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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

Irina Catianis, Adriana Maria Constantinescu, Sabin Rotaru, Iulian Pojar, Dumitru Grosu

First published: 2021-12-20https://doi.org/10.5593/sgem2021/5.1/s20.071View metrics

Abstract

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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Title
THE VERTICAL DISTRIBUTION OF THE MAIN LIMNOLOGIC PARAMETERS, AS EVIDENCE OF RECENT LACUSTRINE SEDIMENTATION IN MATITA-MERHEI UNIT-DANUBE DELTA, ROMANIA
Authors
Irina Catianis, Adriana Maria Constantinescu, Sabin Rotaru, Iulian Pojar, Dumitru Grosu
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Ecology, Economics, Education and Legislation
Publisher
STEF92 Technology
Year
2021
Pages
297-310
SWS Citekey
Catianis202120579592
ISSN
1314-2704
ISBN
978-619-7603-28-6
Language
en
Publication type
Conference Paper
Keywords
core sedimentDanube Deltalacustrine environmentphysical-chemical parametersrecent sedimentation
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