Detecting the chaotic nature of advection in complex river flows

Giuseppe Ciraolo, Carmelo Nasello, Enrico Napoli, Gábor Szabó, Zs Melinda Kiss, Márton Zsugyel, János Józsa, Tamás Tél

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In order to detect signatures of chaotic advection in river surface motion, surface buoys equipped with GPS were deployed ina field experiment in River Danube, Hungary. The buoys were released in the vicinity of groynes where complex mixing processesoccur. A detailed analysis of the trajectories was carried out, focusing on the time evolution of the distance between buoy pairs. The analysis included the determination and comparison of local Lyapunov exponents and prediction times of finite-time hyperbolic behaviour, which is related to strong mixing. Despite of the small number of applied buoys we found evidence on Lagrangian chaos in the wake of a groyne field. In order to supplementthe field data obtained by this, inherently Lagrangian, approach, experiments in a small-scale laboratory model were also carried out, in which the Lagrangian surface dynamics was detected by following the motion of numerous floaters using particletracking velocimetry (PTV).
Original languageEnglish
Pages (from-to)97-106
Number of pages10
JournalPERIODICA POLYTECHNICA. CIVIL ENGINEERING
Volume1
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Ciraolo, G., Nasello, C., Napoli, E., Gábor Szabó, Melinda Kiss, Z., Zsugyel, M., Józsa, J., & Tél, T. (2012). Detecting the chaotic nature of advection in complex river flows. PERIODICA POLYTECHNICA. CIVIL ENGINEERING, 1, 97-106.