Distinctive features of circulation of waters in the region of the Zmeiny Island under the action of winds of various directions

Mikhailova, E. N.; Иванов, В. А.; Kubryakov, A. I.; Shapiro, N. B.

doi:10.1007/bf02519302

Cited by 2 publications

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“…The analysis of the numerical results carried out in [5,7,9] shows that, in the proposed statement of the problem for the investigated time scales (the wind appears instantaneously and blows for 24 h), the location of the zones of upwelling (downwelling) is closely connected with the character of the coastal line and bottom topography. In the surface layer, upwellings (cold anomalies) are revealed, as a fast response of marine media to the wind action, mainly near the coast.…”

Section: Numerical Experimentsmentioning

confidence: 96%

“…As in [9], the coefficient of vertical momentum exchange A is assumed to be proportional to the sea depth H ( x, y ) and varies from 7 to 100 cm 2 /sec. The coefficient of horizontal viscosity A l = 10 16 cm 4 /sec and the coefficients of vertical and horizontal diffusion μ z = 5 ⋅ 10 -2 cm 2 /sec and μ l = 10 15 cm 4 /sec, respectively.…”

Section: Numerical Experimentsmentioning

confidence: 99%

“…Hence, the problem of investigation of the circulation of water masses in this region under the action of various external factors seems to be of high importance [1][2][3][4][5][6][7][8][9]. The processes running on the shelf strongly differ from the processes observed in the abyssal regions of the sea.…”

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confidence: 99%

“…The present work continues a series of works [5][6][7][8][9] and is devoted to a more detailed analysis of the three-dimensional structure of wind-induced upwellings in the regions located far from the coast near local topographic features.…”

mentioning

confidence: 99%

“…Thus, we consider the northwest part of the Black Sea with open boundary located sufficiently far from the continental slope in order to guarantee that the choice of the boundary conditions does not exert any substantial influence on the dynamics of waters in the region of the northwest shelf and continental slope. We use the numerical multilevel model [7][8][9] based on the complete equations of hydrodynamics of the ocean, i.e., on the nonlinear equations in the Boussinesq and hydrostatic approximations. In this model, it is possible to compute the topography of the sea-level surface without using the "rigid-lid" approximation.…”

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confidence: 99%

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Modeling of wind upwellings on the northwest shelf of the Black Sea near local features of the bottom topography

2008

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551.465We discuss the results of numerical experiments aimed at the investigation of the process of formation of the three-dimensional structure of the zones of upwelling on the northwest shelf of the Black Sea depending on the direction of the wind. We perform the detailed analysis of three zones (I, II, and III) with fairly well pronounced inhomogeneities of the bottom topography. Zone I is located in the north part of the shelf and, in this region, we observe a narrow depression to the southwest of the Tendrovskaya Spit. In zone II located in the near-Danube zone, we observe a height reaching the sea surface (Zmeinyi Island). Zone III is located in the east part of the shelf and corresponds to a sharp drop of depths with specific curvature of the coastal line of the Kalamitskii Bay and Gerakleiskii Peninsula. The performed analysis enables us to conclude that, in the vicinity of the local features of the bottom topography and coastal line (such as underwater heights, depressions, and capes), we observe the appearance of the zones of upwelling of waters, especially pronounced in the deep-water layers of the sea.The northwest shelf of the Black Sea attracts significant attention of researchers in various fields as a promising object of industrial and economic utilization. Hence, the problem of investigation of the circulation of water masses in this region under the action of various external factors seems to be of high importance [1-9]. The processes running on the shelf strongly differ from the processes observed in the abyssal regions of the sea. In the shallow-water coastal zone, the currents are, as a rule, quite strong and the role of bottom friction (insignificant in the open sea) becomes noticeable. The presence of the coastal line imposes restrictions on the motion of waters and leads to the formation of surges. The river discharge promotes the process of freshening of seawater near the coast, i.e., decreases its salinity and, hence, density and, in this way, affects the currents. The influence of external thermal factors on the shelf is also characterized by certain specific features. Thus, for the same heat fluxes through the sea surface, the shallow-water coastal zones suffer greater temperature variations than the abyssal regions. On the boundary of the shelf and the abyssal part of the sea, there is a drop of depths, where the bottom slope sharply increases. Large slopes of the bottom lead to a special character of circulation responsible for the formation of frontal zones and intense jet currents. In turn, the process of meandering of these currents, promotes the formation of eddies and the appearance of upwellings and downwellings.In general, the northwest shelf can be regarded as a striking example of a region (with three-dimensional structure of circulation and thermohaline fields) interacting with the abyssal part of the sea. The phenomenon of upwelling observed both near the coasts and in the open sea is one of the most typical but insufficiently studied phenomena in this region. In this regi...

