Ice gouging topography on the Caspian and Aral seas bottom

Ogorodov, Stanislav; Maznev, Stepan; Bukharitsin, P. I.

doi:10.31857/s0869-6071151235-50

Cited by 3 publications

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“…At the bottom of the former Aral Sea, exposed after a dramatic man-induced fall in water level, linear landforms were recently discovered [28,63]. Their analysis using remote-sensing and field (UAV and geomorphological) methods has shown that the landforms range from 3 to 90 m width (15 m on the average), from 100 m to several km length (1 km on the average) and have a depth of up to 0.5 m. Areas with their greatest density are situated in the central part of the former East Aral Sea.…”

Section: Discussionmentioning

confidence: 99%

“…In this way, the distribution of the scours in the Aral Sea and their density patterns ( Figure 16) are a result of both the varying ice-gouging intensity and the different degree of their preservation. The spatially non-uniform intensity of ice impact resulted in lower concentrations of ice scours in the coastward parts, while in the central part, there were more ice gouges, just as in Baydaratskaya Bay [4] and the Caspian Sea [63]. The largest coverage of the central part of the Eastern Aral Sea by scours In this way, the distribution of the scours in the Aral Sea and their density patterns ( Figure 16) are a result of both the varying ice-gouging intensity and the different degree of their preservation.…”

Section: Ice-gouging Intensity Patternsmentioning

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: Discussionmentioning

confidence: 99%

Section: Ice-gouging Intensity Patternsmentioning

confidence: 99%

Ice-Gouging Topography of the Exposed Aral Sea Bed

et al. 2019

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Ice Features Of The Northern Caspian Under Sea Level Fluctuations And Ice Coverage Variations

Ogorodov

Magaeva

Maznev

et al. 2020

GES

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The Caspian Seaseasonal ice cover develops each winter despite of it being in mid-latitudes. Increasing development of oil and gas fields challenges researchers to ensure operational safety. TheCaspian Seahas seen significant water level fluctuations in its recent history. And in the same time, it is vulnerable to effects of climate change. Extensive studies on ice conditions conducted in the region don’t provide insights on influence of these factors in combination to describe ice cover behavior and ice features distribution. We classify winter seasons of theNorthern Caspianby their severity calculating the cumulative freezing-degree days (CFDD). Ice charts based on aerial reconnaissance with support of the OSI-450 reanalysis provided data on the ice coverage, the timing of ice formation and destruction, the duration of the ice seasons from 1979 to 2015. We analyzed the stamukhi distribution on theNorthern Caspianfrom aerial reconnaissance for 1973–1980 and satellite imagery deciphering for 2013–2019 periods along with sea level dynamics. We found out that the amount of severe and moderate winters reduces while mild winters number increases. This leads to a decrease in the mean ice area and ice duration at theNorthern Caspian. Comparison of two periods with different sea levels and ice coverage showed that both factors affect the distribution of stamukhi by depth and distance to coast in theNorthern Caspian. Comparison of stamukhi locations in moderate winter seasons showed that their distribution is determined by the area of ice cover. In case of similar ice conditions, the stamukhi distribution is determined by sea level. The zone of their highest concentration shifts along with the coastline offset.

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Relief-Forming Role of the Ice Factor in the Coastal Area of the North-West Part of the Black Sea

Муркалов

2021

Visnyk of v. N. Karazin Kharkiv National University Series "Ecology"

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Purpose. To define the role of the ice factor in morpholithodynamics of the coastal area of the North-West part of the Black Sea. Methods. Field and in-office research was carried out in the North-West part of the Black Sea during the winter seasons of 2005-2019. The research work included geometrical leveling of the beach and the surface of shore-fast ice, drilling of the ice layer, depth sounding, sampling of deposits and of an ice core. The content of deposits in shore-fast ice was determined by weighting them after melting and evaporating a known volume of an ice core. Results. Formation of shore-fast ice, ice and hummock ride-ups, freezing of the surface of accumulative forms, congelation of fast ice with the beach surface and the bottom, freezing into ice of deposits thrown on the surface of fast ice, formation of meltwater runoff channels, melted deposit banks, melt holes had been observed. Shore-fast ice in Odesa Bay was 1.0 to 1.6 meters thick. Hummocks 0.8 to 2.3 meters high were formed. The average content of deposits in shore-fast ice in Odesa Bay was 15.7 g/m2 to 111.5 g/m2. Within the protected water area of Odesa coast protection complex, the thickness of ice was 0.5 m. Repeated measurements revealed a temporary accumulation of deposits at the depths of 1.5 to 2.0 m at the distance of 30-40 m from the water edge. The average content of deposits in shore-fast ice within the protected water area was 186.5 g/m2. The thickness of ice on the surface of beaches on the open shore was 0.2-0.5 m. Banks of sand and gravel-pebble deposits between 0.4-0.8 m and 1 m high and with the volume of 1.2-1.4 m3/m were formed on the frozen beach surface by onshore flow and storm overwash. Conclusions. In the North-West part of the Black Sea, the impact of the ice factor is characterized by rhythmic observation during severe, moderate and warm winter. Generally, it hasn’t significant impact. In somelocal points during cold winter may results in a significant alteration of the relief and deposits, and causes damage to hydraulic structures. Ice gets saturated with deposits mostly when submerging to the bottom during ebbing, when contacting the beach, being carried directly onto its surface and along cracks, and during aeolian movement. For artificial beaches of Odesa coast protection complex, the average content of deposits in ice is defined by peculiarities of formation of shore-fast ice and by hydrodynamics of the water area of these coast sections. The shapes of relief, formed under impact from the ice factor, are minor; they exist for the duration of its impact, and disappear after the storm ends.

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Ice gouging topography on the Caspian and Aral seas bottom

Cited by 3 publications

References 1 publication

Ice-Gouging Topography of the Exposed Aral Sea Bed

Ice-Gouging Topography of the Exposed Aral Sea Bed

Ice Features Of The Northern Caspian Under Sea Level Fluctuations And Ice Coverage Variations

Relief-Forming Role of the Ice Factor in the Coastal Area of the North-West Part of the Black Sea

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