Water Balance in the Sivash Bay as a Result of Variability of the Natural-Climatic and Anthropogenic Factors

Sovga, Elena; Eryemina, E. S.; Khmara, T. V.

doi:10.22449/1573-160x-2018-1-67-76

Cited by 5 publications

(3 citation statements)

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“…В настоящее время, в период климатических изменений, а также интенсивного антропогенного вмешательства, исследованием экосистемы залива Сиваш занимаются сотрудники ведущих научных учреждений Крыма. Так, изменениям в заливе факторов среды обитания водных биоценозов посвящены работы [1][2][3], непосредственно водному балансу и его составляющим, а также водообмену с Азовским морем -работы [4][5][6][7], исследованию изменений ресурсного потенциала -работы [8,9], методам оценки и системе экологического мониторинга в современных условиях -работы [10,11]. Использование современных дистанционных методов в изучении Сиваша рассматривается в работах [12,13].…”

Section: Introductionunclassified

Ecological State of the Eastern Sivash Waters in Early Summer of 2020

Borovskaya¹,

Zhugaylo²,

Krivoguz³

et al. 2021

EBPSZM

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The paper studies the ecosystem of the Eastern Sivash in the context of natural and anthropogenic influence. The data collected during the expedition of the Azov-Black Sea Branch of the FSBSI “VNIRO” conducted in early summer 2020 were used as original empirical evidence. Specific features of hydrological and hydrochemical conditions, as well as species composition, distribution, and abundance of ichthyoplankton were indicated. It was shown that the values of pH, nitrates, nitrites, and phosphates did not exceed MPCs established for fishery water bodies within the entire water area under study; the range of dissolved oxygen content was wide: 3.63–9.13 mg/dm3 . By comparison of the environmental status of the biocoenoses during early summer 2020 with the data collected during a similar survey in 2019, it was found that the water temperature at site 4 is lower by 1.9–2.7 °C. Further salinization of the Sivash was recorded: the lowest salinity in 2019 ranged within 32–38 ‰ and the highest one ranged within 83–86 ‰; in 2020, these values were 36–43 ‰ and 91–97 ‰, respectively. In terms of spatial distribution, the range of the increase in salinity was 4.36–16.69 ‰, with the highest value being recorded at site 2 (11.51–16.69 ‰) and the eastern part of site 3 (13.22 ‰). To a lesser extent (by 4.36–6.26 ‰), an increase in salinity was recorded at site 4 and the western part (5.27 ‰) of site 3. The results of plankton net surveys showed that ichthyoplankton was represented almost exclusively by larvae of big-scale send smelt, which had the densest distribution at site 1 at a salinity of 89 ‰, and on the border between sites 2 and 3 at a salinity of 74 ‰. The upper limit of salinity at which this fish reproduction is possible lies within the range 75–90 ‰. The absence of so-iuy mullet eggs and juveniles at a salinity higher than 32–36 ‰ in May – June of 2019–2020 during the peak of so-iuy mullet spawning does not provide a reason to include the Sivash Bay among the Azov Sea areas important for reproduction of this fish species

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Section: Introductionunclassified

Ecological State of the Eastern Sivash Waters in Early Summer of 2020

Borovskaya¹,

Zhugaylo²,

Krivoguz³

et al. 2021

EBPSZM

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“…It is the second type of mechanism for the hyperhaline regime formation, together with shallowness, that is characteristic of the Sivash lagoon-type bay. One of the income items of its balance until 2014 was the flow of drainage and waste water from agricultural fields in the amount of about 630 million m 3 per year [7][8], due to operation of the North Crimean Canal (NCC), built in 1971. After the NCC closure in 2014 and, as a consequence, a change in the fresh water inflow regime, a global restructuring of the ecosystem in the Sivash Bay occur.…”

Section: Introductionmentioning

confidence: 99%

Inter-Annual Variability of Water Exchange between the Azov Sea and the Sivash Bay through the Tonky Strait