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Section: Numerical Experimentsmentioning

confidence: 96%

Section: Numerical Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Modeling of wind upwellings on the northwest shelf of the Black Sea near local features of the bottom topography

2008

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Simulation of the Circulation and Space Structure of Thermohaline Fields in the Sevastopol Bay with Regard for the Actual External Data (Winter, 1997)

Mikhailova

Shapiro

2005

Phys Oceanogr

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551.465We discuss the results of the numerical experiment aimed at the simulation of the behavior of currents and transformations of the temperature and salt modes in the Sevastopol Bay in January-February 1997. In the numerical analysis, we use actual data on the velocity and direction of the wind, sea surface temperature, and the discharge of River Chernaya. It is shown that the circulation and structure of hydrological fields are mainly connected with the direction of the wind, its intensity, and variability in the course of time. Since the analyzed water area is shallow, the currents inside the bay undergo rapid transformations (less than for an hour after changes in the wind). At the same time, the transformations of the thermohaline fields are slower. Due to the inflow of fresh waters of River Chernaya and salt waters from the open sea through the strait, the structure of thermohaline fields formed in the bay is nonuniform (both in the vertical and horizontal directions). The distribution of salinity plays the main role in the formation of the vertical stratification, which is natural for the winter season. Due to the process of freshening of water, a quite high vertical salinity gradient is formed in the upper layer of the sea. As a result, the process of cooling does not lead to the appearance of convection and inversions of temperature are formed in the case where warmer waters are located in the bottom layers.In recent years, the results obtained with the help of mathematical models of the ecological state of various coastal water areas are extensively and successfully applied for the efficient solution of the problems of ecological safety in these areas. The Sevastopol Bay is one of important regions of great scientific interest. As the principal factors specifying the natural properties of waters in the Sevastopol Bay, one can mention the interaction with the atmosphere (heat exchange, precipitation, and evaporation), freshening by the waters of River Chernaya flowing into the east part of the bay and waste waters, and the interaction with waters of the open sea through the strait in the west part of the bay including, in particular, the process of salinization with seawater coming into the bay. The interaction of waters coming into the bay and their mixing as a result of advection and turbulent diffusion lead to the formation of transformed waters specific for the bay. The properties of these waters and the level of anthropogenic influence vary depending on the ratios of the volumes of fresh (river and waste waters and precipitation) and salt (sea) waters coming into the bay. The dynamics and transformations of these waters should be studied within the framework of a model of the ecosystem of the bay whose thermohydrodynamic block must describe the circulation and thermohaline structure of waters in the analyzed region. In [1], the circulation of waters is described by using the Fel'zenbaum model [2], i.e., a barotropic linear model of steady wind currents in a homogeneous sea neglecting the horizont...

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Distinctive features of circulation of waters in the region of the Zmeiny Island under the action of winds of various directions

Cited by 2 publications

References 0 publications

Modeling of wind upwellings on the northwest shelf of the Black Sea near local features of the bottom topography

Modeling of wind upwellings on the northwest shelf of the Black Sea near local features of the bottom topography

Simulation of the Circulation and Space Structure of Thermohaline Fields in the Sevastopol Bay with Regard for the Actual External Data (Winter, 1997)

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