Physical Oceanography, Vol.
EXPERIMENTAL AND FIELD RESEARCH
SILICON IN WATERS OF THE SEVASTOPOL BAY IN SPRING 2008
D. S. Khoruzhii
and S. K. Konovalov
On the basis of field studies executed in May 2008, we performed the analysis of the distribution of sili-
con in waters of the Sevastopol Bay under conditions of the formation of a seasonal thermocline. We
discuss differences in the distributions of silicon in the surface and bottom layers, including the zone of
mixing of river and sea waters. We noticed a significant difference in values of the coefficients of corre-
lation between the concentration of silicon and the salinity for the surface and bottom layers. For bottom
layer, we obtain large values of the coefficients of correlation between the concentration of silicon and
other hydrochemical characteristics which are explained by the influence of the processes of transforma-
tion of organic substance.
The Sevastopol Bay is an important object of hydrochemical studies for a number of reasons. One of the
main reasons lies in the fact that the bay is intensively used as a city-forming element and, in this connection,
undergoes high anthropogenic loads. In addition, it is of a certain interest for scientific researches related to
studies of the formation of a hydrochemical structure of marine coastal systems.
In the previous years, the measurements of the concentration of silicon in waters of the Sevastopol Bay
were carried out within the framework of a hydrological and hydrochemical monitoring of the state of the bay
. Moreover, the main attention was given to the estimates of the level of pollution of the bay. Silicon is not a
pollutant. However, the analysis of its distribution allows one to evaluate the influence of natural processes and
anthropogenic factors on the formation of a hydrochemical structure of waters of the Sevastopol Bay.
The collection of factors determining the concentration of silicon in sea water in near-estuary regions can
be divided into two large groups. The first group includes hydrophysical processes and geomorphological spe-
cific features of the estuary region, whereas the second covers biological, physicochemical, and biogeochemical
processes. The Sevastopol Bay is an estuary region whose hydrochemical structure is formed under the action
of a substantial river discharge, exchange of water with the open part of the sea, and interaction of the sea and
river waters inside the bay . The chemicobiological processes of formation are represented, in the first turn,
by processes of formation of organic substance and biogeochemical processes of its transformation. In addition,
we may assume the influence of physicochemical processes in the zone of mixing of river and sea waters (bar-
rier zone). The quality of waters of the bay is also affected by the intense economic activity on the bay coasts
and the disposal of waste waters into the bay.
The concentration of silicon and the salinity in river estuaries are correlated because the fresh waters of riv-
ers are characterized, as a rule, by high contents of silicates. In this connection, the processes running in the bar-
Marine Hydrophysical Institute, Ukrainian National Academy of Sciences, Sevastopol, Ukraine.
Corresponding author; e-mail: firstname.lastname@example.org.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
40–51, May–June, 2010. Original article submitted November 13, 2008;
revision submitted April 3, 2009.
196 0928–5105/10/2010–0196 © 2010 Springer Science+Business Media, Inc.