Department of Oceanography, Russia
*Corresponding author: Esin NV, Department of Oceanography, Russia
Submission: January 15, 2021;Published: January 28, 2021
ISSN 2578-031X Volume3 Issue5
In recent years, research has begun on the hydrology of very unusual objects - the socalled
Caspian transgressive seas. They are so named because the level of these seas was
significantly higher than the level of the World Ocean. These seas were formed during
the melting of glaciers from fresh water and this water, getting through the straits into
the Mediterranean Sea, caused a significant freshening of Mediterranean waters. Studies
have shown that the formation of transgressive seas is associated with a number of global
hydrological and geological processes: climate change, the formation of continental glaciers
in the form of ice mountains, the formation of the Bosphorus, Dardanelles, Manych straits,
changes in the salinity of water bodies, migration of fish, animals and primitive people, and
the other processes on the globe. Thus, the study of the hydrology of seas, which no exist
for a long time, showed the need to study processes with a completely different mechanism.
For example, it is highly likely that the formation of the deep-sea basin of the Black Sea is
associated with the Messinian salinity crisis in the Mediterranean [1-4].
To solve some of the presented problems, it turned out to be necessary to solve the problem of a two-layer water flow in straits and the problem of water outflow from a transgressive sea based on the Navier-Stokes equations , and to estimate possible fluctuations in the viscosity coefficient of water under various hydrological conditions . We proposed the equation for calculation the sea level change:
where H- is the sea level elevation, t- is the time, W- is the volume of water flowing into the
sea, f - is the evaporation coefficient. Dimension H- m, dimension f- m/year , S = S(H) is the
dependence of the sea area on the sea level elevation. The line S = S (H) was constructed by us
according to the modern relief. The S = S (H) curve can be approximated by two straight lines
in the interval of level marks from -27 m to +60 m and from mark 60 m to above. The article
 presents the course of the Akchagylian Sea level, calculated by the numerical method. This
article shows an analytical solution to equation (1), in which the equation S = a + bH is used to
approximate two straight lines. The solution is presented in a general way since there may be
options in choosing a starting point. Equation (1) and the line S = S (H) allow us to calculate
the volume of water entering the sea, which is necessary for the sea level to rise to a given
stable level H. At this elevation W = f · S (H).
The analytical solution of equation (1) is described by function (2)
The solution shows that as the sea level rises, the volume of evaporating water asymptotically approaches the volume of water flowing into the sea. As a result, a sea with stable shores is formed. An analytical solution to equation (1) shows that H (t) is a transcendental algebraic equation. Its solution is fraught with certain difficulties. But it can be used in a simplified form to analyze the asymptotic approximation H as t →∞.
© 2021 Esin NV. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and build upon your work non-commercially.