A three-dimensional model of water circulation and temperature structure in the Caspian Sea

Nasimi, S; Ghiassi, Reza

doi:10.2495/cenv060251

Cited by 3 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results obtained in this research were agreed the results of other studies in different sea areas (Tuzhilkin and Kosarev, 2005;Zaker et al, 2007;Zavialov et al, 2022). Evaluations of salinity and temperature recorded data showed that the thermohaline structure has vertical and horizontal = ) (Kosarev, 1990;Kosarev and Yablonskaya, 1994;Tuzhilkin et al, 1997;Ibraev et al, 1998;Ibrayev, 2001;Ibrayev et al, 2001;Tuzhilkin and Kosarev, 2004;Nasimi and Ghiassi, 2006;Zounematkermani and Sabbaghyazdi, 2010;Kitazawa and Yang, 2012;Cutroneo et al, 2017;Jamshidi, 2017;Medvedev et al, 2020). The stability frequency is also called stratification frequency.…”

Section: Data Availability Statementsupporting

confidence: 90%

Flow measurement in the southern coast of the Caspian Sea

Jamshidi

2024

Front. Mar. Sci.

View full text Add to dashboard Cite

Oceanographic monitoring was conducted in the southern basin of the Caspian Sea to evaluate the physical structure of seawater and sea currents. This monitoring aimed to gather data and analyze the characteristics of the seawater, including temperature, salinity, density, and other relevant parameters. Additionally, the monitoring also focused on studying the patterns and dynamics of sea currents in the region. The collected data and analysis from this monitoring period provided valuable insights into the oceanographic conditions of the southern basin of the Caspian Sea. During storm events, a high level of correlation between the current and wind data was observed in the southern basin of the Caspian Sea during the 2017-2018 monitoring period. The measured current data indicated that the predominant directions were north (N) and northwest (NW). It was observed that strong gusts predominantly originated from the north (N) and northwest (NW) directions. Additionally, a smaller portion of the strong gusts was observed to come from the South-Southeast (S-SE) direction. These findings indicate that the prevailing wind patterns during the monitoring period were primarily from the north and northwest, with a lesser contribution from the South-Southeast direction. The current profiles observed during the monitoring period in the southern basin of the Caspian Sea were primarily influenced by the general circulation pattern of the region. This circulation pattern played a significant role in shaping the current profiles observed during the measurements. In terms of the surface current speed, the maximum recorded value was approximately 200 cm/s, which occurred in January. This indicates that there were instances of relatively high-speed currents in the southern basin of the Caspian Sea during that time. The evaluation of inter-annual variability in vertical structure and seawater temperature profiles during the monitoring period confirmed the presence of seasonal stratification in the water column of the southern basin of the Caspian Sea. This stratification was observed to consist of different layers, including the surface mixed layer, thermocline, and deep-water layers. The formation of these layers is indicative of the seasonal variations in temperature and density within the water column. The vertical changes in the water’s physical parameters during the monitoring period revealed the formation of stratification in the southern basin of the Caspian Sea. In March, it was observed that the water temperature decreased from 11.5°C at the surface to 8.5°C at a depth of 100 m, indicating the presence of a temperature gradient. As the monitoring progressed into May, the stratification became stronger, with the surface water temperature reaching around 23°C. By August, the surface layer of the sea water experienced a significant increase in temperature, reaching 29°C. These observations highlight the development of stratification and the seasonal variations in water temperature during the monitoring period in spring and summer seasons. The water temperature beneath the thermocline layer, specifically at a depth of 100 meters, was recorded to be around 8-8.5 oC. Additionally, the water salinity in the water column exhibited fluctuations between 12-12.5 (psu). Monitoring and understanding physical properties variations are crucial for assessing the oceanographic conditions and their potential impact on marine ecosystems in the southern basin of the Caspian Sea.

show abstract

Section: Data Availability Statementsupporting

confidence: 90%

Flow measurement in the southern coast of the Caspian Sea

Jamshidi

2024

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…By means of a finite difference method using a coarse grid, Nasimi and Ghiasi (2006) hydrostatically modelled the water circulation and temperature structure in the Caspian Sea. Korotenko et al (2002) used a 3D flow/transport model (POM) to predict the dispersal of oil pollution in coastal waters of the Caspian Sea.…”

Section: Introductionmentioning

confidence: 99%

Conjunction of 2D and 3D modified flow solvers for simulating spatio-temporal wind induced hydrodynamics in the Caspian Sea

Zounemat‐Kermani

Sabbagh-Yazdi

2010

Ocean Sci. J.

View full text Add to dashboard Cite

The main objective of this study is the simulation of flow dynamics in the deep parts of the Caspian Sea, in which the southern and middle deep regions are surrounded by considerable areas of shallow zones. To simulate spatio-temporal wind induced hydrodynamics in deep waters, a conjunctive numerical model consisting of a 2D depth average model and a 3D pseudo compressible model is proposed. The 2D model is applied to determine time dependent free surface oscillations as well as the surface velocity patterns and is conjunct to the 3D flow solver for computing three-dimensional velocity and pressure fields which coverage to steady state for the top boundary condition. The modified 2D and 3D sets of equations are conjunct considering interface shear stresses. Both sets of 2D and 3D equations are solved on unstructured triangular and tetrahedral meshes using the Galerkin Finite Volume Method. The conjunctive model is utilized to investigate the deep currents affected by wind, Coriolis forces and the river inflow conditions of the Caspian Sea. In this study, the simulation of flow field due to major winds as well as transient winds in the Caspian Sea during a period of 6 hours in the winter season has been conducted and the numerical results for water surface level are then compared to the 2D numerical results.

show abstract

Numerical Simulation of the Wind-Induced Current in the Caspian Sea

Mofidi

Hesari

2018

ijcoe

View full text Add to dashboard Cite

A three-dimensional primitive equation model has been developed to study wind-driven currents in the Caspian Sea (CS). The equations were solved in the spherical coordinate system with a vertical array of pressure-sigma using a finite difference Method on a staggered modified Arakawa c grid. Simulations showed that there is an anticyclonic eddy over the deep water of South Caspian Basin (SCB), which extended from surface to subsurface and persist throughout the year. The model successfully produced the coastal current along the eastern coast of the Middle Caspian Basin (MCB) with a prevailing southward component, resulting in upwelling on these coasts to compensate the surface drift. The results indicate that the bottom topography has a key role in steering currents and generated a divergence in the surface Ekman layer which balanced by convergence in the frictional bottom Ekman layer in deepest areas of the CS.

show abstract

A three-dimensional model of water circulation and temperature structure in the Caspian Sea

Cited by 3 publications

References 9 publications

Flow measurement in the southern coast of the Caspian Sea

Flow measurement in the southern coast of the Caspian Sea

Conjunction of 2D and 3D modified flow solvers for simulating spatio-temporal wind induced hydrodynamics in the Caspian Sea

Numerical Simulation of the Wind-Induced Current in the Caspian Sea

Contact Info

Product

Resources

About