADCP) are presented. The use of the LADCP from a vessel was the first in the history of the study of the Black Sea. The measurements were carried out in the northeastern Black Sea under the auspices of the Black Sea Ecosystem Recovery Program (BSERP) in May 2004. The effect of the computation parameters on the quality and accuracy of the calculations of velocity profiles was studied. It was shown that the use of optimal parameters and reliable navigation data and setting the instrument as close to the bottom as possible could essentially enhance the accuracy of the measurements. The current velocity calculations from the LADCP data were compared with the data on the vessel drift under calm weather. The accuracy of the calculations reached 6–8 cm/s. Recommendations on the choice of the optimal parameters for processing the data on the current velocity are presented. 相似文献
4.
For the first time, an acoustic Doppler current profiler (ADCP) produced by the RDI is used in the water area of the Black
Sea in the lowered mode. This direction in the application of acoustic Doppler current profilers is now in the stage of development
and verification of various procedures of measurements with subsequent data processing and enables one to get the distributions
of current velocities down to depths of 1000–6000 m depending on the modification of the instrument. We describe the procedures
of measurements performed with the help of the ADCP in the lowered mode in the course of an expedition and the stages of processing
of the primary data based on the experience of application of similar acoustic current profilers at the Marine Hydrophysical
Institute of the Ukrainian National Academy of Sciences accumulated in the 1980s. We generalize the experience of application
of ADCP under the hydrological conditions of the Black Sea, propose the algorithms of data processing, present the profiles
of absolute current velocity at several stations, compare these profiles with the geostrophic velocities, and determine the
deep-water structure of the field of currents in a shelf-open-sea section made along 31.17°E.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 4, pp. 31–48, July–August, 2006. 相似文献
5.
V. V. Fomin D. V. Alekseev E. M. Lemeshko D. I. Lazorenko 《Russian Meteorology and Hydrology》2018,43(2):95-102
Storm surges and wind waves in the Taganrog Bay (the Sea of Azov) are simulated with the ADCIRC+SWAN numerical model, and the mechanisms of the Don River delta flooding are analyzed. It is demonstrated that the most intensive flooding of the Don River delta occurs in case of southwestern wind with the speed of not less than 15 m/s. A storm surge leads to the intensification of wind waves in the whole Taganrog Bay due to the general sea level rise. As a result, the significant wave height near the Don River delta increases by 0.5–0.6 m. 相似文献
6.
Tikhonov A. I. Russkikh A. V. Moralev G. V. Golitsyn M. S. Vasil'ev A. V. Duev D. S. Timonova V. A. Nikolaev A. K. Lemeshko A. P. 《Water Resources》2004,31(6):673-678
Uranium-isotopic and multi-element hydrogeochemical methods are used to assess the natural pollution of fresh groundwater in horizons under development due to a modern intrusion of hypogene water with increased boron and fluorine contents in zones of old tectonic dislocations. The total index of the abovestandard (>MAC) pollution of groundwater in the region of the city of Kirov (the Kirov area) reaches 15. To reduce the effect of natural groundwater pollutants on the health of population, it is recommended that the groundwater intake should be regulated, purifiers should be used, and prospects revealed by the isotopic-and-hydrogeochemical data should be explored. The feasibility of modeling the groundwater formation and tracing the neotectonic dislocations in geological platforms is shown. 相似文献
7.
Goryachkin Yu. N. Ivanov V. A. Lemeshko E. M. Lipchenko M. M. 《Physical Oceanography》2003,13(6):355-360
We compare the estimates of the flow rates for the Upper and Lower Bosporus Currents obtained by using both the altimetry data on the Black-Sea level and the data of the coastal stations. Earlier, in analyzing the water exchange, it was customary to use the mean sea level computed according to the data of coastal stations located along the coast of the former Soviet Union. It is shown that the seasonal and annual variations of the increments of the mean sea level are qualitatively similar for the data of both types. At the same time, the values of the amplitudes of seasonal variations are noticeably different. The use of the increments of the mean sea level computed according to the altimetry data leads to insignificant changes in the annual water exchange through Bosporus as compared with the values obtained by using the coastal data. However, the seasonal variations of these data are somewhat different. We propose an algorithm for the evaluation of increments of the sea level, which, in authors' opinion, decreases the error in the analysis of water balance. 相似文献
8.
V. P. Evstigneev V. A. Naumova M. P. Evstigneev N. A. Lemeshko 《Russian Meteorology and Hydrology》2016,41(1):19-27
The seasonal distribution of linear trends in air temperature on the coast of the Black and Azov seas in 1936-2010 is analyzed using the quantile regression method. Monthly mean and median values of temperature as well as 10% and 90% quantiles of average daily values of temperature are considered to describe changes in extreme positive and negative temperature anomalies. It is demonstrated that besides tendencies that are common for all meteorological stations, local features and physiographic location of the stations are of great importance for the distribution of temperature trends. 相似文献
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