MODELING OF DYNAMIC PROCESSES IN THE BLACK SEA AND ATMOSPHERE IN PERSPECTIVE OF THEIR COUPLING FOR THE BLACK SEA REGION

2021 ◽  
Author(s):  
Demuri Demetrashvili ◽  
Aleksandre Surmava ◽  
Vepkhia Kukhalashvili
Keyword(s):  
Black Sea ◽  
Atmospheric Dynamics ◽  
Scale Model ◽  
Necessary Condition ◽  
The Black Sea ◽  
Limited Area ◽  
Full System ◽  
The Caucasus ◽  
Caucasus Region ◽  
Basin Scale

"At the modern stage of the development of Geosciences, the study of hydrothermodynamic and ecological processes occurring in the natural environment (sea, atmosphere, soil), their monitoring and forecasting become very relevant and are a necessary condition for sustainable development of society. The Caucasus region is one of the most difficult regions of the world from the point of view its physical and geographical features. These features include the Black and Caspian Seas and the complex terrain of the Caucasus. The Seas and the atmosphere are unified hydrodynamic systems, between subsystems of which processes of an exchange of energies, momentum and substances continuously take place. One of the most effective ways to study natural and environmental processes is methods of mathematical modeling, which allows reproducing these processes and phenomena and studying the quantitative contribution of various factors to the development of such processes. The purpose of the paper is to discuss the models of the Black Sea and atmospheric dynamics developed at M. Nodia Institute of Geophysics of I. Javakhishvili Tbilisi State University, and some results of their implementation. The model of the Black Sea dynamics is based on a full system of ocean hydro-thermodynamics equations. Its high-resolution version, which is nested in the basin-scale model of the Black Sea dynamics of Marine Hydrophysical Institute (MHI, Sevastopol), is used to forecast main hydrophysical fields for the easternmost part of the Black Sea. The model of the atmospheric dynamics is based on a full system of atmospheric hydro-thermodynamics equations in hydrostatic approximation written in the terrain-following coordinate system and is realized for the extended territory including the eastern part of the Mediterranean Sea and Black and Caspian seas and for the Caucasus region. These models, after some modification will form the basis of the coupled Black Sea-atmosphere limited-area modeling system."

MARINE FORECAST FOR THE EASTERNMOST PART OF THE BLACK SEA

2021 ◽  
Author(s):  
Demuri Demetrashvili ◽  
Vepkhia Kukhalashvili ◽  
Diana Kvaratskhelia ◽  
Aleksandre Surmava
Keyword(s):  
Black Sea ◽  
Splitting Method ◽  
Equation System ◽  
Water Area ◽  
Regional Model ◽  
Scale Model ◽  
The Black Sea ◽  
Marine Hydrophysical Institute ◽  
Basin Scale ◽  
Short Term Forecasting

Modelling and forecasting of dynamic processes and distribution of various substances of anthropogenic and natural origin in coastal and shelf zones of the seas and oceans are of great interest due to the high anthropogenic load of these zones. The aim of this paper is to present some examples of modelling and short-term forecasting of dynamic fields – the current, temperature and salinity in the easternmost Black Sea covering Georgian sector of the Black Sea and adjacent water area using a high-resolution regional model of the Black Sea dynamics. The z-level regional model is based on a full system of ocean hydro-thermodynamics equations and is nested in the basin-scale model of the Black Sea dynamics of Marine Hydrophysical Institute (Sevastopol). To solve the model equation system, a numerical algorithm based on the splitting method is used. Calculations show that circulation processes in the easternmost water area of the Black Sea are characterized by a permanent alternation of different circulation modes with the formation of mesoscale and submesoscale eddies throughout the year, which significantly affect the formation of thermohaline fields; atmospheric wind forcing substantially determines not only the peculiarities of the sea surface horizontal circulation, also the vertical structure of the current field.

scholarly journals Operative forecast of hydrophysical fields in the Georgian Black Sea coastal zone within the ECOOP

2011 ◽  
Vol 8 (1) ◽  
pp. 397-433 ◽  
Author(s):  
A. A. Kordzadze ◽  
D. I. Demetrashvili
Keyword(s):  
High Resolution ◽  
Black Sea ◽  
Surface Wind ◽  
Scale Model ◽  
The Black Sea ◽  
Time Step ◽  
Regional Area ◽  
Study Results ◽  
Basin Scale ◽  
Forecasting System

