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THE VERTICAL DISTRIBUTION OF THE MAIN LIMNOLOGIC PARAMETERS, AS EVIDENCE OF RECENT LACUSTRINE SEDIMENTATION IN MATITA-MERHEI UNIT-DANUBE DELTA, ROMANIA
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I. Catianis; A. M. Constantinescu; S. Rotaru; I. Pojar; D. Grosu
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1314-2704
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English
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21
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5.1
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• Prof. DSc. Oleksandr Trofymchuk, UKRAINE
• Prof. Dr. hab. oec. Baiba Rivza, LATVIA |
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Natural processes and human influences can cause several environmental issues upon urban and rural aquatic systems, especially in deltaic environs. This study was aimed to assess the vertical variation in the physical-chemical and lithological characteristics of core sediments. 14 undisturbed short sediment cores were collected from soft lacustrine sediments in various shallow lakes situated in the Matita-Merhei interdistributary depression, Danube Delta, Romania. Sediment samples were measured for temperature, pH and electrical conductivity and assessed for their content of the total organic matter, carbonates and siliciclasts. Results did not show a wide range in the physical-chemical characteristics. The inter-comparison results related to organic matter content assumed a high productivity rate given by endogenous input. The intense in-lake biological activity points to organic carbonate accumulation within the investigated sub-environments. By contrast, the higher siliciclastic content encountered in specific sub-environments points to allochthonous sources, entering from the surrounding catchment system via streams and canals. In consequence, the concentration of organic matter and carbonates are higher in sub-environments which are not exposed to the direct action of these types of inputs. Overall, the values of limnologic parameters that were obtained from this study did not significantly vary and are typical for transitional environments (deltaic/lacustrine). The results obtained within this study represent a rough approach to understanding the complex nature of sedimentary processes. Further on, it is necessary to strength the use of other additional sedimentary records as proxy in assessing such lacustrine environments, where clogging from organic inputs is very high.
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conference
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21st International Multidisciplinary Scientific GeoConference SGEM 2021
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21st International Multidisciplinary Scientific GeoConference SGEM 2021, 16 - 22 August, 2021
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Proceedings Paper
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STEF92 Technology
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SGEM International Multidisciplinary Scientific GeoConference
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci
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297-310
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16 - 22 August, 2021
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website
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cdrom
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8172
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core sediment; Danube Delta; lacustrine environment; physical-chemical parameters; recent sedimentation
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