Assimilation Capacity of the Marine Shallow Water Ecosystems With Various Anthropogenic Impacts as the Estimation Method of Its Self-Purification Ability

Sovga, Elena; Mezentseva, I. V.; Kotelyanets, E. A.

doi:10.21513/0207-2564-2017-4-38-51

Cited by 3 publications

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“…Данные многолетнего мониторинга (1998-2011 гг.) Севастопольской бухты, ее кутовой части в зимний и осенний периоды [10,11], а также оценки уровня трофности и способности к самоочищению экосистемы отдельных акваторий бухты [16][17][18][19] показали, что максимум индекса трофности каждого района приходится на осеннезимний период, когда концентрации биогенных элементов, особенно минеральных форм азота, высоки и являются основным фактором, определяющим уровень эвтрофирования вод Севастопольской бухты. Высокие концентрации фосфатов и в особенности минеральных форм азота вносят наибольший относительный вклад в расчетную формулу индекса.…”

Section: результаты и обсужденияunclassified

Influence of the Chernaya River Runoff during High and Low Water on the Ecological State of the Apex of the Sevastopol Bay Water Area

Sovga¹,

Khmara²

2020

MGZh

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Поступила в редакцию 09.04.2019 г. Цель. Цель работыоценить климатические условия и причины формирования зимневесенних паводков на крымских реках на примере реки Черной, а также определить уровни загрязненности вод кутовой части Севастопольской бухты биогенными элементами в паводковый и меженный периоды и проанализировать общее экологическое состояние исследуемой акватории. Методы и результаты. С использованием опубликованной информации о кутовой части Севастопольской бухты и реке Черной рассмотрены гидрометеоусловия формирования зимневесеннего паводкового режима. На основании анализа экспедиционных данных Морского гидрофизического института за 2007-2017 гг. проанализированы гидрологический режим и экологическое состояние кутовой части Севастопольской бухты и устьевой зоны реки Черной. Оценен вклад зимне-весенних паводков в уровень загрязнения биогенными элементами кутовой части Севастопольской бухты. Проведено сравнение экологического состояния кутовой части бухты в период зимне-весеннего паводка в феврале 2015 г. и в период межени в сентябре 2015 г. Выводы. Показано, что распресненные воды зимне-весеннего паводка (февраль 2015 г.) повлияли на уровень поступления биогенных элементов в акваторию бухты, увеличивая содержание неорганических форм азота и силикатов. Обнаруженную закономерность необходимо учитывать при расчете ассимиляционной емкости экосистемы исследуемой акватории и при оценке ее индекса трофности. Совместный анализ экспедиционных данных Морского гидрофизического института и всей доступной информации из литературных источников позволил сделать заключение, что в последнее десятилетие в устьевой зоне реки Черной постепенно растет соленость, что может свидетельствовать о тенденции уменьшения частоты возникновения и интенсивности зимне-весенних паводков. Ключевые слова: кутовая часть Севастопольской бухты, река Черная, зимне-весенний паводок, биогенные элементы, уровень трофности. Благодарности: работа выполнена в рамках госзадания по теме № 0827-2018-0004 «Комплексные междисциплинарные исследования океанологических процессов, определяющих функционирование и эволюцию экосистем прибрежных зон Черного и Азовского морей» и частично по гранту РФФИ проект № 18-45-920002 «Самоочистительная способность экосистем акваторий Севастопольской бухты в зависимости от уровня антропогенной нагрузки».

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Section: результаты и обсужденияunclassified

Influence of the Chernaya River Runoff during High and Low Water on the Ecological State of the Apex of the Sevastopol Bay Water Area

Sovga¹,

Khmara²

2020

MGZh

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“…Due to the recreational development of Sevastopol, the presence of nature conservation facilities such as dolphinariums and mariculture development zones, there is a need to increase the requirements for compliance with sanitary standards in the region. Therefore, special attention is paid to the study of the ecological state of the Sevastopol Bay [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Pollution Transport for the Integrated Environmental Monitoring Based on the Adjoint Equations

