Physical Oceanography, Vol. 15, No. 4, 2005
MATHEMATICAL MODELING OF MARINE SYSTEMS
NUMERICAL SIMULATION OF WIND CURRENTS AND PROPAGATION
OF IMPURITIES IN THE BALAKLAVA BAY
V. V. Fomin and L. N. Repetin
We present the results of numerical experiments aimed at the simulation of the circulation of wa-
ters and transport of impurities in the Balaklava Bay for typical wind conditions established on
the basis of the analysis of the data of in-situ measurements. The currents are computed by us-
ing the nonlinear
σ-coordinate model. The specific features of the integral circulation and three-
dimensional structure of the current field are investigated. The statistical characteristics of cur-
rents are estimated on the basis of the in-situ data on winds and model calculations. Possible
scenarios of propagation of impurities from the coastal sources are analyzed for various hydrody-
namic conditions. It is shown that the localized eddy structures in the current fields (in combina-
tion with the zones of intense vertical motion) can result in a complex character of the transport
of substances in the bay and lead to the formation of local regions of maximum concentrations of
impurities on the boundary of the north and central parts of the bay.
The Balaklava Bay and the adjacent part of the Black Sea are zones of high economical activity character-
ized by the intense discharge of waste and storm waters. The results of monitoring of waters of the bay reveal
the presence of elevated amounts of biogenic substances and permanent pollution of waters and bottom deposits
with toxic chemical substances [1, 2]. Since the analyzed region is intended for the creation of a recreation tour-
istic center and it is necessary to restore the fish resources of the bay, the requirements to the ecological state of
the bay and the adjacent part of the Black Sea are now made more severe. For this reason, it is important to ana-
lyze the role of currents as one of the main factors specifying the character and intensity of propagation of im-
purities penetrating into the water area of the bay and then into the coastal zone of the sea.
Up to 1991, the Balaklava Bay was unavailable for investigations. Thus, the first episodic measurements of
currents in the south part of the bay and in coastal waters were carried out with the help of autonomous buoy-
based stations and surface buoys only in 1992–1993 . In 1996, the measurements of currents were carried out
by using autonomous buoy-based stations at three depths for 20 days . Since the in-situ data are quite poor
and irregular, the dynamics of currents and propagation of impurities in the Balaklava Bay is studied by using
numerical simulation. Our investigations are carried out in the following directions:
— statistical analysis of the wind conditions in the bay;
— investigation of the specific features of current fields in the bay for the most probable wind conditions;
Marine Department of the Ukrainian Scientific-Research Hydrometeorological Institute, Sevastopol.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
43–58, July–August, 2005. Original article submitted November 20,
2003; revision submitted March 10, 2004.
232 0928-5105/05/1504–0232 © 2005 Springer Science+Business Media, Inc.