Variational Data Assimilation in Problems of Modeling Hydrophysical Fields in Open Water Areas

Agoshkov, V. I.; Zalesny, V. B.; Sheloput, T. O.

doi:10.1134/s0001433820030020

Cited by 6 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a broader sense, domain decomposition is an indispensable approach to achieving multiscale and multiphysics simulations. A theoretical study on domain decomposition and data assimilation in the computation of a linearized version of the shallow water equations was demonstrated for Baltic Sea circulation [28,29]. In this study, assimilation data with randomness (to mimic observation data) was imposed at an open boundary of a subdomain that was linked to another subdomain.…”

Section: A Discussion Of the Collected Papersmentioning

confidence: 99%

Modeling Multiscale and Multiphysics Coastal Ocean Processes: A Discussion on Necessity, Status, and Advances

Tang

Nichols²,

Wright

et al. 2021

JMSE

View full text Add to dashboard Cite

Coastal ocean flows are interconnected by a complex suite of processes. Examples are inlet jets, river mouth effluents, ocean currents, surface gravity waves, internal waves, wave overtopping, and wave slamming on coastal structures. It has become necessary to simulate such oceanographic phenomena directly and simultaneously in many disciplines, including coastal engineering, environmental science, and marine science. Oceanographic processes exhibit distinct behaviors at specific temporal and spatial scales, and they are multiscale, multiphysics in nature; these processes are described by different sets of governing equations and are often modeled individually. In order to draw the attention of the scientific community and promote their simulations, a Special Issue of the Journal of Marine Science and Engineering entitled “Multiscale, Multiphysics Modelling of Coastal Ocean Processes: Paradigms and Approaches” was published. The papers collected in this issue cover physical phenomena, such as wind-driven flows, coastal flooding, turbidity currents, and modeling techniques such as model comparison, model coupling, parallel computation, and domain decomposition. This article outlines the needs for modeling of coastal ocean flows involving multiple physical processes at different scales, and it discusses the implications of the collected papers. Additionally, it reviews the current status and offers a roadmap with numerical methods, data collection, and artificial intelligence as future endeavors.

show abstract

Section: A Discussion Of the Collected Papersmentioning

confidence: 99%

Modeling Multiscale and Multiphysics Coastal Ocean Processes: A Discussion on Necessity, Status, and Advances

Tang

Nichols²,

Wright

et al. 2021

JMSE

View full text Add to dashboard Cite

show abstract

“…In [15], a parallel implementation of the ensemble interpolation method for assimilating observational data in a eddy-resolving model of ocean dynamics is proposed, and the results of numerical experiments in the North Atlantic when assimilating the AVISO satellite altimetry data from the Jason-1 satellite are analyzed. In [16], the algorithms for variational assimilation of temperature and level data at the liquid boundary are formulated, and the results of numerical experiments on the use of algorithms in the Baltic Sea circulation model are presented.…”

Section: Introductionmentioning

confidence: 99%

Generation of Vertical Fine Structure by the Internal Waves with the Regard for Turbulent Viscosity and Diffusion

Демышев¹,

Evstigneeva²,

Алексеев³

et al. 2021

PhO

View full text Add to dashboard Cite

Purpose. The study is aimed at evaluating effectiveness of the procedure of the observational data assimilation using the Kalman filter algorithm as compared to sequential analysis of the hydrophysical fields based on the optimal interpolation method, and at analyzing the mesoscale features of coastal circulation near the western Crimea coast and in the Sevastopol region. Methods and Results. Based on the hydrodynamic model adapted to the Black Sea coastal zone conditions including the open boundary and on the temperature and salinity data from the hydrological survey in 2007, the dynamic and energy characteristics of the Black Sea coastal circulation were calculated with high spatial resolution (horizontal grid is ~ 1.6 × 1.6 km and 30 vertical horizons). The hydrophysical fields were reconstructed using two algorithms of data assimilation: the sequential optimal interpolation and the modified Kalman filter. The kinetic energy changed mainly due to the wind action, vertical friction and the work of pressure forces; the potential energy – due to the potential energy advection and the horizontal turbulent diffusion. The following circulation features were reconstructed: the anticyclonic eddy with the radius about 15 km in the Kalamita Bay in the water upper layer, the anticyclonic eddy with the radius about 15 km between 32.2 and 32.6° E in the whole water layer, the intense current near Sevastopol and along the Crimea western coast directed to the north and northwest, and the submesoscale eddies of different signs of rotation in the upper layer. Conclusions. It is shown that having been taken into account, heterogeneity and non-isotropy of the error estimates of the temperature and salinity fields relative to the correlation function lead to qualitative and quantitative differences in the hydrodynamic fields (amplification of currents, change of the currents’ direction and eddy formations were better pronounced). At the same time, the mean square errors of the thermohaline fields’ estimates decreased. Formation of the anticyclonic eddy with the radius about 15 km in the Kalamita Bay could be related to the current shear instability. Submesoscale eddies with the diameters less than 5 km were formed when the current flowed around the coastline and the bottom topography inhomogeneities.

show abstract

Calculation of Dynamic and Energy Characteristics in the Region of Western Crimea Based on the Observational Data from Hydrological Surveys in 2007–2009 in the Numerical Model of the Black Sea Dynamics Using the Kalman Filter Algorithm

Демышев

Evstigneeva

2022

Processes in GeoMedia—Volume V

View full text Add to dashboard Cite

Variational Data Assimilation in Problems of Modeling Hydrophysical Fields in Open Water Areas

Cited by 6 publications

References 19 publications

Modeling Multiscale and Multiphysics Coastal Ocean Processes: A Discussion on Necessity, Status, and Advances

Modeling Multiscale and Multiphysics Coastal Ocean Processes: A Discussion on Necessity, Status, and Advances

Generation of Vertical Fine Structure by the Internal Waves with the Regard for Turbulent Viscosity and Diffusion

Calculation of Dynamic and Energy Characteristics in the Region of Western Crimea Based on the Observational Data from Hydrological Surveys in 2007–2009 in the Numerical Model of the Black Sea Dynamics Using the Kalman Filter Algorithm

Contact Info

Product

Resources

About