Expeditionary studies in the western basin of the Aral Sea in September 2006

Zav’yalov, P. O.; Andrulionis, E. E.; Арашкевич, Е. Г.; Grabovskii, A. B.; Dikarev, S. N.; Kudyshkin, T. V.; Kurbaniyazov, A. K.; Ni, Anatoli; Сапожников, Ф. В.

doi:10.1134/s0001437008040152

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…The field data analyzed to support the numerical simulations were recorded during two field campaigns (27-30 September 2006 and 29 October-3 November 2013) described in detail by Zavialov et al (2008) and Izhitskiy et al (2014b), respectively. Figure 1 presents the shorelines of the South Aral in 2006 and 2013 together with the bathymetric levels for 2013, when the sea surface level decreased by 3.2 m. The shoreline has mainly receded along the eastern shore, where the lake is shallower.…”

Section: Site and Measurementsmentioning

confidence: 99%

The internal seiche field in the changing South Aral Sea (2006–2013)

Roget

Khimchenko

Forcat

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Internal standing waves (seiches) in the South Aral Sea are studied for the first time. The study, based on numerical simulations and field data, focuses on two different campaigns: the first in autumn 2006, when the stratification was weak and there was a mild prevailing northeasterly wind, and the second in autumn 2013, when the stratification was strong and there was a mild easterly wind. Between these two campaigns, the sea surface level decreased by 3.2 m. The periods of the fundamental modes were identified as 36 and 14 h, respectively. In both years, either second or third vertical modes were found. In general, the vertical modes in 2013 were higher because of the broad and strong pycnocline. For both years, it was found that the deep quasi-homogeneous mixed upper layer could sustain internal waves under mild wind conditions. The observed first and second vertical modes in 2006 are the first and second horizontal modes and the second and third vertical modes in 2013 are the second and third horizontal modes. The results suggest that, due to sea level variations, the neck connecting the Chernyshev Bay to the main body of the lake can become a critical location for the development of a nodal line for all principal oscillation modes. Rotation effects on waves were not analyzed in this study.

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Section: Site and Measurementsmentioning

confidence: 99%

The internal seiche field in the changing South Aral Sea (2006–2013)

Roget

Khimchenko

Forcat

et al. 2017

Hydrol. Earth Syst. Sci.

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show abstract

“…The increase in the salinity of the Aral Sea waters led to further changes in its ion-salt composition. The proportion of divalent ions decreased due to the sequential precipitation of calcium carbonate, magnesium carbonate, gypsum, mirabilite, and halite (Bortnik and Chistyayeva 1990 ; Zavialov et al 2012 ).…”

Section: Changes In Water Level and Chemistry Of The Aral Seamentioning

confidence: 99%

“…Salinity of the deep-water Western basin exceeded 100‰. The Eastern basin became a shallow water body and its salinity could now exceed as much as 200‰ (Aladin and Plotnikov 2008 ; Zavialov et al 2012 ).…”

Section: Changes In Water Level and Chemistry Of The Aral Seamentioning

confidence: 99%

The zoocenosis of the Aral Sea: six decades of fast-paced change

Аладин

Gontar

Жакова

et al. 2018

Environ Sci Pollut Res

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During the last six decades, the water level of the Aral Sea, once one of the largest lakes in the world, has experienced a major human-driven regression followed by significant changes in salinity. These fast-paced alterations were initiated by the diversion of two rivers—the Amu Darya and Syr Darya—key players in the regulation of the water balance of the Aral Sea. Consequently, biological modifications took place leading to severe changes of the zoocenosis. This paper reviews the changes that have affected communities of fish and aquatic invertebrates in the Aral Sea since the 1950s. The reported alterations in biodiversity not only represent a natural response to a decrease in water level and a subsequent increase in salinity but also effects of non-native species introduction. The future prospects for invertebrates and fish in the Aral Sea, assuming that initiated restoration work is continued, are also discussed in this paper.

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Section: Site and Measurementsmentioning

confidence: 99%

The internal seiche field in the changing South Aral Sea (2006–2013)

Roget¹,

Khimchenko²,

Forcat³

et al. 2016

Preprint

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Abstract. Internal standing waves (seiches) in the South Aral Sea are studied for the first time. The study, based on numerical simulations and field data and, focuses on two different campaigns: the first in autumn 2006, when the stratification was weak, and the second in autumn 2013, when it was strong. During this time, the sea surface level decreased 3.2 m but differences in stratification depend only on the time when the campaigns were carried out because the maximum density gradient decreases even though the sea continues to become saltier. In 2006 there was a mild prevailing northeasterly wind and in 2013 a mild easterly wind. The fundamental modes were identified as 36 h and 14 h, respectively. For both years we focused on the sub-inertial modes which were found to be either second or third vertical modes. In general, the vertical modes in 2013 are higher because of the strong stratification. For both years, it was found that the quasi homogeneous mixed deep upper layer could sustain internal waves under mild wind conditions. Regarding the horizontal structure, in 2006 they are first and second modes and in 2013 second and third horizontal modes. The results suggest that, due to sea level variations, the neck connecting the Chernyshev Bay to the main body of the lake can become critical for the development a nodal line in that neck.

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Expeditionary studies in the western basin of the Aral Sea in September 2006

Cited by 4 publications

References 3 publications

The internal seiche field in the changing South Aral Sea (2006–2013)

The internal seiche field in the changing South Aral Sea (2006–2013)

The zoocenosis of the Aral Sea: six decades of fast-paced change

The internal seiche field in the changing South Aral Sea (2006–2013)

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