scholarly journals Laboratory study of wave-induced flexural motion of ice floes

2021 ◽  
Vol 182 ◽  
pp. 103208
Author(s):  
Hongtao Li ◽  
Ersegun Deniz Gedikli ◽  
Raed Lubbad
Keyword(s):  
Laboratory Study ◽  
Ice Floes ◽  
Wave Induced

scholarly journals Numerical Modelling of Realistic Ice Floes in Ocean Waves

1983 ◽  
Vol 4 ◽  
pp. 277-282 ◽  
Author(s):  
Vernon A. Squire
Keyword(s):  
Numerical Model ◽  
Numerical Modelling ◽  
Rigid Body ◽  
Ocean Waves ◽  
Rigid Body Motions ◽  
Ice Floes ◽  
Wave Induced

Results from a numerical model for the computation of ice-floe motions in ocean waves are presented and discussed for floes of various sectional shapes. It is shown that the beam-to-draft ratio is a crucial factor in determining the behaviour of each floe, and that ridges and keels can substantially affect the roll and sway characteristics, particularly for thick floes. Undercuts beneath floes appear to have little effect, but a protruding sill can lead to decreased motion at certain frequencies and a reduced capability for making waves. As the underwater character of an ice floe cannot easily be measured, it is necessary to infer draft from freeboard estimates using the method proposed by Ackley and others (1976). Although most of this paper is concerned with rigid body motions, a brief account is included of a modification to the model which allows each floe to bend on the passing wave. By this means, wave-induced flexure is discussed for floes of non-simple underwater shape.

scholarly journals Ice-floe kinematics in the Ross Sea marginal ice zone using GPS and accelerometers

2001 ◽  
Vol 33 ◽  
pp. 345-349 ◽  
Author(s):  
Josh Downer ◽  
Timothy G. Haskell
Keyword(s):  
Global Positioning System ◽  
Ross Sea ◽  
Austral Summer ◽  
Positioning System ◽  
Accelerometer Data ◽  
Gps Receivers ◽  
Global Positioning ◽  
Marginal Ice Zone ◽  
Ice Floes ◽  
Wave Induced

AbstractAn experiment to investigate wave-induced floe response and floe-floe interactions was conducted in the Ross Sea marginal ice zone during austral summer 1999. Three types of sensors were used: global positioning system (GPS) receivers; triaxial accelerometers; and compasses. The accelerometer data reveal consistent bands of energy centred at about 0.1 and 1.35 Hz, the latter an unexplained but common feature of such experiments. The GPS data also contain energy near 0.1 Hz, which may suggest that GPS receivers can detect the ocean-wave-induced lateral motion of ice floes.

scholarly journals A one-dimensional model for wave-induced ice-floe collisions

1991 ◽  
Vol 15 ◽  
pp. 87-95 ◽  
Author(s):  
Hayley H. Shen ◽  
Stephen F. Ackley
Keyword(s):  
Wave Amplitude ◽  
Field Studies ◽  
Added Mass ◽  
Lateral Motion ◽  
Dimensional Model ◽  
One Dimensional ◽  
Ice Floes ◽  
Wave Induced ◽  
Gravity Component ◽  
Dimensional Wave

In this study, the collision of ice floes under the action of a monotonic wave is quantified. The lateral motion of an ice floe caused by the wave is modeled as the sliding of an object under gravity. In this case, the gravity component in the direction of motion varies with time and space as the wave progresses by the floe. Drag and added mass effects are included in the model. Two floes located at different positions are shown to have a net difference in their drift (caused only be repeated wave passages). In most cases, this differential drift eventually causes floe collision. When two floes collide, a spring and dash-pot model is adopted to calculate the contact force. A one-dimensional wave passing through a one-dimensional array of disc-shaped floes is examined. Two phenomena are apparent from the analysis. First, waves have a herding effect that forms bands of floes with the width equal to the wavelength. Secondly, the frequency of collision is sensitive to the elastic properties of the floes and the wave amplitude. With sufficient values of the damping constant, which operates when two floes collide, the floes stay in contact for prolonged periods, indicating the potential to freeze together and form composite floes, as was observed in the field studies.

