Konstantin Korotenko - Academia.edu (original) (raw)

Papers by Konstantin Korotenko

Oil Spill Risk Management, 2014

Springer eBooks, Sep 27, 2013

The submarine groundwater discharge (SGD) transports a significant amount of various contaminants... more The submarine groundwater discharge (SGD) transports a significant amount of various contaminants into the coastal zone especially in tsunami affected areas. An assessment of the impact of intruded pollutants in the coastal ecosystems requires understanding the fate of the pollutants and processes of their dispersal in ambient waters. In this paper, we proposed a methodology for SGD data collection and data assessment, using different methods, technology, techniques and instruments as well as the 3-D coupled ocean circulation/particle-tracking model for assessment and predicting the transport and dispersal of pollution-containing SGD into a coastal environment. Among the proposed methods to use for data collection and the SGD assessment primary attention was paid to geophysical, hydrologic, remote sensing and hydro-geologic measurements, using natural radiotracers, measurements by seepage meters and benthic chambers, biogeochemical and biological measurements. Also, several new modeling approaches were considered in particular those which use the particle-tracking model. The particle-tracking model takes currents and turbulent diffusivities predetermined by the ocean circulation model and uses the Lagrangian approach to predict the motion of individual droplets, the sum of which constitutes a contaminant plume which is the result of discharge of contaminant-rich submarine groundwater. Presently, we limited our simulations to elucidate the effect of tides on the SGD/nitrate plume formation. The model predicts behaviour of a nitrate plume, its shape and variation during a tidal cycle in the shallow waters. The model can be used to predict contamination of coastal waters with various pollutants incoming with SGD in the aftermath of a tsunami when impact of the latter on aquifers can be significant.

Modeling Gulf of Mexico Circulation and Oil Dispersal, 2014

Remote Sensing

The northeastern part of the cyclonic Rim Current, which encircles the entire basin of the Black ... more The northeastern part of the cyclonic Rim Current, which encircles the entire basin of the Black Sea, is named as the Northeast Caucasian Current. It periodically approaches the coast, triggering the formation of topographic generated eddies, including long-living isolated anticyclonic eddies and short-living multiple anticyclonic eddies, which group and merge into eddy chain structures. Both types of eddies affect coastal dynamics and interact with multiple river plumes formed in the study area. This interaction determines cross- and along-shelf transport of fluvial water, enhancing the processes of self-cleaning of the coastal zone. In this study, we used a 3D low-dissipation model, DieCAST, coupled with a Lagrangian particle tracking model, and supported by analysis of satellite images, to study the generation and evolution of eddy chains and their interaction with river plumes along the Caucasian coast. Using Fourier and wavelet analyses of kinetic energy time series, we reveale...

Remote Sensing

The Northeast Caucasian Current (NCC) is the northeastern part of the cyclonic Rim Current (RC) i... more The Northeast Caucasian Current (NCC) is the northeastern part of the cyclonic Rim Current (RC) in the Black Sea. As it sometimes approaches the narrow shelf very closely, topographically generated cyclonic eddies (TGEs) can be triggered. These eddies contribute to intense, along- and cross-shelf transport of trapped water with enhanced self-cleaning effects of the coastal zone. Despite intense studies of eddy dynamics in the Black Sea, the mechanisms of the generation of such coastal eddies, their unpredictability, and their capacity to capture and transport impurities are still poorly understood. We applied a 3-D low-dissipation model DieCAST/Die2BS coupled with a Lagrangian particle transport model supported by analysis of optical satellite images to study generation and evolution of TGEs and their effect on river plumes unevenly distributed along the northeastern Caucasian coast. Using the Furrier and wavelet analyses of kinetic energy time series, it was revealed that the occur...

