The impact of floodplain hydrology on the in-stream dissolved oxygen dynamics and the relation between dissolved oxygen and water temperature are investigated. This has been done by examining the time series of dissolved oxygen and water temperature coupled with meteorological and hydrological data obtained from two lowland rivers having contrasting hydrological settings. Spectral analysis of long-term oxygen variations in a vegetated river revealed a distinct scaling regime with slope ‘–1’ indicating a self-similar behaviour. Identical slopes were obtained for water temperature and water level. The same power-law behaviour was observed for an unvegetated river at small timescales revealing the underlying scaling behaviour of dissolved oxygen regime for different types of rivers and over various time scales. The results have shown that the oxygenation of a vegetated river is strongly related to its thermal regime and flow conditions. Moreover, analysis of short-term fluctuations in the unvegetated river demonstrated that physical factors such as rainfall and backwaters play a substantial role in the functioning of this ecosystem. Finally, the results show that the relation between water temperature and dissolved oxygen concentration at the diurnal timescale exhibits a looping behaviour on the variable plot. The findings of this study provide an insight into the sensitivity of rivers to changing hydro-physical conditions and can be useful in the assessment of environmental variability.

Open Access Published: 02 December 2016 Wavelet Characteristics of Hydrological and Dissolved Oxygen Time Series in a Lowland River Agnieszka Rajwa-Kuligiewicz¹, Robert J. Bialik^1,2 & Paweł M. Rowiński¹ Acta Geophysica volume 64, pages 649–669 (2016)Cite this article 466 Accesses 10 Citations Metrics details Abstract In this study, we investigated the temporal variability of dissolved oxygen and water temperature in conjunction with water level fluctuations and river discharge in the Narew lowland river reach. For this purpose, high resolution hydrologic and water quality time series have been used. Spectral analyses of time series using continuous wavelet transform scheme have been applied in order to identify characteristic scales, its duration, and localisation in time. The results of wavelet analysis have shown a great number of periodicities in time series at the inter-annual time scale when compared to the classical Fourier analysis. 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Article Google Scholar Download references Author information Affiliations Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland Agnieszka Rajwa-Kuligiewicz, Robert J. Bialik & Paweł M. Rowiński Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, Poland Robert J. Bialik Authors Agnieszka Rajwa-Kuligiewicz View author publications You can also search for this author in PubMed Google Scholar Robert J. Bialik View author publications You can also search for this author in PubMed Google Scholar Paweł M. Rowiński View author publications You can also search for this author in PubMed Google Scholar Corresponding author Correspondence to Agnieszka Rajwa-Kuligiewicz. 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Acta Geophys. 64, 649–669 (2016). https://doi.org/10.1515/acgeo-2016-0023 Download citation Received: 13 February 2016 Revised: 28 April 2016 Accepted: 17 May 2016 Published: 02 December 2016 Issue Date: June 2016 DOI : https://doi.org/10.1515/acgeo-2016-0023 Share this article Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a shareable link is not currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing initiative Key words dissolved oxygen wavelet analysis time series lowland river