Abstract. One of the part of the Black Sea Nowcasting/Forecasting System is the regional forecasting system for the Easternmost part of the Black Sea (including the Georgian water area), which have been developed within the context of the EU International projects ARENA and ECOOP. A core of the regional system is a high-resolution baroclinic regional model of the Black Sea dynamics developed at M. Nodia Institute of Geophysics (RM-IG). This model is nested in the basin-scale model (BSM) of Marine Hydrophysical Institute (MHI, Sevastopol/Ukraine). The regional area is limited to the Caucasian and Turkish coastal lines and the western liquid boundary coinciding with a meridian 39.36° E. Since June 2010 we regularly compute 3 days' forecasts of current, temperature and salinity for the Easternmost part of the Black Sea with 1 km spacing. In this study results of two forecasts are presented. The first forecast corresponds to Summer season and covers the prognostic interval from 00:00 h, 6 August to 00:00 h, 9 August 2010. The second one corresponds to Autumn season and covers the prognostic interval from 00:00 h, 26 October to 00:00 h, 29 October 2010. Data needed for the forecasts – the 3-D initial and prognostic hydrophysical fields, also 2-D prognostic meteorological fields at the sea surface, wind stress, heat fluxes, evaporation and precipitation rates for the our regional area are placing on the MHI server every day and we are available to use these data operatively. Prognostic hydrophysical fields are results of forecast by BSM of MHI and 2-D meteorological boundary fields represent results of forecast by regional atmospheric model ALADIN. All these fields are given on the grid of BSM with 5 km spacing and with one-hour time step frequency for the integration period. The analysis of predicted fields shows that to use the model with high resolution is very important factor for identification of nearshore eddies of small sizes. It should be noted very different character of regional circulation in summer and autumn seasons in the Easternmost part of the Black Sea.

scholarly journals Operational forecast of hydrophysical fields in the Georgian Black Sea coastal zone within the ECOOP

Ocean Science ◽  
2011 ◽  
Vol 7 (6) ◽  
pp. 793-803 ◽  
Author(s):  
A. A. Kordzadze ◽  
D. I. Demetrashvili
Keyword(s):  
High Resolution ◽  
Black Sea ◽  
Surface Wind ◽  
Scale Model ◽  
Open Boundary ◽  
The Black Sea ◽  
Time Step ◽  
Regional Area ◽  
Basin Scale ◽  
Forecasting System

Abstract. One of the parts of the Black Sea Nowcasting/Forecasting System is the regional forecasting system for the easternmost part of the Black Sea (including the Georgian water area), which has been developed within the context of the EU International projects ARENA and ECOOP. A core of the regional system is a high-resolution baroclinic regional model of the Black Sea dynamics developed at M. Nodia Institute of Geophysics (RM-IG). This model is nested in the basin-scale model of Marine Hydrophysical Institute (MHI, Sevastopol/Ukraine). The regional area is limited to the Caucasian and Turkish coastal lines and the western liquid boundary coinciding with the meridian 39.36° E. Since June 2010 we have regularly been computing 3 days' forecasts of current, temperature and salinity for the easternmost part of the Black Sea with 1 km spacing. In this study the results of two forecasts are presented. The first forecast corresponds to summer season and covers the prognostic interval from 00:00 h, 6 August to 00:00 h, 9 August 2010. The second one corresponds to autumn season and covers the prognostic interval from 00:00 h, 26 October to 00:00 h, 29 October 2010. Data needed for the forecasts – the initial and prognostic hydrophysical fields on the open boundary, also 2-D prognostic meteorological fields at the sea surface – wind stress, heat fluxes, evaporation and precipitation rates for our regional area are being placed on the MHI server every day and we are available to use these data operatively. Prognostic hydrophysical fields are results of forecast by the basin-scale model of MHI and 2-D meteorological boundary fields represent the results of forecast by regional atmospheric model ALADIN. All these fields are given on the grid of basin-scale model with 5 km spacing and with one-hour time step frequency for the integration period. The analysis of predicted fields shows that to use the model with high resolution is very important factor for identification of nearshore eddies of small sizes. It should be noted the very different character of regional circulation in summer and autumn seasons in the easternmost part of the Black Sea.

scholarly journals Using the results of the deep geodynamic model of the Black Sea-Caucasus region for the search for new oil and gas area