Frontiers in Marine Science, 2020

The 3-D Princeton Ocean Model with tidal forcing supplied by a 2-D barotropic model was used to e... more The 3-D Princeton Ocean Model with tidal forcing supplied by a 2-D barotropic model was used to examine the time-depth variability and features of tidal current, turbulence, and power of tidal stream energy in the Taiwan Strait (TS). A number of potential tidal stream sites for the kinetic energy conversion were identified. Numerical simulations showed that semidiurnal tidal currents are predominant in the TS, with along-channel maximum amplitude reaching 1.3 m s −1. The modeling revealed multicore eddy structures generated by the ebb and flood flows over the Chang-Yuen Rise (CYR). The eddy structures were found to contain filaments with different vorticities, positions, and signs, which depend on the phase of the tide. The maximum of absolute relative vorticity was estimated to reach 100 rad/week. During the flood-ebb cycle, the turbulence exhibited symmetry over the CYR and in the Peng-Hu Channel (PHC), while in the crossslope direction south from the CYR it was asymmetrical, changing from ebb-dominant to flood-dominant. The maximum values of eddy diffusivity within the bottom boundary layer ranged from ∼10 −3 to 10 −2 m 2 s −1. A numerical simulation revealed that, in the PHC, bottom shear turbulence on the flood is suppressed by strong stratification due to the inflow of dense water from the South China Sea. An assessment of power density revealed several potentially attractive sites for the installation of tidal turbines in the vicinity and over the CYR. Tidal currents at these sites are characterized by insignificant flood/ebb asymmetry and the magnitude of power density reached 100 Wm −2. The most promising site for tidal energy converter installations was identified in the northern extremity of the PHC, where the magnitude of power density reached 300 Wm −2 .

Hydrology and Earth System Sciences Discussions, 2016

Internal standing waves (seiches) in the South Aral Sea are studied for the first time. The study... more Internal standing waves (seiches) in the South Aral Sea are studied for the first time. The study, based on numerical simulations and field data and, focuses on two different campaigns: the first in autumn 2006, when the stratification was weak, and the second in autumn 2013, when it was strong. During this time, the sea surface level decreased 3.2 m but differences in stratification depend only on the time when the campaigns were carried out because the maximum density gradient decreases even though the sea continues to become saltier. In 2006 there was a mild prevailing northeasterly 10 wind and in 2013 a mild easterly wind. The fundamental modes were identified as 36 h and 14 h, respectively. For both years we focused on the sub-inertial modes which were found to be either second or third vertical modes. In general, the vertical modes in 2013 are higher because of the strong stratification. For both years, it was found that the quasi homogeneous mixed deep upper layer could sustain internal waves under mild wind conditions. Regarding the horizontal structure, in 2006 they are first and second modes and in 2013 second and third horizontal modes. The results suggest that, 15 due to sea level variations, the neck connecting the Chernyshev Bay to the main body of the lake can become critical for the development a nodal line in that neck..

Spill Science & Technology Bulletin, 2000

A 3-D hybrid¯ow/transport model has been developed to predict the dispersal of oil pollution in c... more A 3-D hybrid¯ow/transport model has been developed to predict the dispersal of oil pollution in coastal waters. The transport module of the model takes predetermined current and turbulent diusivities and uses Lagrangian tracking to predict the motion of individual particles (droplets), the sum of which constitute a hypothetical oil spill. Currents and turbulent diusivities used in the model have been generated by a numerical ocean circulation model (Princeton ocean model) implemented for the Caspian Sea. The basic processes aecting the fate of the oil spill are taken into account and parameterized in the transport model. The hybrid model is implemented for a simulated continuous release in the coastal waters of the Caspian Sea. The potential of the model for the prediction of the advective and turbulent transport and dispersal of oil spills is demonstrated.

