Detecting the chaotic nature of advection in complex river flows

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

Risultato della ricerca: Article

3 Citazioni (Scopus)

Abstract

In order to detect signatures of chaotic advection in river surface motion, surface buoys equipped with GPS were deployed in a field experiment in River Danube, Hungary. The buoys were released in the vicinity of groynes where complex mixing processes occur. 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 supplement the 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 particle tracking velocimetry (PTV).
Lingua originaleEnglish
pagine (da-a)97-106
Numero di pagine10
RivistaPERIODICA POLYTECHNICA. CIVIL ENGINEERING
Volume1
Stato di pubblicazionePublished - 2012

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Buoys
Advection
river flow
Jetties
groin
advection
Rivers
chaotic dynamics
river
Chaos theory
Velocity measurement
Global positioning system
GPS
Experiments
trajectory
Trajectories
prediction
experiment
analysis

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

Cita questo

Detecting the chaotic nature of advection in complex river flows. / Nasello, Carmelo; Napoli, Enrico; Ciraolo, Giuseppe; Józsa, János; Tél, Tamás; Gábor Szabó; Melinda Kiss, Zs; Zsugyel, Márton.

In: PERIODICA POLYTECHNICA. CIVIL ENGINEERING, Vol. 1, 2012, pag. 97-106.

Risultato della ricerca: Article

Nasello, C, Napoli, E, Ciraolo, G, Józsa, J, Tél, T, Gábor Szabó, Melinda Kiss, Z & Zsugyel, M 2012, 'Detecting the chaotic nature of advection in complex river flows', PERIODICA POLYTECHNICA. CIVIL ENGINEERING, vol. 1, pagg. 97-106.
Nasello, Carmelo ; Napoli, Enrico ; Ciraolo, Giuseppe ; Józsa, János ; Tél, Tamás ; Gábor Szabó ; Melinda Kiss, Zs ; Zsugyel, Márton. / Detecting the chaotic nature of advection in complex river flows. In: PERIODICA POLYTECHNICA. CIVIL ENGINEERING. 2012 ; Vol. 1. pagg. 97-106.
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AU - Nasello, Carmelo

AU - Napoli, Enrico

AU - Ciraolo, Giuseppe

AU - Józsa, János

AU - Tél, Tamás

AU - Gábor Szabó, null

AU - Melinda Kiss, Zs

AU - Zsugyel, Márton

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AB - In order to detect signatures of chaotic advection in river surface motion, surface buoys equipped with GPS were deployed in a field experiment in River Danube, Hungary. The buoys were released in the vicinity of groynes where complex mixing processes occur. 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 supplement the 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 particle tracking velocimetry (PTV).

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