Modeling of iceberg drift in the marginal ice zone of the Barents Sea

Marchenko, Aleksey; Diansky, N. A.; Фомин, В. В.

doi:10.1016/j.apor.2019.03.008

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…We observed the formation of scallops on submerged surfaces of icebergs in all experiments (2)(3)(4)(5)(6)(7)(8), where waves acted on icebergs. The sizes of the scallops in these experiments were similar.…”

Section: Discussionmentioning

confidence: 86%

“…The actual trajectories of drifting ice and icebergs in the Barents Sea have a complex shape, with numerous loops and corner points due to the combined influence of inertial forces, tidal currents, and winds [6]. Iceberg trajectories were reconstructed using geolocation data transmitted by buoys installed on icebergs [7][8][9]. Typically, the lifetime of a buoy on an iceberg in the Barents Sea does not exceed one month.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Investigations of Iceberg Melting under Wave Conditions in Sea Water

Marchenko,

Marchenko

2024

JMSE

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Changes in the masses of icebergs due to deterioration processes affect the drift of icebergs and should be taken into account when assessing iceberg risks in the areas of offshore development. In 2022 and 2023, eight laboratory experiments were carried out in the wave tank of the University Centre in Svalbard to study the melting of icebergs in sea water under calm and rough conditions. In the experiments, the water temperatures varied from 0 ℃ to 2.2 ℃. Cylindrical iceberg models were made from columnar ice cores with a diameter of 24 cm. In one experiment, the iceberg model was protected on the sides with plastic fencing to investigate the iceberg’s protection from melting when towed to deliver fresh water. The iceberg masses, water temperatures, and ice temperatures were measured in the experiments. The water velocity near the iceberg models was measured with an acoustic Doppler velocimeter. During the experiments, time-lapse cameras were used to describe the shapes and measure the vertical dimensions of the icebergs. Using experimental data, we calculated the horizontal dimensions of icebergs, latent heat fluxes, conductive heat fluxes inside the iceberg models, and turbulent heat fluxes in water as a function of time. We discovered the influence of surface waves and water mixing on the melt rates and found a significant reduction in the melt rates due to the lateral protection of the iceberg model using a plastic barrier. Based on the experimental data obtained, the ratio of the rates of lateral and bottom melting of the icebergs and lateral melting of the icebergs under wave conditions was parametrized depending on the wave frequency.

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Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Laboratory Investigations of Iceberg Melting under Wave Conditions in Sea Water

Marchenko,

Marchenko

2024

JMSE

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“…The subsurface iceberg shape can be obtained with ground-penetrating radar ( 55 ) or with sonar placed on autonomous submarines ( 56 ). Then, by subtracting off the contributions of wind, currents, waves, and Coriolis force ( 25 , 26 , 57 , 58 ), it may be possible to ascertain the importance of gravity-current driven propulsion by correlating them to rapidly melting icebergs with a statistically significant number of measurements. This would establish that contribution of ice melting on its drift may be not negligible, for a typical asymmetrical iceberg with inclined immersed walls.…”

Section: Discussionmentioning

confidence: 99%

Dissolution-driven propulsion of floating solids

Chaigne,

Berhanu,

Kudrolli

2023

Proc. Natl. Acad. Sci. U.S.A.

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We show that unconstrained asymmetric dissolving solids floating in a fluid can move rectilinearly as a result of attached density currents which occur along their inclined surfaces. Solids in the form of boats composed of centimeter-scale sugar and salt slabs attached to a buoy are observed to move rapidly in water with speeds up to 5 mm/s determined by the inclination angle and orientation of the dissolving surfaces. While symmetric boats drift slowly, asymmetric boats are observed to accelerate rapidly along a line before reaching a terminal velocity when their drag matches the thrust generated by dissolution. By visualizing the flow around the body, we show that the boat velocity is always directed opposite to the horizontal component of the density current. We derive the thrust acting on the body from its measured kinematics and show that the propulsion mechanism is consistent with the unbalanced momentum generated by the attached density current. We obtain an analytical formula for the body speed depending on geometry and material properties and show that it captures the observed trends reasonably. Our analysis shows that the gravity current sets the scale of the body speed consistent with our observations, and we estimate that speeds can grow slowly as the cube root of the length of the inclined dissolving surface. The dynamics of dissolving solids demonstrated here applies equally well to solids undergoing phase change and may enhance the drift of melting icebergs, besides unraveling a primal strategy by which to achieve locomotion in active matter.

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“…where u * is the turbulent velocity scale, and Φ T ≈ 200 is the Stanton number [36]. From Formula (12), it follows that us(T sw − T ur ) = 1 only when Q w ≥ 0.…”

Section: Model Equationsmentioning

confidence: 99%

Modeling of Thermodynamic Consolidation of Sea Ice Ridges Drifting in the Water with Changing Temperature

Marchenko¹

2022

JMSE

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Oceanographic and ice conditions in the region of Spitsbergen Bank in the Barents Sea were investigated in research cruises of the “Polarsyssel” in 2017–2019. Trajectories of ice drift were constructed using GPS data of the buoys deployed on the floes in the research cruises. The duration of the ice season in the region was analyzed using ice charts. The air temperature and wind velocities were analyzed using the data of meteorological stations on Bear Island and Hopen Island. Fieldwork on drifting ice showed the existence of thick consolidated floes with drafts up to 8 m, which were identified as completely consolidated sea ice ridges. The presence of such floes is dangerous for winter navigation along Spitsbergen Bank. A model of thermodynamic consolidation of ice ridges was formulated to investigate the thermodynamic evolution of ice ridges. The observed air and sea water temperatures were used in the boundary conditions on top and bottom surfaces of sea ice rubble. It was shown that the regular interaction of sea ice rubble with Atlantic and Arctic waters in the region of Spitsbergen Bank leads to almost complete consolidation of the ice rubble with an initial macro-porosity 0.2 for 150 days.

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Modeling of iceberg drift in the marginal ice zone of the Barents Sea

Cited by 8 publications

References 20 publications

Laboratory Investigations of Iceberg Melting under Wave Conditions in Sea Water

Laboratory Investigations of Iceberg Melting under Wave Conditions in Sea Water

Dissolution-driven propulsion of floating solids

Modeling of Thermodynamic Consolidation of Sea Ice Ridges Drifting in the Water with Changing Temperature

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