Ocean Science, 2012

Wind and wave effects on tidal current structure and turbulence throughout the water column are e... more Wind and wave effects on tidal current structure and turbulence throughout the water column are examined using an upward-looking acoustic Doppler current profiler (ADCP). The instrument has been deployed on the seafloor of 18-m mean depth, off the northeastern French coast in the eastern English Channel, over 12 tidal cycles, and covered the period of the transition from mean spring to neap tide, and forcing regimes varied from calm to moderate storm conditions. During storms, we observed gusty winds with magnitudes reaching 15 m s −1 and wave heights reaching up to 1.3 m. Analysis of velocity spectra revealed a noticeable contribution of wind-induced waves to spectral structure of velocity fluctuations within the subsurface layer. Near the surface, stormy winds and waves produced a significant intensification of velocity fluctuations, particularly when the sustained wind blew against the ebb tide flow. As during wavy periods, the variance-derived Reynolds stress estimates might include a wave-induced contamination, we applied the Variance Fit method to obtain unbiased stresses and other turbulent quantities. Over calm periods, the turbulent quantities usually decreased with height above the seabed. The stresses were found to vary regularly with the predominantly semidiurnal tidal flow. The along-shore stress being generally greater during the flood flow (∼ 2.7 Pa) than during the ebb flow (∼ −0.6 Pa). The turbulent kinetic energy production rate, P , and eddy viscosity, A z , followed a nearly regular cycle with close to a quarter-diurnal period. As for the stresses, near the seabed, we found the maximum values of estimated quantities of P and A z to be 0.1 Wm −3 and 0.5 m 2 s −1 , respectively, during the flood flow. Over the storm periods, we found the highest unbiased stress values (∼ −2.6 Pa) during ebb when tidal currents were opposite to the southwesterly winds while, during the flood, the surface stresses slightly exceeded those estimated for a calm period. A comparison of obtained results gives a good agreement with those of other researchers working on direct measurements of turbulence in tidal flows.

Continental Shelf Research, 2012

The sustainable management of coastal marine environments requires a comprehensive understanding ... more The sustainable management of coastal marine environments requires a comprehensive understanding of the processes related to material transport from land to coastal sea. Besides surface water discharge (e.g., rivers and storm drains), submarine groundwater discharge (SGD) plays a key role since it provides a major pathway for solute and particulate transport of contaminants and nutrients, both having considerable potential to cause deterioration of the overall ecological status of coastal environments. The aim of the presented study was the investigation of SGD in two exemplary and dissimilar areas at the Black Sea coast, one in the west (Romania) and one in the east (Georgia). The approach included the assessment of the geological/geographical setting regarding the potential of SGD occurrence, the use of environmental tracer data (222 Rn, δ 18 O, δ 2 H, salinity), and the evaluation of sea surface temperature patterns near the coastline using satellite data. Besides the individual site specific results, the study revealed that a combined evaluation of tracer data and satellite based information allows SGD localization with satisfying precision. A downscaling approach starting with large scale satellite data is generally recommended, continuing with medium scale tracer patterns and ending with local spot sampling.

This report summarizes the work accomplished during the second year of a three-year project to de... more This report summarizes the work accomplished during the second year of a three-year project to develop a state of the art, integrated environmental monitoring and modeling system to provide data and information to support the operation, management, and evaluation of various land and marine based transportation systems in Rhode Island (RI). The system, TRANSMAP (Transportation Mapping and Analysis Program), features an open architecture, industry standard software tools and modules, an embedded geographic information system (GIS), standardized data handling protocols, an environmental data analysis and presentation system, and access for linkage to models and management tools. The second year project objectives were to (1) complete access to the RI roadway weather information system data and add an additional weather and pavement monitoring system with a remote processing unit to enhance the RI Department of Transportation network, (2) extend and improve TRANSMAP by enhancing its dat...

Geofizika, 2009

The goal of this research was to simulate and analyze the response of the Western Adriatic Curren... more The goal of this research was to simulate and analyze the response of the Western Adriatic Current (WAC) to an abnormal event that occurred in the Adriatic Sea in mid-summer of 2003. At this time, a combination of extremely low discharge from the Po River and from other northwestern rivers caused by the prolonged dry season and the dominant Sirocco wind produced an ðunusual’ upwelling and caused the WAC to reverse along the northern and central Italian coasts. The simulations employed a high-resolution, low dissipative version of the DieCAST circulation model that was initialized with monthly averaged temperature and salinity data and spun up with a use of climatological wind data. Numerical experiments were performed with the use of COAMPS wind stress and heat flux data. The model runs performed under Sirocco wind forcing in combination with low river discharge (a quarter of the climatic mean) revealed that such these conditions do trigger upwelling and the reversal of the WAC alon...

