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Chaos arising from the hydrological behaviour of a floodplain river during the last century
  • Federico Giri,
  • Melina Devercelli
Federico Giri
Instituto Nacional de Limnologia

Corresponding Author:[email protected]

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Melina Devercelli
Instituto Nacional de Limnologia
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The hydrological regime is the main factor governing the functioning of floodplain rivers. A full comprehension of its dynamic leads to a better understanding of the system’s behaviour and of the proper methods that must be used. We analysed the daily water level of the Paraná River during the last century at three gauge stations using linear and non-linear tools to characterise the hydrological dynamic and to analyse to what extent chaotic behaviour prevails. The three water level time series were characterised as non-linear and non-stationary by power spectrum, autocorrelation function, and surrogate test analyses. A strange attractor was developed when the phase space was reconstructed, having a low dimensional chaos supported by correlation dimension, positive maximum Lyapunov exponents, and recurrence quantification analysis. In line with this, the system resulted unpredictable with a threshold by sample entropy, and with an intermediate hydrological complexity, while Hurst exponent characterised the system as persistent and with sensitive dependence on initial conditions. In a general overview, all the evidence obtained indicates that the Paraná River’s behaviour is at the edge of chaos. A latitudinal gradient of decreasing chaoticity was observed as the floodplain extent increased, whereas complexity was highest at the intermediate river station due to the inflow of tributaries with different hydrology. This paper attempts to offer some additional insights for understanding the hydrological behaviour of floodplain rivers and the proper methods to understand their complexity.
06 Nov 2021Submitted to River Research and Applications
08 Nov 2021Submission Checks Completed
08 Nov 2021Assigned to Editor
11 Nov 2021Review(s) Completed, Editorial Evaluation Pending
12 Nov 2021Reviewer(s) Assigned
08 Jun 2022Editorial Decision: Revise Major
06 Jul 20221st Revision Received
07 Jul 2022Submission Checks Completed
07 Jul 2022Assigned to Editor
07 Jul 2022Review(s) Completed, Editorial Evaluation Pending
11 Jul 2022Reviewer(s) Assigned
14 Oct 2022Editorial Decision: Revise Minor
03 Nov 20222nd Revision Received
03 Nov 2022Submission Checks Completed
03 Nov 2022Assigned to Editor
03 Nov 2022Review(s) Completed, Editorial Evaluation Pending
07 Nov 2022Editorial Decision: Accept
08 Dec 2022Published in River Research and Applications. 10.1002/rra.4080