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Standing waves during ice breakup in a polar lake
Citation
Kirillin, G and Engelhardt, C and Forrest, A and Graves, K and Laval, B and Lepparanta, M and Rizk, W, Standing waves during ice breakup in a polar lake, Proceedings of the 22nd IAHR International Symposium on ICE, 11-15 August 2014, Singapore, pp. 467-470. ISBN 978-981-09-0750-1 (2014) [Refereed Conference Paper]
Copyright Statement
Copyright 2014 IAHR-ICE Organisers.
Official URL: http://www.iahr-ice2014.org/
Abstract
Strong wind events play a crucial role in breaking the seasonal ice sheet in lakes and marginal seas. Still, the mechanism of ice break-up is poorly investigated. We demonstrate that, apart from the obvious effect of horizontal drift, wind produces basin-scale standing waves (seiches) under ice, which, in turn, may essentially contribute to breaking the ice sheet and accelerate ice melting. An extensive dataset on lake physical properties during the ice
breakup has been aquired in spring 2013 in polar Lake Kilpisjarvi, Finland. The high-resolution records of pressure, current velocities and water temperature revealed continuous oscillatory motions with periods of 10 to 25 min. The spectral energy peaks resided on frequencies corresponding to the first three eigenfrequencies of the lake indicating the oscillations are produced by the seiche movements at t he lake surface. In agreement with previous studies, seiches persis1ed under ice cover. During the period preceding the breakup, amplitudes of the lake surface oscilations under ice did not exceeded lmm. The ice breakup was associated with a strong wind event and a 10 times increase of seiche amplitudes under ice. We suggest that vertical motions of the soft ice sheet significantly accelerated its melting, so that at the lake surface covered by ice to 80 per cent, the ice completely melted within 10-15 hours.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | standing waves, ice-breakup, ice covered lakes, polar lakes |
Research Division: | Engineering |
Research Group: | Fluid mechanics and thermal engineering |
Research Field: | Geophysical and environmental fluid flows |
Objective Division: | Environmental Management |
Objective Group: | Other environmental management |
Objective Field: | Other environmental management not elsewhere classified |
UTAS Author: | Forrest, A (Dr Alexander Forrest) |
ID Code: | 94130 |
Year Published: | 2014 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2014-08-30 |
Last Modified: | 2018-03-19 |
Downloads: | 0 |
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