A high-frequency (1.2 MHz) four-beam Acoustic Doppler Current Profiler (ADCP) moored on the seabe... more A high-frequency (1.2 MHz) four-beam Acoustic Doppler Current Profiler (ADCP) moored on the seabed has been used direct measurement turbulence in a shallow coastal zone of the eastern English Channel over four tidal cycles at period of development of the spring tide. As measurements and estimations have shown, the Reynolds stresses were found to vary regularly with the predominantly semidiurnal tidal flow with the stresses on the ebb flow (up to + 1.5 Pa) being generally greater than on the flood flow (-1.2 Pa). Turbulent kinetic energy () and its production rate (P) followed a regular cycle with the quarter-diurnal period and maximum values about 0.03 m2/s2 0.8 W/m3 respectively near the bed during ebb flow and decreasing sharply with height. and P were generally lowest 2•10-3 m2/s2 3•10-5 W/m3 respectively during the current reversal of low water, which matches a rapid transition from flood to ebb.

Preparing the revised article, we conducted new computations aimed at assessing the contribution ... more Preparing the revised article, we conducted new computations aimed at assessing the contribution of buoyant production/destruction rate term in the equation of the TKE budget, and included these results to the manuscript in order to demonstrate that the “competition” between shear-production and buoyant destruction rates played a dominant role in the formation of the differences in the behavior of the two plumes. To this end, we substituted Fig. 9 by a new one with a plot of two zonal sections of buoyant destruction rate for both river plumes during the tidal cycle. The sections revealed greater suppression of turbulent energy by buoyancy in the upper 15 m depth during formation/evolution of Wu River’s plume than those occurred during development of the plume of Zhoushui River. We also added an evaluation of horizontal Richardson number. The latter helped to explain the considerable dissimilarity of stratification development in the area of Zhuoshui and Wu Rivers associated directly...

PeerJ, Aug 29, 2018

Because of the environmental sensitivity of the Black Sea, as a semi-enclosed sea, any subsea oil... more Because of the environmental sensitivity of the Black Sea, as a semi-enclosed sea, any subsea oil spill can cause destructive impacts on the marine environment and beaches. Employing numerical modeling as a prediction tool is one of the most efficient methods to understand oil spill behavior under various environmental forces. In this regard, a coupled circulation/deepsea oil spill model has been applied to the Black Sea to address the behavior of the oil plume resulting from a representative hypothetical deepwater blowout. With climatological forcing, the hydrodynamic module based on DieCAST ocean circulation model realistically reproduces seasonally-varying circulation from basin-scale dominant structures to meso-and sub-mesoscale elements. The oil spill model utilizes pre-calculated DieCAST thermo-hydrodynamic fields and uses a Lagrangian tracking algorithm for predicting the displacement of a large number of seeded oil droplets, the sum of which forms the rising oil plume resulting from a deepwater blowout. Basic processes affecting the transport, dispersal of oil and its fate in the water column are included in the coupled model. A hypothetical oil source was set at the bottom, at the northwestern edge of the Shatsky Ridge in the area east of the Crimea Peninsula where the oil exploration/ development is likely to be planned. Goals of the study are to elucidate the behavior of the subsea oil plume and assess scales of contamination of marine environment and coastlines resulting from potential blowouts. The two 20-day scenarios with the oil released by a hypothetical blowout were examined to reveal combined effects of the basin-scale current, near-shore eddies, and winds on the behavior of the rising oil plume and its spreading on the surface. Special attention is paid to the Caucasian near-shore anticyclonic eddy which is able to trap surfacing oil, detain it and deliver it to shores. The length of contaminated coastlines of vulnerable Crimean and Caucasian coasts are assessed along with amounts of oil beached and deposited. Subjects Environmental Contamination and Remediation, Environmental Impacts Keywords Circulation/oil spill modeling, Deepwater oil blowout, Black Sea, Mesoscale structures, Near-shore anticyclonic eddies, Coastline contamination assessment, Black Sea circulation How to cite this article Korotenko (2018), Effects of mesoscale eddies on behavior of an oil spill resulting from an accidental deepwater blowout in the Black Sea: an assessment of the environmental impacts. PeerJ 6:e5448;

Поступила в редакцию 22.06.2016 г.

