Detecting nonlinearity in time series driven by non-Gaussian noise: The case of river flows

F. Laio, Amilcare Michele M. Porporato, L. Ridolfi, S. Tamea

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Several methods exist for the detection of nonlinearity in univariate time series. In the present work we consider riverflow time series to infer the dynamical characteristics of the rainfall-runoff transformation. It is shown that the non-Gaussian nature of the driving force (rainfall) can distort the results of such methods, in particular when surrogate data techniques are used. Deterministic versus stochastic (DVS) plots, conditionally applied to the decay phases of the time series, are instead proved to be a suitable tool to detect nonlinearity in processes driven by non-Gaussian (Poissonian) noise. An application to daily discharges from three Italian rivers provides important clues to the presence of nonlinearity in the rainfall-runoff transformation.

Original languageEnglish (US)
Pages (from-to)463-470
Number of pages8
JournalNonlinear Processes in Geophysics
Volume11
Issue number4
DOIs
StatePublished - Jan 1 2004

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Geophysics
  • Geochemistry and Petrology

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