2021 ◽  
Author(s):  
С.В. Гаврилов ◽  
А.Л. Харитонов
Keyword(s):  
Black Sea ◽  
Oil And Gas ◽  
Mantle Wedge ◽  
Oil And Gas Industry ◽  
Ore Deposits ◽  
The Black Sea ◽  
The Caucasus ◽  
Gas Industry ◽  
The Sustainable Development ◽  
Caucasus Region

Для устойчивого развития нефтегазовой промышленности Кавказского реги- она необходимо использовать все имеющиеся геолого-геофизические данные, в том числе и данные глубинных геодинамических исследований. На основе данных о конвективном выносе тепла из мантийного клина к 2D аномалии теплового потока, наблюдаемой на территории Кавказа, произведена оценка угла наклона мантийного клина и скорости субдукции Черно- морской литосферной микроплиты под литосферу Кавказского региона). Восходящие кон- вективные движения в мантии могут выносить мантийные известково-щелочные магмы (с содержащимися в них углеводородами) в приповерхностные слои осадочного чехла, и, следо- вательно, месторождения нефти и газа, должны быть приурочены к зонам, расположенным над конвективными вихрями. For the sustainable development of the oil and gas industry in the Caucasus region, it is necessary to use all available geological and geophysical data, including data from deep geodynamic studies. On the basis of data of convective carrying out of heat from a mantle wedge to 2D anomaly of a heat fl ux observed in the back of the territory of the Caucasus assessment of the angle of mantle wedge and speed of the subduction of the Black Sea the lithospheric micro plate under the lithosphere of the Caucasian region) is made. The ascending convective movements in the mantle can take out mantle calc-alkali magmas (with the metals which are contained in them) to a day surface, and, therefore, ore deposits probably have to be dated for zones of the raised heat fl ux, located over convective fl ows.

MODELING OF VARIABILITY OF THE REGIONAL DYNAMIC PROCESSES DEVELOPED DURING 2017-2019 IN THE EASTERNMOST PART OF THE BLACK SEA

2020 ◽  
Author(s):  
Demuri Demetrashvili ◽  
Vepkhia Kukhalashvili ◽  
Aleksandre Surmava ◽  
Diana Kvaratskhelia
Keyword(s):  
Black Sea ◽  
Practical Interest ◽  
Temporal Distribution ◽  
Scale Model ◽  
Dynamic Processes ◽  
The Black Sea ◽  
Coastal Zones ◽  
Marine Hydrophysical Institute ◽  
Regional Dynamic ◽  
Basin Scale

The study of water circulation and thermohaline processes in the coastal zones of the seas and oceans, subjected to the most intense anthropogenic press, is an important problem of modern Oceanology. According to experimental and theoretical researches the coastal water areas of the Black Sea are dynamically active regions, where intensive generation of mesoscale and submesoscale eddies takes place. Such eddies make a significant contribution to the horizontal and vertical transport of different polluting substances, heat, momentum, etc. Therefore, the modeling and study of main peculiarities of variability of regional dynamic processes is of great scientific and practical interest. The goal of this study is to investigate numerically the structure and spatial –temporal distribution of the sea flow and thermohaline fields taking place during the period 2017-2019 in the easternmost part of the Black Sea, which is limited from the open part of the sea basin with liquid boundary coinciding 39.080E. With this purpose a high-resolution numerical regional model of the Black Sea dynamics of M. Nodia Institute of Geophysics of I. Javakhishvili Tbilisi State University (RM-IG) is used. The RM-IG is nested in the basin-scale model of the Black Sea dynamics of Marine Hydrophysical Institute (Sevastopol) and is based on a primitive system of ocean hydrothermodynamics equations. The RM-IG uses a calculated grid having 215x347 points on horizons with 1 km spatial resolution. Results of researches presented in the paper show significant variability of the regional dynamic processes in the easternmost water area during 2017-2019, where continuously generation, deformation and disappearance of the cyclonic and anticyclonic vortex formations of difference sizes takes plac

Basin scale spatiotemporal analysis of shoreline change in the Black Sea

2021 ◽  
Vol 252 ◽  
pp. 107247
Author(s):  
Tahsin Görmüş ◽  
Berna Ayat ◽  
Burak Aydoğan ◽  
Florin Tătui
Keyword(s):  
Black Sea ◽  
Shoreline Change ◽  
Spatiotemporal Analysis ◽  
The Black Sea ◽  
Basin Scale
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