Oil Spill Risk Management, 2014

Springer eBooks, Sep 27, 2013

The submarine groundwater discharge (SGD) transports a significant amount of various contaminants... more The submarine groundwater discharge (SGD) transports a significant amount of various contaminants into the coastal zone especially in tsunami affected areas. An assessment of the impact of intruded pollutants in the coastal ecosystems requires understanding the fate of the pollutants and processes of their dispersal in ambient waters. In this paper, we proposed a methodology for SGD data collection and data assessment, using different methods, technology, techniques and instruments as well as the 3-D coupled ocean circulation/particle-tracking model for assessment and predicting the transport and dispersal of pollution-containing SGD into a coastal environment. Among the proposed methods to use for data collection and the SGD assessment primary attention was paid to geophysical, hydrologic, remote sensing and hydro-geologic measurements, using natural radiotracers, measurements by seepage meters and benthic chambers, biogeochemical and biological measurements. Also, several new modeling approaches were considered in particular those which use the particle-tracking model. The particle-tracking model takes currents and turbulent diffusivities predetermined by the ocean circulation model and uses the Lagrangian approach to predict the motion of individual droplets, the sum of which constitutes a contaminant plume which is the result of discharge of contaminant-rich submarine groundwater. Presently, we limited our simulations to elucidate the effect of tides on the SGD/nitrate plume formation. The model predicts behaviour of a nitrate plume, its shape and variation during a tidal cycle in the shallow waters. The model can be used to predict contamination of coastal waters with various pollutants incoming with SGD in the aftermath of a tsunami when impact of the latter on aquifers can be significant.

Modeling Gulf of Mexico Circulation and Oil Dispersal, 2014

Remote Sensing

The northeastern part of the cyclonic Rim Current, which encircles the entire basin of the Black ... more The northeastern part of the cyclonic Rim Current, which encircles the entire basin of the Black Sea, is named as the Northeast Caucasian Current. It periodically approaches the coast, triggering the formation of topographic generated eddies, including long-living isolated anticyclonic eddies and short-living multiple anticyclonic eddies, which group and merge into eddy chain structures. Both types of eddies affect coastal dynamics and interact with multiple river plumes formed in the study area. This interaction determines cross- and along-shelf transport of fluvial water, enhancing the processes of self-cleaning of the coastal zone. In this study, we used a 3D low-dissipation model, DieCAST, coupled with a Lagrangian particle tracking model, and supported by analysis of satellite images, to study the generation and evolution of eddy chains and their interaction with river plumes along the Caucasian coast. Using Fourier and wavelet analyses of kinetic energy time series, we reveale...

Remote Sensing

The Northeast Caucasian Current (NCC) is the northeastern part of the cyclonic Rim Current (RC) i... more The Northeast Caucasian Current (NCC) is the northeastern part of the cyclonic Rim Current (RC) in the Black Sea. As it sometimes approaches the narrow shelf very closely, topographically generated cyclonic eddies (TGEs) can be triggered. These eddies contribute to intense, along- and cross-shelf transport of trapped water with enhanced self-cleaning effects of the coastal zone. Despite intense studies of eddy dynamics in the Black Sea, the mechanisms of the generation of such coastal eddies, their unpredictability, and their capacity to capture and transport impurities are still poorly understood. We applied a 3-D low-dissipation model DieCAST/Die2BS coupled with a Lagrangian particle transport model supported by analysis of optical satellite images to study generation and evolution of TGEs and their effect on river plumes unevenly distributed along the northeastern Caucasian coast. Using the Furrier and wavelet analyses of kinetic energy time series, it was revealed that the occur...

