Observations of wave dispersion and attenuation in landfast ice

Sutherland, Graig; Rabault, Jean

doi:10.1002/2015jc011446

Cited by 67 publications

(71 citation statements)

References 25 publications

(53 reference statements)

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“…The current consumption of the whole system, when logging both the IMU at 10 Hz and GPS data at 1 Hz, is 180 mA at 5 V (see Table 2). This is ∼20 times less than the overall power consumption that was needed for powering the MOXA computer-based instrument used in Sutherland and Rabault (2016).…”

Section: Referencesmentioning

confidence: 98%

“…Using microcontrollers presents several advantages over more powerful computer systems, such as the MOXA computer used in Sutherland and Rabault (2016). Price, power consumption, complexity, weight and size can be reduced, and therefore more sensors can be deployed for the same budget and can deliver longer autonomy (over 1 week of continuous measurements for an instrument weighting <5 kg) without operator intervention.…”

Section: Referencesmentioning

confidence: 99%

“…This IMU was already assessed and used to produce valuable data in the field (Sutherland and Rabault, 2016). The VN100 is configured to output magnetic vector, linear accelerations, angular rates, temperature, pressure and checksum in ASCII format at 10 Hz.…”

Section: Instrumentationmentioning

confidence: 99%

“…The interactions between ice covers and incoming waves have been studied in previous works (Weber, 1987;Squire and others, 1995;Squire, 2007;Sutherland and Rabault, 2016), and several models have been presented. Massloading models only take into account the additional inertial effects originating from the presence of the ice and predict a reduction in the wavelength, but do not account for any damping (Peters, 1950).…”

Section: Introductionmentioning

confidence: 99%

“…Ice floe fields exhibit hydrodynamic interaction with the incoming wave field as well as interaction between adjacent floes (Meylan and Squire, 1996). Continuous ice sheets interact with waves by imposing specific pressure and velocity boundary conditions at the water surface, which are related to flexural effects in the ice and lead to wave damping and modifications in the dispersion relation (Liu and MolloChristensen, 1988;Squire and others, 1995;Squire, 2007;Sutherland and Rabault, 2016). Grease ice and pancake ice accumulate and form a viscous layer that strongly attenuates surface waves (Weber, 1987;Keller, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Measurements of wave damping by a grease ice slick in Svalbard using off-the-shelf sensors and open-source electronics

et al. 2017

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ABSTRACT. Versatile instruments assembled from off-the-shelf sensors and open-source electronics are used to record wave propagation and damping measured by Inertial Motion Units (IMUs) in a grease ice slick near the shore in Adventfjorden, Svalbard. Viscous attenuation of waves due to the grease ice slick is clearly visible by comparing the IMU data recorded by the different instruments. The frequency dependent spatial damping of the waves is computed by comparing the power spectral density obtained from the different IMUs. We model wave attenuation using the one-layer model of Weber from 1987. The best-fit value for the effective viscosity is ν = (0.95 ± 0.05 × 10 −2 )m 2 s −1 , and the coefficient of determination is R 2 = 0.89. The mean absolute error and RMSE of the damping coefficient are 0.037 and 0.044m −1 , respectively. These results provide continued support for improving instrument design for recording wave propagation in ice-covered regions, which is necessary to this area of research as many authors have underlined the need for more field data.

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Section: Referencesmentioning

confidence: 98%

Section: Referencesmentioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurements of wave damping by a grease ice slick in Svalbard using off-the-shelf sensors and open-source electronics

et al. 2017

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Measurement and imaging of infragravity waves in sea ice using InSAR

Mahoney

Dammann

Johnson

et al. 2016

Geophysical Research Letters

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Using short‐temporal baseline interferometric synthetic aperture radar, we capture instantaneous images of a persistent field of infragravity waves propagating through sea ice near Barrow, Alaska, during January 2015. We estimate wave amplitudes to be between 1.2 and 1.8 mm. Curvature of wavefronts is consistent with refraction of waves entering shallow water from a source region north of Barrow. A shallow water wave model indicates that the geometry of the wavefronts is relatively insensitive to the source location, but other evidence suggests the waves may have originated in the North Atlantic, making this perhaps the longest observed propagation path for waves through ice. We also note that steepening of the waves entering shallow water can increase the peak strain by an order of magnitude, suggesting that infragravity waves may play a role in determining the location of the landfast ice edge with respect to water depth.

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