Eremina¹,

Evstigneev²

2020

PhO

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Purpose. The work is aimed at studying the components’ intra- and inter-annual variability in the water exchange between the Sivash Bay and the Sea of Azov through the Tonky Strait at the current climatic period based on the empirical conversion schemes and using the hydrometeorological observation data obtained at the nearby stations. Methods and Results. Using the data on the sea level, and the wind direction and speed, the runoffs of the Azov Sea and the Sivash Bay waters in the Tonky Strait during 1966–2013 are calculated by two methods developed by Slatinsky Yu.G. in 1969 and Raskin L.G. in 1992. Predominance of the Azov currents over the Sivash ones is revealed. Seasonal and long-term dynamics of the runoff values in the strait are given based on the monthly average and annual average data. The data on the wind regime variability in the Genichesk region, and the sea level at the Genichesk meteorological station and at the Chongarsky bridge meteorological post are cited. Conclusions. The calculations show that the average annual inflow of the Azov waters through the Tonky Strait varies within the wide range 0.3 km3 – 1.18 km3, and the outflow of the Sivash waters constitutes on average 0.26 km3 per year. Difference between the water inflow and outflow in the strait is characterized by high inter-annual variability. Over the whole period under study, it amounted on average up to 0.45 km3. In the components’ spectrum of water exchange between the Sivash Bay and the Azov Sea, distinguished are the ~ 4 year fluctuations of the Sivash waters outflow from the bay, and the 3 and 5–6 year fluctuations of the Azov Sea waters inflow to the Sivash Bay. Multi-year variability of the Sivash water outflow with the 4 year periodicity is conditioned by the same precipitation amount periodicity over the Sivash Bay.

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“…Именно второй тип механизма формирования гиперхалинного режима вместе с мелководностью характерен для залива лагунного типа Сиваш. Одной из приходных статей его баланса до 2014 г. было поступление дренажносбросных вод с полей сельскохозяйственных угодий в объеме примерно 630 млн м 3 в год [7][8], обусловленное функционированием Северо-Крымского канала (СКК), построенного в 1971 г. После перекрытия СКК в 2014 г. и, как следствие, изменения режима поступления пресных вод, происходит глобальная перестройка экосистемы в Сиваше. Такая трансформация протекает на фоне естественной изменчивости основных составляющих водного баланса, одной из которых является водообмен с Азовским морем.…”

Section: Introductionunclassified

Inter-Annual Variability of Water Exchange between the Azov Sea and the Sivash Bay through the Tonky Strait

Eremina¹,

Evstigneev²

2020

MGZh

View full text Add to dashboard Cite

Purpose. The work is aimed at studying the components’ intra- and inter-annual variability in the water exchange between the Sivash Bay and the Sea of Azov through the Tonky Strait at the current climatic period based on the empirical conversion schemes and using the hydrometeorological observation data obtained at the nearby stations. Methods and Results. Using the data on the sea level, and the wind direction and speed, the runoffs of the Azov Sea and the Sivash Bay waters in the Tonky Strait during 1966–2013 are calculated by two methods developed by Slatinsky Yu.G. in 1969 and Raskin L.G. in 1992. Predominance of the Azov currents over the Sivash ones is revealed. Seasonal and long-term dynamics of the runoff values in the strait are given based on the monthly average and annual average data. The data on the wind regime variability in the Genichesk region, and the sea level at the Genichesk meteorological station and at the Chongarsky bridge meteorological post are cited. Conclusions. The calculations show that the average annual inflow of the Azov waters through the Tonky Strait varies within the wide range 0.3 km3 – 1.18 km3, and the outflow of the Sivash waters constitutes on average 0.26 km3 per year. Difference between the water inflow and outflow in the strait is characterized by high inter-annual variability. Over the whole period under study, it amounted on average up to 0.45 km3. In the components’ spectrum of water exchange between the Sivash Bay and the Azov Sea, distinguished are the ~4 year fluctuations of the Sivash waters outflow from the bay, and the 3 and 5–6 year fluctuations of the Azov Sea waters inflow to the Sivash Bay. Multi-year variability of the Sivash water outflow with the 4 year periodicity is conditioned by the same precipitation amount periodicity over the Sivash Bay.

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Water Balance in the Sivash Bay as a Result of Variability of the Natural-Climatic and Anthropogenic Factors

Cited by 5 publications

References 1 publication

Ecological State of the Eastern Sivash Waters in Early Summer of 2020

Ecological State of the Eastern Sivash Waters in Early Summer of 2020

Inter-Annual Variability of Water Exchange between the Azov Sea and the Sivash Bay through the Tonky Strait

Inter-Annual Variability of Water Exchange between the Azov Sea and the Sivash Bay through the Tonky Strait

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