Physical Oceanography, Vol.
5, January, 2011 (Ukrainian Original No.
5, September–October, 2010)
NUMERICAL ANALYSIS OF THE PROPAGATION AND AMPLIFICATION OF
TSUNAMI WAVES ON THE NORTHWEST SHELF OF THE BLACK SEA
S. F. Dotsenko
and A. V. Ingerov
We perform the numerical analysis of the process of propagation of long waves in the northwest part of
the Black Sea and consider ten possible zones of the seismic generation of tsunamis. The numerical
analysis is performed on a grid with steps of 500 m. It is shown that the location of the tsunami source
significantly affects the distribution of the heights of waves along the coast. As a rule, the most intense
waves are formed in the closest part of the coast. The earthquakes in the South-Coast seismic zone do
not lead to the formation of tsunamis in the west part of the sea. Only strong earthquakes in the north-
west part of the sea can be responsible for noticeable oscillations of the Black-Sea level. The period of
tsunamis near Odessa is close to 1 h and depends on the magnitude of the earthquake. In the region of
Sevastopol, this period is 2--3 times smaller. In the major part of the coastal points, the extreme eleva-
tions and lowerings of the sea level do not exceed (in modulus) the initial displacements of the sea sur-
face at the source of tsunamis. An intensification of waves emitted from the zones of generation located
in the deeper part of the investigated region was observed for some parts of the Romanian coast and the
west coast of Crimea. As the magnitude of the earthquake increases, the intensification of waves near
the coast becomes more pronounced.
Tsunami is a fairly rare phenomenon for the Black Sea. Thus, for the last 2000 years, we know only about
20 cases of anomalous oscillations of the sea level that can be regarded as tsunamis of seismic nature [1, 2].
These tsunamis were induced both by seaquakes and earthquakes and observed practically along the entire
Black-Sea coast. The instrumental data on the oscillations of sea level are available for four events observed in
the last century, including the tsunamis of 1927 (two events), 1939, and 1966 along the Crimean and Caucasian
coasts of the Black sea. The generalized data on these tsunamis can be found in .
In the northwest part of the Black Sea, tsunamis were practically absent. Even the echoes of instrumentally
studied events were not recorded there. To a significant degree, this is explained by the weak seismic activity in
this part of the Black-Sea basin . Moreover, as shown in , the phenomenon of strong capture of waves by
the shelf areas closest to the tsunami sources significantly weakens the transfer of wave energy from the Cri-
mean (South-Coast) seismically active zone to the west and northwest parts of the sea.
In what follows, we present the results of numerical analysis of the specific features of propagation and in-
tensification of tsunami waves in the northwest part of the sea. The emission of tsunami waves from several hy-
pothetical circular sources of generation in this part of the Black Sea is analyzed for various magnitudes of the
events. Our investigations are based on the use of a nonlinear model of long waves with bottom friction de-
scribed by a quadratic function of the velocity.
Marine Hydrophysical Institute, Ukrainian National Academy of Sciences, Sevastopol, Ukraine.
Corresponding author; e-mail: email@example.com.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
11–20, September–October, 2010. Original article submitted May 25, 2009.
0928–5105/11/2005–0325 © 2011 Springer Science+Business Media, Inc. 325