Ice Scours on the Exposed Bottom of the Aral Sea

Maznev, Stepan; Ogorodov, Stanislav

doi:10.5593/sgem2018/1.1/s01.024

Cited by 1 publication

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“…At the Caspian Sea this value was from 300 to 1300 AFDD [58], being greater than in the region of Lake Erie (285 to 582 AFDD, [23]). At the same time, the depth of ice impact at Lake Erie reaches 25 m [7,23], while the maximum depth of stamukha penetration in the Caspian Sea is 12 m [11] with average values of 2-5 m [29]. The values for the Aral Sea at Barsakelmes Island in its middle part reach 316-1415 AFDD [59], being close to the Caspian Sea values.…”

Section: Ice-gouging Intensity Patternsmentioning

confidence: 93%

“…The depths of ice gouging in the American Great Lakes (17-21 m, Table 3) are comparable to the Arctic Seas [23]. In the Caspian Sea, the zone of the most intense ice gouging was proved to appear in shallower water areas at depths of 2-5 m [29].…”

Section: Ice-gouging Intensity Patternsmentioning

confidence: 99%

“…However, Smerdov rejected the version that such landforms appeared by ice gouging and interpreted them as traces of divine origin or traces of aliens' activity. Detailed academic studies of ice gouging at the bottom of the Aral Sea started very recently [29]; until now, no consistent descriptions and investigations of these landforms were made. Here, we use high-resolution satellite imagery along with field surveys to characterize ice gouging landforms and reconstruct mechanisms of ice impact on the Aral Sea bottom.…”

Section: Introductionmentioning

confidence: 99%

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Ice-Gouging Topography of the Exposed Aral Sea Bed

et al. 2019

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Ice gouging, or scouring, i.e., ice impact on the seabed, is a well-studied phenomenon in high-latitude seas. In the mid-latitudes, it remains one of the major geomorphic processes in freezing seas and large lakes. Research efforts concerning its patterns, drivers and intensity are scarce, and include aerial and geophysical studies of ice scours in the Northern Caspian Sea. This study aims to explain the origin of the recently discovered linear landforms on the exposed former Aral Sea bottom using remotely sensed data. We suggest that they are relict ice gouges, analogous to the modern ice scours of the Northern Caspian, Kara and other seas and lakes, previously studied by side scan sonar (SSS) surveys. Their average dimensions, from 3 to 90 m in width and from hundreds to thousands of meters in length, and spatial distribution were derived from satellite imagery interpretation and structure from motion-processing of UAV (unmanned aerial vehicle) images. Ice scouring features are virtually omnipresent at certain seabed sections, evidencing high ice gouging intensity in mid-latitude climates. Their greatest density is observed in the central part of the former East Aral Sea. The majority of contemporary ice gouges appeared during the rapid Aral Sea level fall between 1980 and the mid-1990s. Since then, the lake has almost completely drained, providing a unique opportunity for direct studies of exposed ice gouges using both in situ and remote-sensing techniques. These data could add to our current understanding of the scales and drivers of ice impact on the bottom of shallow seas and lakes.

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Section: Ice-gouging Intensity Patternsmentioning

confidence: 93%

Section: Ice-gouging Intensity Patternsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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