scholarly journals Aerial observations of sea ice break-up by ship waves

2021 ◽  
Author(s):  
Elie Dumas-Lefebvre ◽  
Dany Dumont
Keyword(s):  
Sea Ice ◽  
Flexural Rigidity ◽  
Temporal Analysis ◽  
Coast Guard ◽  
Modal Shape ◽  
Lawrence Estuary ◽  
Ship Waves ◽  
Break Up ◽  
Ice Floes ◽  
Wave Induced

Abstract. We provide the first in situ observations of floe size distributions (FSD) resulting from wave-induced sea ice break-up. In order to obtain such data, an unmanned aerial vehicle was deployed from the Canadian Coast Guard Ship Amundsen as it sailed in the vicinity of large ice floes in Baffin Bay and in the St. Lawrence Estuary, Canada. When represented as probability density functions weighted by the surface of ice floes, the FSDs exhibit a strong modal shape which confirms the preferential size hypothesis debated in the scientific community. Both FSDs are compared to a flexural rigidity length scale, which depends on ice properties, and with the wavelength scale. This comparison tends to show that the maximal distance between cracks is preferentially dictated by sea ice thickness and elasticity rather than by the wavelength. Temporal analysis of one fracture event is also done. Results show that the break-up advances almost as fast as the wave energy and that waves responsible for the break-up propagate following the mass loading dispersion relation. Moreover, our experiments show that thicker ice can attenuate wave less than thinner ice. This method thus provides key information on the wave-induced FSD, clarifies theoretical aspects from the construction of the FSD to its implementation in models and brings new knowledge regarding the temporal evolution of sea ice break-up.

Laboratory study on wave-induced setup and wave-driven current in a 2DH reef-lagoon-channel system

2020 ◽  
Vol 162 ◽  
pp. 103772 ◽  
Author(s):  
Jinhai Zheng ◽  
Yu Yao ◽  
Songgui Chen ◽  
Shubin Chen ◽  
Qiming Zhang
Keyword(s):  
Laboratory Study ◽  
Channel System ◽  
Reef Lagoon ◽  
Wave Induced

scholarly journals A one-dimensional model for wave-induced ice-floe collisions

1991 ◽  
Vol 15 ◽  
pp. 87-95 ◽  
Author(s):  
Hayley H. Shen ◽  
Stephen F. Ackley
Keyword(s):  
Wave Amplitude ◽  
Field Studies ◽  
Added Mass ◽  
Lateral Motion ◽  
Dimensional Model ◽  
One Dimensional ◽  
Ice Floes ◽  
Wave Induced ◽  
Gravity Component ◽  
Dimensional Wave

In this study, the collision of ice floes under the action of a monotonic wave is quantified. The lateral motion of an ice floe caused by the wave is modeled as the sliding of an object under gravity. In this case, the gravity component in the direction of motion varies with time and space as the wave progresses by the floe. Drag and added mass effects are included in the model. Two floes located at different positions are shown to have a net difference in their drift (caused only be repeated wave passages). In most cases, this differential drift eventually causes floe collision. When two floes collide, a spring and dash-pot model is adopted to calculate the contact force. A one-dimensional wave passing through a one-dimensional array of disc-shaped floes is examined. Two phenomena are apparent from the analysis. First, waves have a herding effect that forms bands of floes with the width equal to the wavelength. Secondly, the frequency of collision is sensitive to the elastic properties of the floes and the wave amplitude. With sufficient values of the damping constant, which operates when two floes collide, the floes stay in contact for prolonged periods, indicating the potential to freeze together and form composite floes, as was observed in the field studies.

Sign in / Sign up

Export Citation Format

Share Document