Fast Ice Sheet Deformation During Ice-Push and Shore Ice Ride-Up

Shapiro, L. H.; Metzner, Ronald C.; Hanson, Arnold M.; Johnson, Jerome Β.

doi:10.1016/b978-0-12-079030-2.50013-7

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…In July 1976 the fast ice was pushed a maximum of 10 m shoreward, and gouges formed in 1975 could have been extended, or short new gouges may have formed. Breakup of the ice push events, just out of radar range at the village of Barrow [Shapiro et al, 1984]. Within the radar field of view, ice motion was restricted to the outer margins of the fast ice in water depths greater than 20 m. The fast ice was stable through the winter of 1977-1978, and no ice push events occurred during the breakup in 1978.…”

Section: Origin and Preservation Of Ice Gouge Patternsmentioning

confidence: 99%

“…Maximum shoreward displacement observed during one of these events occurred in July 1975 when, as noted, multiyear floes were important fast-ice constituents. In that event, ice ridge segments at the offshore edge of the fast ice, about 1.5 km from the coast, were pushed as much as 250 m shoreward while the maximum onshore advance of ice at the beach was 15 m. The difference in ice displacement offshore at the ridge and at the beach reflects the volume of ice absorbed by ridging in the fast ice or in ice push ridges at the beach [Shapiro et al, 1984]. As discussed below, we believe that this event in July 1975 produced the most prominent of the ice gouge features observed in our study.…”

Section: Annual Variations Of the Sea Ice Covermentioning

confidence: 99%

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Correlation of nearshore ice movement with seabed ice gouges near Barrow, Alaska

Shapiro¹,

Barnes²

1991

J. Geophys. Res.

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Nearshore patterns of ice motion near Barrow, Alaska, were monitored between 1973 and 1979 with a sea ice radar system. Side scan sonar surveys of the seafloor were made at the same location during the summers of 1977 and 1978. The two data sets provide information on ice motion, ice gouging, and the rate and character of seabed deformation by ice. Four ice stages (open water, freeze‐up, winter, and breakup) can be defined on the basis of the frequency and patterns of ice motion and ice cover processes as recorded by the radar system. In all four ice stages the dominant ice motion was nearly parallel to the coast. Side scan sonar surveys show that the principal ice gouge directions nearshore were at a high angle to the coast and to the predominant direction of ice drift in both years. Gouge density was greatest in a narrow zone centered about the 10‐m isobath which reflects the distribution of deep ice keels and the pattern of reworking of the seafloor by waves and currents. We believe the majority of observed gouges were formed by keels of multiyear ice floes during an event that occurred in July 1975, 2 years before the first seabed survey. Persistence of the gouge pattern from 1975 until 1977 is attributed to persistence of the ice cover and limited reworking by waves and currents, or additional gouging. The observed decrease in gouge density between 1977 and 1978 is attributed to (1) seafloor reworking and gouge infilling by storms and (2) the absence of ice conditions that were conducive to creating fresh gouges.

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Section: Origin and Preservation Of Ice Gouge Patternsmentioning

confidence: 99%

Section: Annual Variations Of the Sea Ice Covermentioning

confidence: 99%

Correlation of nearshore ice movement with seabed ice gouges near Barrow, Alaska

Shapiro¹,

Barnes²

1991

J. Geophys. Res.

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“…This impact on the shore and the floor of the Arctic seas is driven by the ice cover dynamics and mobility, hummocking (ridging), and formation of grounded hummocks (pressure ridges) controlled by hydrometeorological factors and coastal topography [Ogorodov, 2003]. Ice scour and push can extend onto and across the beach as ice pile-up and ice ride-up [Kovacs and Sodhi, 1980;Shapiro et al, 1984;Reimnitz et al, 1990;Forbes and Taylor, 1994], while underwater ice gouging is observed in the coastal zone out to depths of 55 m or more below the sea level (much deeper in regions of iceberg grounding). In direct observations from submarines, keels of large hummock formations reaching 50 m depth have been recorded [Lisitsyn, 1994].…”

Section: Introductionmentioning

confidence: 99%

Ice Effect on Coast and Seabed in Baydaratskaya Bay, Kara Sea

Ogorodov¹,

Arkhipov²,

Kokin³

et al. 2013

Geogr. environ. sustain.

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“…A second set of studies concerns ice-push events near Point Barrow (13). In this area grounded ice ridges and floes are frequently incorporated into the ice canopy during freezeup.…”

Section: Effect Of Ice Gouges On Mukluk Islandmentioning

confidence: 99%

“…During winter ice-push events, the grounded ice moves easily shoreward across the beach fronts, gouging into many sediment types. The sediment types include consolidated sandy gravel (13) and consolidated clays (14).…”

Section: Effect Of Ice Gouges On Mukluk Islandmentioning

confidence: 99%

Estimated ice-gouge rates on a manmamde shoal in the Beaufort Sea

Newbury¹,

Adams²

OCEANS '88. 'A Partnership of Marine Interests'. Proceedings

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In 1987, slope-protection fabric was removed from the top of an artificial gravel island in Harrison Bay, southwestern Beaufort Sea.As a result, currents began to erode the island's top. After it is eroded to a subsurface shoal, ice keels will slowly gouge and disrupt the remaining shoal. This paper analyzes the ice-gouge process and estimates the rate of sediment disruption by gouges. The rate is derived from existing information on gouges in the surrounding seafloor in Harrison Bay and for a time when the shoal is at half of the water depth (-7.5 m).It is estimated that ice keels will typically disrupt 1 vertical meter of the whole surface of the shoal within a period of about 2 decades.

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Fast Ice Sheet Deformation During Ice-Push and Shore Ice Ride-Up

Cited by 6 publications

References 3 publications

Correlation of nearshore ice movement with seabed ice gouges near Barrow, Alaska

Correlation of nearshore ice movement with seabed ice gouges near Barrow, Alaska

Ice Effect on Coast and Seabed in Baydaratskaya Bay, Kara Sea

Estimated ice-gouge rates on a manmamde shoal in the Beaufort Sea

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