hydrophysicsФундаментальная и прикладная гидрофизикаFundamental and Applied Hydrophysics2073-66732782-5221St. Petersburg Research Center of the Russian Academy of Scienceshydrophysics-803Research ArticleГИДРОФИЗИЧЕСКИЕ И БИОГЕОХИМИЧЕСКИЕ ПОЛЯ И ПРОЦЕССЫHYDROPHYSICAL AND BIOGEOCHEMICAL FIELDS AND PROCESSESМоделирование биогеохимических процессов в донных отложениях в восточной части Финского залива с использованием диагенетической моделиModeling of Biogeochemical Processes in the Sediments of the Eastern Part of the Gulf of Finland by Means of Diagenetic ModelВолощукЕ. В.VoloshchukE. V.

г. Санкт-Петербург

Saint-Petersburg

ketrin492006@mail.ruЕреминаТ. Р.EreminaT. R.

г. Санкт-Петербург

Saint-Petersburg

РябченкоВ. А.RyabchenkoV. A.

г. Санкт-Петербург

Saint-Petersburg

Санкт-Петербургский филиал Института океанологии им. П. П. Ширшова РАН; Российский государственный гидрометеорологический университетРоссияSaint-Petersburg Department of the P. P. Shirshov Institute of Oceanology of RAS; Russian State Hydrometeorological UniversityRussian FederationРоссийский государственный гидрометеорологический университетРоссияRussian State Hydrometeorological UniversityRussian FederationСанкт-Петербургский филиал Института океанологии им. П. П. Ширшова РАНРоссияSaint-Petersburg Department of the P. P. Shirshov Institute of Oceanology of RASRussian Federation20151611202284106113Copyright © Волощук Е.В., Еремина Т.Р., Рябченко В.А., 20222022Волощук Е.В., Еремина Т.Р., Рябченко В.А.Voloshchuk E.V., Eremina T.R., Ryabchenko V.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://hydrophysics.spbrc.ru/jour/article/view/803

Для оценки биогеохимических изменений в верхнем слое донных отложений, вызванных биоирригационной активностью бентосных организмов, используется диагенетическая модель CANDI. Для условий восточной части Финского залива проведена верификация модели, показана сопоставимость модельных расчетов с данными натурных наблюдений. Исследована чувствительность модели к пористости донных отложений, выявлена зависимость глубины проникновения кислорода в донные отложения от содержания органического вещества в них. Рассчитан коэффициент биотурбации и биоирригация с учетом численности популяции бентосных организмов, оказывающих механическое воздействие на донные отложения. Результаты моделирования показывают, что постоянное воздействие биоирригации на бентосный слой уже через 5 лет может привести к уменьшению запасов фосфатов и аммония в поровой воде по сравнению со случаем отсутствия биоирригации. Запасы нитратов и сульфатов в поровой воде, наоборот, возрастут. Запасы железа твердой фазы донных отложений изменятся незначительно. Сделан вывод, что при условии отсутствия биоирригации, циклы биогенных элементов и связанных с ними растворенных химических соединений железа через 5 лет изменятся существенно, что в итоге может привести к значительным перестройкам в бентосных системах.

The paper discusses the diagenetic model CANDI (carbon and nutrient diagenesis) which was used for assessment of biogeochemical changes in the upper layer of bottom sediments caused by bioirrigation activity of benthic organisms. For the conditions of the Eastern part of the Gulf of Finland the verification of the model is made, the comparability of the model calculations with the in situ observations is showed. The sensitivity of the model to the sediment porosity is tested; the dependence of the oxygen penetration depth in the sediments from organic matter content is showed. The bioturbation coefficient is calculated taking into account the population size of benthic organisms, providing a mechanical effect on bottom sediments. The modeling results show that constant bioirrigation influence on benthic layer can lead to the reduction of phosphates and ammonium reserve in 5 years as compared to the case of bioirrigation absence. The reserve of nitrates and sulfates, contrary, will increase. The reserve of solid iron of bottom sediments will not change significantly. It is concluded that cycles of biogenic elements and their associated dissolved compounds of iron will change significantly in 5 years in case of bioirrigation absence, which can lead to significant changes in benthic systems.

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The authors declare that there are no conflicts of interest present.