Experimental Study of High Wind Sea Surface Drag Coefficient

Репина, И. А.; Artamonov, Arseniy; Varentsov, M.I.; Kozyrev, A.V.

doi:10.22449/1573-160x-2015-1-49-58

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…A comparison of the wind direction and speed in the lower part of the ABL with wind data for this site from the literature [33,48] verifies that the observed pattern of wind distribution was quite representative for this area in the summer season. Numerical modeling of the breeze for this region [35] gives average wind speed values of about 1-2 m s −1 with SW and NE directions for the day and night breezes, respectively, at time of maximum development in the summer season.…”

Section: Discussionsupporting

confidence: 66%

Sodar Observation of the ABL Structure and Waves over the Black Sea Offshore Site

et al. 2019

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Sodar investigations of the breeze circulation and vertical structure of the atmospheric boundary layer (ABL) were carried out in the coastal zone of the Black Sea for ten days in June 2015. The measurements were preformed at a stationary oceanographic platform located 450 m from the southern coast of the Crimean Peninsula. Complex measurements of the ABL vertical structure were performed using the three-axis Doppler minisodar Latan-3m. Auxiliary measurements were provided by a temperature profiler and two automatic weather stations. During the campaign, the weather was mostly fair with a pronounced daily cycle. Characteristic features of breeze circulation in the studied area, primarily determined by the adjacent mountains, were revealed. Wave structures with amplitudes of up to 100 m were regularly observed by sodar over the sea surface. Various forms of Kelvin–Helmholtz billows, observed at the interface between the sea breeze and the return flow aloft, are described.

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Section: Discussionsupporting

confidence: 66%

Sodar Observation of the ABL Structure and Waves over the Black Sea Offshore Site

et al. 2019

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“…3, c. Here are the results of comparing the 𝐶𝐶 𝑑𝑑 (𝑉𝑉) dependences obtained by us with the data of the present paper [25], obtained during experimental work on the offshore platform in the region of the South coast of Crimea (Katsiveli village, the platform is located at 600 m from the coast), which is located in the considered Sevastopol region. The results shown in Fig.…”

Section: Results Of the Model Tuningsupporting

confidence: 51%

“…They are inherent in each individual local coastal region where predictive calculations of waves are carried out. Their description is given, for example, in [23][24][25]. They should in one way or another affect the character of the 𝐶𝐶 𝑑𝑑 (𝑉𝑉) dependence, and must be taken into account when calculating sea waves.…”

Section: Features Of the Proposed Procedures For The Swan Model Tuningmentioning

confidence: 99%

Updated System for the Sea Wave Operational Forecast of the Black Sea Marine Forecasting Center

Ratner¹,

Fomin²,

Kholod³

et al. 2021

PhO

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Purpose. The work is aimed at updating the sea wave forecasting system developed in the Black Sea Marine Forecasting Center by including the block of wind wave forecast in the Sevastopol region and by improving the wave forecast accuracy using the proposed procedure for the SWAN model tuning. Methods and Results. In the updated forecasting system, the possibility of performing the joint operational sea wave forecasts for the Black Sea and the Sevastopol region (with the 5 and 1 km spatial resolutions, respectively) became possible due to the nested grid method applied. To improve accuracy of the wave forecasts, the procedure for the SWAN model tuning was proposed. It is based on changing the parameterization of the surface friction coefficient Cd(V), where V is the surface wind speed. This permits to reduce the deviations of the forecasted wave heights from those obtained from the satellite altimetry measurements. Efficiency of the proposed procedure was assessed through comparison of the forecasting results with the remote sensing data. It is shown that in the forecasts supplied with an optimal choice of functional dependence Cd(V), the scattering index between the forecasted and measured values can be reduced by 20 %. Conclusions. Represented is the updated system of the Black Sea Marine Forecasting Center intended for the joint operational sea wave forecasts in the Black Sea and in the Sevastopol region. The results of model validation have shown that the procedure proposed for tuning the SWAN model makes it possible to reduce the deviations of the forecasted wave heights from those measured by the sensors installed at the altimetry satellites.

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“…However, the issue of using this limit in the conditions of coastal winds, though very strong, remains open. For instance, observations of atmospheric turbulence on the offshore platform in Katsiveli (Crimea) on the Black Sea coast show that even with a wind of 15 m s −1 directed from the shore, the drag coefficient exceeds 3 × 10 −3 , and with winds from the sea, the drag is much less [71]. The Monin-Obukhov similarity theory is generally not applicable when there are offshore winds because internal boundary layers form due to a sharp change in surface roughness between land and sea.…”

mentioning

confidence: 99%

Impact of the Novaya Zemlya Bora on the Ocean-Atmosphere Heat Exchange and Ocean Circulation: A Case-Study with the Coupled Model

Шестакова

Debolskiy

2022

Atmosphere

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Novaya Zemlya bora is a strong downslope windstorm in the east of the Barents Sea. This paper considers the influence of the Novaya Zemlya bora on the turbulent heat exchange between the atmosphere and the ocean and on processes in the ocean. Another goal of this study is to demonstrate the sensitivity of simulated turbulent fluxes during bora to model coupling between atmosphere, ocean and sea waves. In this regard, a high-resolution numerical simulation of one winter bora episode was carried out using the COAWST (Coupled-Ocean-Atmosphere-Wave-Sediment Transport) modeling system, which includes the atmospheric (WRF-ARW model), oceanic (ROMS model), and sea waves (SWAN model) components. As shown by the simulation results, in the fully coupled experiment, turbulent heat exchange is enhanced in comparison with the uncoupled experiment (by 3% on average over the region). This is due to the atmosphere-sea-waves interaction, and the results are highly sensitive to the choice of roughness parameterization. The influence of the interaction of the atmospheric and oceanic components on turbulent fluxes in this episode is small on average. Bora has a significant impact on the processes in the ocean directly near the coast, forming a strong coastal current and making a decisive contribution to the formation of dense waters. In the open sea, the bora, or rather, the redistribution of the wind and temperature fields caused by the orography of Novaya Zemlya, leads to a decrease in ocean heat content losses due to a decrease in turbulent heat exchange in comparison with the experiment with flat topography.

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Experimental Study of High Wind Sea Surface Drag Coefficient

Cited by 4 publications

References 28 publications

Sodar Observation of the ABL Structure and Waves over the Black Sea Offshore Site

Sodar Observation of the ABL Structure and Waves over the Black Sea Offshore Site

Updated System for the Sea Wave Operational Forecast of the Black Sea Marine Forecasting Center

Impact of the Novaya Zemlya Bora on the Ocean-Atmosphere Heat Exchange and Ocean Circulation: A Case-Study with the Coupled Model

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