Frontiers in Marine Science, 2020

The 3-D Princeton Ocean Model with tidal forcing supplied by a 2-D barotropic model was used to e... more The 3-D Princeton Ocean Model with tidal forcing supplied by a 2-D barotropic model was used to examine the time-depth variability and features of tidal current, turbulence, and power of tidal stream energy in the Taiwan Strait (TS). A number of potential tidal stream sites for the kinetic energy conversion were identified. Numerical simulations showed that semidiurnal tidal currents are predominant in the TS, with along-channel maximum amplitude reaching 1.3 m s −1. The modeling revealed multicore eddy structures generated by the ebb and flood flows over the Chang-Yuen Rise (CYR). The eddy structures were found to contain filaments with different vorticities, positions, and signs, which depend on the phase of the tide. The maximum of absolute relative vorticity was estimated to reach 100 rad/week. During the flood-ebb cycle, the turbulence exhibited symmetry over the CYR and in the Peng-Hu Channel (PHC), while in the crossslope direction south from the CYR it was asymmetrical, changing from ebb-dominant to flood-dominant. The maximum values of eddy diffusivity within the bottom boundary layer ranged from ∼10 −3 to 10 −2 m 2 s −1. A numerical simulation revealed that, in the PHC, bottom shear turbulence on the flood is suppressed by strong stratification due to the inflow of dense water from the South China Sea. An assessment of power density revealed several potentially attractive sites for the installation of tidal turbines in the vicinity and over the CYR. Tidal currents at these sites are characterized by insignificant flood/ebb asymmetry and the magnitude of power density reached 100 Wm −2. The most promising site for tidal energy converter installations was identified in the northern extremity of the PHC, where the magnitude of power density reached 300 Wm −2 .

Hydrology and Earth System Sciences Discussions, 2016

Internal standing waves (seiches) in the South Aral Sea are studied for the first time. The study... more Internal standing waves (seiches) in the South Aral Sea are studied for the first time. The study, based on numerical simulations and field data and, focuses on two different campaigns: the first in autumn 2006, when the stratification was weak, and the second in autumn 2013, when it was strong. During this time, the sea surface level decreased 3.2 m but differences in stratification depend only on the time when the campaigns were carried out because the maximum density gradient decreases even though the sea continues to become saltier. In 2006 there was a mild prevailing northeasterly 10 wind and in 2013 a mild easterly wind. The fundamental modes were identified as 36 h and 14 h, respectively. For both years we focused on the sub-inertial modes which were found to be either second or third vertical modes. In general, the vertical modes in 2013 are higher because of the strong stratification. For both years, it was found that the quasi homogeneous mixed deep upper layer could sustain internal waves under mild wind conditions. Regarding the horizontal structure, in 2006 they are first and second modes and in 2013 second and third horizontal modes. The results suggest that, 15 due to sea level variations, the neck connecting the Chernyshev Bay to the main body of the lake can become critical for the development a nodal line in that neck..

Spill Science & Technology Bulletin, 2000

A 3-D hybrid¯ow/transport model has been developed to predict the dispersal of oil pollution in c... more A 3-D hybrid¯ow/transport model has been developed to predict the dispersal of oil pollution in coastal waters. The transport module of the model takes predetermined current and turbulent diusivities and uses Lagrangian tracking to predict the motion of individual particles (droplets), the sum of which constitute a hypothetical oil spill. Currents and turbulent diusivities used in the model have been generated by a numerical ocean circulation model (Princeton ocean model) implemented for the Caspian Sea. The basic processes aecting the fate of the oil spill are taken into account and parameterized in the transport model. The hybrid model is implemented for a simulated continuous release in the coastal waters of the Caspian Sea. The potential of the model for the prediction of the advective and turbulent transport and dispersal of oil spills is demonstrated.

