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).
|Numero di pagine||10|
|Rivista||PERIODICA POLYTECHNICA. CIVIL ENGINEERING|
|Stato di pubblicazione||Published - 2012|
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Geotechnical Engineering and Engineering Geology