Ryabtsev¹,

Tsyganova²

2020

PhO

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The aim of the present paper is to solve the problem of choosing the localities in the Sevastopol Bay for optimal placing the pollution sources using the adjoint equations of the admixture transfer. Methods and Results. The embankments in the city center, the Artilleriyskaya Bay and the city beach zone are chosen as the nature protection areas. Solution of the adjoint equation of the passive admixture transport yields the influence function that permits to reveal the areas on the coast, where, in case the pollution sources are placed there, the sanitary standards will be violated, and, at the existing structure of currents, these nature protection zones will suffer significant damage. To make sure that the adjoint equation is solved correctly, the direct problem can be solved for various locations of the impurity sources. Solution of the adjoint equation makes it possible to obtain information on the impurity amount in the preset nature protection zones during the preset time period at an arbitrary location of the impurity source. The currents velocities are calculated by the linear three-dimensional barotropic model for the steady wind currents. Conclusions. The numerical modeling results revealed the regions, where placing of the pollution sources would violate sanitary standards in the nature protection zones under study. The experiments showed that the north and east winds were the most dangerous. Hence industrial facilities, storm and sewage discharges having been placed at the Northern side of the Sevastopol Bay, can be extremely harmful for the ecological state of the regions under consideration. At the east and southeast winds, the industrial activity products in the Yuzhnaya Bay constitute a basic source of contamination. At the south winds, the most dangerous situation occurs in case the pollution sources are placed at the coast of the recreational zone of the city.

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Simulation of Seasonal Hydrodynamic Regime in the Sevastopol Bay and of Assessment of the Self-Purification Capacity of its Ecosystem

Sovga¹,

Mezentseva

Khmara³

2022

jour

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The numerical experiments were carried out to assess the hydrodynamic regime of the eastern part of the Sevastopol Bay, subject to the Chernaya River runoff (high- and low-water periods) and the Yuzhnaya Bay, subject to the technogenic load using the hydrothermodynamic block of the numerical three-dimensional unsteady model MECCA (Model for Estuarine and Coastal Circulation Assessment).The simulated hydrodynamic parameters of the selected parts of the Sevastopol Bay were used to analyze the self-purification capacity of their water bodies by calculating the assimilation capacity for inorganic phosphorus. Phosphates suggested as a priority pollutant in municipal and storm runoffs in the water area of the bay and a determining factor of its in the bay eutrophication. At the same time, to neutralize the differences in the water volumes of the studied water areas when calculating the self-purification ability, estimates of the specific assimilation capacity of their ecosystems were obtained.According to the simulations for the eastern apex part of the bay during high-water period, the water circulation in the surface layer contributes to the spread of pollutants throughout the entire water area of the bay. During the low-water period in the eastern part of the bay, currents prevail, directed towards the Chernaya River mouth in the surface and in the bottom water layer both in the northwestern and western wind directions. It contributes to pollutant accumulation in this part of the bay, thus reducing ability to self-purification.Possible reasons for the low self-purification capacity of the ecosystem of the eastern part of the Sevastopol Bay with respect to inorganic phosphorus are analyzed, which are associated both with the volumes of incoming Chernaya River waters during winter high- and summer low-water periods, as well as with the features of the morphometric structure of the water area bottom.For the Yuzhnaya Bay water area, the hydrodynamic regime is defined by a difficult water exchange with the main water area. Ventilation of the waters of the Yuzhnaya Bay is mainly determined by the wind regime, as a result of which the waters are either trapped in the bay or carried out of it, which undoubtedly affects the self-purification capacity of its ecosystem.

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Assimilation Capacity of the Marine Shallow Water Ecosystems With Various Anthropogenic Impacts as the Estimation Method of Its Self-Purification Ability

Cited by 3 publications

References 0 publications

Influence of the Chernaya River Runoff during High and Low Water on the Ecological State of the Apex of the Sevastopol Bay Water Area

Influence of the Chernaya River Runoff during High and Low Water on the Ecological State of the Apex of the Sevastopol Bay Water Area

Modeling of Pollution Transport for the Integrated Environmental Monitoring Based on the Adjoint Equations

Simulation of Seasonal Hydrodynamic Regime in the Sevastopol Bay and of Assessment of the Self-Purification Capacity of its Ecosystem

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