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Water Temperature Variability in the Lower Danube River

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The Lower Danube River

Part of the book series: Earth and Environmental Sciences Library ((EESL))

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Abstract

The chapter presents the analysis of the water temperature variability in the Lower Danube River. Temperature of water is one of the most important quality indicators for river ecosystems, which controls many physical and biogeochemical processes within the water body. All the aquatic species have the specific water temperature ranges for growth and development, thus, significant variations of water temperature may cause harmful consequences to the aquatic ecosystems. Surface waters present high variations of temperature depending on spatio-temporal variability and environmental conditions. Gradual rising of the surface waters temperature has a favorable influence on the water properties because this facilitates the natural water purification. An important influencing factor is the discharge of heated wastewaters directly in the streams, which can cause the reduction of dissolved oxygen content. In this regard, we present a time series statistical analysis of the water temperature recorded between 2001 and 2016 in three monitoring sections located on the Romanian side of the Lower Danube i.e., Pristol (RO2), Chiciu (RO4), and Reni (RO5) using monitoring data from the Transnational Monitoring Network of the Danube River (TNMN) database. Despite some differences between the monitoring sections determined by the local hydrological, climatic, and topographical conditions, a relative constancy of the water temperature was observed on the entire analyzed period. However, the obtained trendlines show that the water temperature increased from 2001 to 2016, this pattern being more evident in the southernmost control section (Chiciu-RO4). The SARIMA model provided a comprehensive description of the spatiotemporal variations of the water temperature but more complex approaches for improving water monitoring and modeling in the Lower Danube are required to integrate them in process-based analysis.

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Acknowledgements

This work was supported by a grant of the Romanian National Authority for Scientific Research, CNDI—UEFISCDI, project number PN-III-1.2-PCCDI-2017-0721 (https://inter-aspa.ro/).

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Authors and Affiliations

  1. Faculty of Environmental Engineering and Food Science, Department of Environmental Engineering, Valahia University of Târgoviște, Aleea Sinaia No. 13, 130004, Târgoviște, Romania

    Daniel Dunea

  2. Faculty of Humanities, Department of Geography, Valahia University of Târgoviște, Aleea Sinaia No. 13, 130004, Târgoviște, Romania

    Petre Brețcan

  3. Faculty of Geography, Babeș-Bolyai University, Cluj-Napoca, Romania

    Gheorghe Șerban

  4. Faculty of Humanities, Department of Geography, Valahia University of Târgoviște, Târgoviște, Romania

    Dănuț Tanislav

  5. National Administration “Romanian Waters”, Bucharest, Romania

    Elena Țuchiu

  6. Faculty of Environmental Engineering and Food Science, Department of Food Engineering, Valahia University of Târgoviște, Târgoviște, Romania

    Ștefania Iordache

Authors
  1. Daniel Dunea
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  2. Petre Brețcan
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  3. Gheorghe Șerban
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  4. Dănuț Tanislav
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  5. Elena Țuchiu
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  6. Ștefania Iordache
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Corresponding authors

Correspondence to Daniel Dunea or Petre Brețcan .

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Editors and Affiliations

  1. Faculty of Engineering, Zagazig University, Zagazig, Egypt

    Abdelazim Negm

  2. Faculty of Geography, University of Bucharest, Bucharest, Romania

    Liliana Zaharia

  3. Faculty of Geography, University of Bucharest, Bucharest, Romania

    Gabriela Ioana-Toroimac

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Dunea, D., Brețcan, P., Șerban, G., Tanislav, D., Țuchiu, E., Iordache, Ș. (2022). Water Temperature Variability in the Lower Danube River. In: Negm, A., Zaharia, L., Ioana-Toroimac, G. (eds) The Lower Danube River. Earth and Environmental Sciences Library. Springer, Cham. https://doi.org/10.1007/978-3-031-03865-5_5

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