Ocean Science, 2012

Wind and wave effects on tidal current structure and turbulence throughout the water column are e... more Wind and wave effects on tidal current structure and turbulence throughout the water column are examined using an upward-looking acoustic Doppler current profiler (ADCP). The instrument has been deployed on the seafloor of 18-m mean depth, off the northeastern French coast in the eastern English Channel, over 12 tidal cycles, and covered the period of the transition from mean spring to neap tide, and forcing regimes varied from calm to moderate storm conditions. During storms, we observed gusty winds with magnitudes reaching 15 m s −1 and wave heights reaching up to 1.3 m. Analysis of velocity spectra revealed a noticeable contribution of wind-induced waves to spectral structure of velocity fluctuations within the subsurface layer. Near the surface, stormy winds and waves produced a significant intensification of velocity fluctuations, particularly when the sustained wind blew against the ebb tide flow. As during wavy periods, the variance-derived Reynolds stress estimates might include a wave-induced contamination, we applied the Variance Fit method to obtain unbiased stresses and other turbulent quantities. Over calm periods, the turbulent quantities usually decreased with height above the seabed. The stresses were found to vary regularly with the predominantly semidiurnal tidal flow. The along-shore stress being generally greater during the flood flow (∼ 2.7 Pa) than during the ebb flow (∼ −0.6 Pa). The turbulent kinetic energy production rate, P , and eddy viscosity, A z , followed a nearly regular cycle with close to a quarter-diurnal period. As for the stresses, near the seabed, we found the maximum values of estimated quantities of P and A z to be 0.1 Wm −3 and 0.5 m 2 s −1 , respectively, during the flood flow. Over the storm periods, we found the highest unbiased stress values (∼ −2.6 Pa) during ebb when tidal currents were opposite to the southwesterly winds while, during the flood, the surface stresses slightly exceeded those estimated for a calm period. A comparison of obtained results gives a good agreement with those of other researchers working on direct measurements of turbulence in tidal flows.

Continental Shelf Research, 2012

The sustainable management of coastal marine environments requires a comprehensive understanding ... more The sustainable management of coastal marine environments requires a comprehensive understanding of the processes related to material transport from land to coastal sea. Besides surface water discharge (e.g., rivers and storm drains), submarine groundwater discharge (SGD) plays a key role since it provides a major pathway for solute and particulate transport of contaminants and nutrients, both having considerable potential to cause deterioration of the overall ecological status of coastal environments. The aim of the presented study was the investigation of SGD in two exemplary and dissimilar areas at the Black Sea coast, one in the west (Romania) and one in the east (Georgia). The approach included the assessment of the geological/geographical setting regarding the potential of SGD occurrence, the use of environmental tracer data (222 Rn, δ 18 O, δ 2 H, salinity), and the evaluation of sea surface temperature patterns near the coastline using satellite data. Besides the individual site specific results, the study revealed that a combined evaluation of tracer data and satellite based information allows SGD localization with satisfying precision. A downscaling approach starting with large scale satellite data is generally recommended, continuing with medium scale tracer patterns and ending with local spot sampling.

This report summarizes the work accomplished during the second year of a three-year project to de... more This report summarizes the work accomplished during the second year of a three-year project to develop a state of the art, integrated environmental monitoring and modeling system to provide data and information to support the operation, management, and evaluation of various land and marine based transportation systems in Rhode Island (RI). The system, TRANSMAP (Transportation Mapping and Analysis Program), features an open architecture, industry standard software tools and modules, an embedded geographic information system (GIS), standardized data handling protocols, an environmental data analysis and presentation system, and access for linkage to models and management tools. The second year project objectives were to (1) complete access to the RI roadway weather information system data and add an additional weather and pavement monitoring system with a remote processing unit to enhance the RI Department of Transportation network, (2) extend and improve TRANSMAP by enhancing its dat...

Geofizika, 2009

The goal of this research was to simulate and analyze the response of the Western Adriatic Curren... more The goal of this research was to simulate and analyze the response of the Western Adriatic Current (WAC) to an abnormal event that occurred in the Adriatic Sea in mid-summer of 2003. At this time, a combination of extremely low discharge from the Po River and from other northwestern rivers caused by the prolonged dry season and the dominant Sirocco wind produced an ðunusual’ upwelling and caused the WAC to reverse along the northern and central Italian coasts. The simulations employed a high-resolution, low dissipative version of the DieCAST circulation model that was initialized with monthly averaged temperature and salinity data and spun up with a use of climatological wind data. Numerical experiments were performed with the use of COAMPS wind stress and heat flux data. The model runs performed under Sirocco wind forcing in combination with low river discharge (a quarter of the climatic mean) revealed that such these conditions do trigger upwelling and the reversal of the WAC alon...

