Plenary Lecture

Assessment of Risk Factors of Environment Pollution Caused by Accidental Oil Spilling on the Base of Mathematical Modelling

Professor Teimuraz Davitashvili
I. Vekua Institute of Applied Mathematics
Tbilisi State University
Georgian Hydro-Meteorological Institute

Abstract: Pollution of the environment by solid, liquid and gas contaminants of artificial origin have been in the center of heightened attention of scientists for several decades and represents one of the most important problems of the contemporary science. Putting this problem forward is conditioned by the fact that most contaminants have a harmful effect on the health of living organisms, on the hygiene of the biosphere and on the regional and global climate alteration which represents one of the main problems of present days. The oil spillage caused by oil transportation by pipeline and railway results in serious deterioration of environment. Namely in the result of accidental spilling the oil can be spreading over the dry surface, it can cover the holes and depressions, it may be found in river through the peculiarities of relief and afterwards it can be transported into the seawater. As rule, the oil spilling, spreading and flowing over the dry surface is following by the oil penetration in subsoil. If this phenomenon proceeds intensively, then it may be happened to revealed oil in groundwater and it may be transported by groundwater flows. All these processes have very seriously impact on environment, and therefore, on human health. So it is very important to carry out preventive model studies of possible emergency situations.
In this article distribution of petroleum and mineral oil into the soils in case of their emergency spilling on the flat surface containing pits is studied and analyzed. The behaviors of the infiltration process and diffusion parameters are studied. Also spreading of the spilled oil in the Georgian Black Sea coastal zone on the basis of a 2-D numerical model of oil distribution in the seawaters is simulated. Some results of numerical experiments are presented. Numerical experiments were carried out for different hypothetical sources of pollution in case of different sea circulation regimes dominated for the four seasons in the Georgian Black Sea coastal zone. Results of calculations have shown that risk of surface and subsurface waters pollution owing to oil emergency spilling is high.

Brief Biography of the Speaker: Prof.Teimuraz Davitashvili holds a 5-year Diploma in Mathematics (specialization Hydro-air Mechanics) from Tbilisi State University (1972). In 1985 he received the Ph.D and in 1997 the Doctor of Physics and Mathematics upon the doctoral thesis “ Numerical Modelling of Some Problems of Atmosphere Physics for Mountain Regions“. Since 1972- researcher, senior researcher, head of department and currently head of laboratory of Mathematical Modelling and Numerical Analyses at I.Vekua Institute of Applied Mathematics of Tbilisi State University. From 1994 to 1998 an Associate Professor and from 1999 to 2006 a Full Professor of Tbilisi State University. Since 2006- head of department of Weather Forecast and Modelling of Natural and Anthropogenic Catastrophic Events at the Hydrometeorological Institute of Georgia. He published 1 book, about 130 research papers in various scientific journals and international conference proceedings. His general research interests are: applied mathematics, computational simulation of non-ordinary events, numerical modeling of environmental pollution and weather forecast by numerical methods.

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