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• W2791327743 abstract "Transport processes in a physical model of a natural stream with a composite cross-section (compound channel) are investigated by means of a Lagrangian analysis based on nonlinear dynamical system theory. Two-dimensional free surface Eulerian experimental velocity fields of a uniform flow in a compound channel form the basis for the identification of the so-called Lagrangian Coherent Structures. Lagrangian structures are recognized as the key features that govern particle trajectories. We seek for two particular class of Lagrangian structures: Shear and shearless structures. The former are generated whenever the shear dominates the flow whereas the latter behave as jet-cores. These two type of structures are detected as ridges and trenches of the Finite-Time Lyapunov Exponents fields, respectively. Besides, shearlines computed applying the geodesic theory of transport barriers mark Shear Lagrangian Coherent Structures. So far, the detection of these structures in real experimental flows has not been deeply investigated. Indeed, the present results obtained in a wide range of the controlling parameters clearly show a different behaviour depending on the shallowness of the flow. Shear and Shearless Lagrangian Structures detected from laboratory experiments clearly appear as the flow develops in shallow conditions. The presence of these Lagrangian Structures tends to fade in deep flow conditions." @default.
• W2791327743 created "2018-03-29" @default.
• W2791327743 creator A5022501476 @default.
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• W2791327743 date "2018-03-01" @default.
• W2791327743 modified "2023-10-18" @default.
• W2791327743 title "Shear and shearless Lagrangian structures in compound channels" @default.
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• W2791327743 doi "https://doi.org/10.1016/j.advwatres.2018.01.006" @default.
• W2791327743 hasPublicationYear "2018" @default.
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