Coherent structure dynamics and sediment particle motion around a cylindrical pier in developing scour holes

• Autorzy: Link O. , Gonzalez C. , Gonzalez C. , Maldonado M. , Escauriaza C.
• Języki publikacji: EN

Abstrakty

EN

Recent investigations on the dynamics of the turbulent horseshoe vortex system (THV) around cylindrical piers have shown that the rich coherent dynamics of the vortical structures is dominated by lowfrequency bimodal fluctuations of the velocity field. In spite of these advances, many questions remain regarding the changes of the flow and sediment transport dynamics as scour progresses. In this investigation we carry out laboratory experiments to register the development of the scour hole around a cylindrical pier in a fine-sand bed (d50 = 0.36 mm). We use the bathymetry measured in the experiment to simulate the flow field employing the detached-eddy simulation approach (DES), which has shown to resolve most of the turbulent stresses around surface-mounted obstacles. From these simulations we compare the dynamics of the THV to the flat-bed case, and analyze the effects on particle transport and sediment flux using the Lagrangian particle model of Escauriaza and Sotiropoulos (2011b) to study the impact of the changes of the flow on the sediment dynamics.

Słowa kluczowe

EN

bed load transport; Lagrangian model; horseshoe vortex

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2012
• Tom: Vol. 60, no. 6
• Strony: 1689--1719
• Opis fizyczny: Bibliogr. 41 poz.

Twórcy

autor

Link O.

autor

Gonzalez C.

autor

Gonzalez C.

autor

Maldonado M.

autor

Escauriaza C.

• Departamento de Ingenieria Civil, Universidad de Concepcion, Concepcion, ChileIngenieria Civil, Universidad de Concepción, Concepción, Chile,

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