A high-frequency (1.2 MHz) four-beam Acoustic Doppler Current Profiler (ADCP) moored on the seabe... more A high-frequency (1.2 MHz) four-beam Acoustic Doppler Current Profiler (ADCP) moored on the seabed has been used direct measurement turbulence in a shallow coastal zone of the eastern English Channel over four tidal cycles at period of development of the spring tide. As measurements and estimations have shown, the Reynolds stresses were found to vary regularly with the predominantly semidiurnal tidal flow with the stresses on the ebb flow (up to + 1.5 Pa) being generally greater than on the flood flow (-1.2 Pa). Turbulent kinetic energy () and its production rate (P) followed a regular cycle with the quarter-diurnal period and maximum values about 0.03 m2/s2 0.8 W/m3 respectively near the bed during ebb flow and decreasing sharply with height. and P were generally lowest 2•10-3 m2/s2 3•10-5 W/m3 respectively during the current reversal of low water, which matches a rapid transition from flood to ebb.

Preparing the revised article, we conducted new computations aimed at assessing the contribution ... more Preparing the revised article, we conducted new computations aimed at assessing the contribution of buoyant production/destruction rate term in the equation of the TKE budget, and included these results to the manuscript in order to demonstrate that the “competition” between shear-production and buoyant destruction rates played a dominant role in the formation of the differences in the behavior of the two plumes. To this end, we substituted Fig. 9 by a new one with a plot of two zonal sections of buoyant destruction rate for both river plumes during the tidal cycle. The sections revealed greater suppression of turbulent energy by buoyancy in the upper 15 m depth during formation/evolution of Wu River’s plume than those occurred during development of the plume of Zhoushui River. We also added an evaluation of horizontal Richardson number. The latter helped to explain the considerable dissimilarity of stratification development in the area of Zhuoshui and Wu Rivers associated directly...

PeerJ, Aug 29, 2018

Because of the environmental sensitivity of the Black Sea, as a semi-enclosed sea, any subsea oil... more Because of the environmental sensitivity of the Black Sea, as a semi-enclosed sea, any subsea oil spill can cause destructive impacts on the marine environment and beaches. Employing numerical modeling as a prediction tool is one of the most efficient methods to understand oil spill behavior under various environmental forces. In this regard, a coupled circulation/deepsea oil spill model has been applied to the Black Sea to address the behavior of the oil plume resulting from a representative hypothetical deepwater blowout. With climatological forcing, the hydrodynamic module based on DieCAST ocean circulation model realistically reproduces seasonally-varying circulation from basin-scale dominant structures to meso-and sub-mesoscale elements. The oil spill model utilizes pre-calculated DieCAST thermo-hydrodynamic fields and uses a Lagrangian tracking algorithm for predicting the displacement of a large number of seeded oil droplets, the sum of which forms the rising oil plume resulting from a deepwater blowout. Basic processes affecting the transport, dispersal of oil and its fate in the water column are included in the coupled model. A hypothetical oil source was set at the bottom, at the northwestern edge of the Shatsky Ridge in the area east of the Crimea Peninsula where the oil exploration/ development is likely to be planned. Goals of the study are to elucidate the behavior of the subsea oil plume and assess scales of contamination of marine environment and coastlines resulting from potential blowouts. The two 20-day scenarios with the oil released by a hypothetical blowout were examined to reveal combined effects of the basin-scale current, near-shore eddies, and winds on the behavior of the rising oil plume and its spreading on the surface. Special attention is paid to the Caucasian near-shore anticyclonic eddy which is able to trap surfacing oil, detain it and deliver it to shores. The length of contaminated coastlines of vulnerable Crimean and Caucasian coasts are assessed along with amounts of oil beached and deposited. Subjects Environmental Contamination and Remediation, Environmental Impacts Keywords Circulation/oil spill modeling, Deepwater oil blowout, Black Sea, Mesoscale structures, Near-shore anticyclonic eddies, Coastline contamination assessment, Black Sea circulation How to cite this article Korotenko (2018), Effects of mesoscale eddies on behavior of an oil spill resulting from an accidental deepwater blowout in the Black Sea: an assessment of the environmental impacts. PeerJ 6:e5448;

Поступила в редакцию 22.06.2016 г.