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On the Rozovskii method to insolate secondary circulation from skewed flow

Mariana Inés Morell Carlos Alberto Vionnet Gerardo Perillo Luis Thomas Carlos Marcelo Gracía

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Captured 2DV patterns of river flow velocities in a cross-plane provide the basis for inferring the existence of helical flow in open-channel bends and stream confluences. Researchers usually refer to the procedure named Rozovskii, which computes the cross-stream component with respect to the mean flow direction at each vertical, forcing by definition a zero net discharge in outward and inward directions. As a consequence, the secondary flow strength is determined locally by each vertical velocity profile instead of defining it on the entire cross-section. Nevertheless, some ambiguities still arise when deciding the orientation of the cross-channel plane that defines the downstream and the cross-stream component. Rhoads and Kenworthy (1998a) assumed that the method shortcomings could be circumvented by projecting their field data onto fixed cross-sections. Their contribution ignited a controversy. It is the purpose of this thesis to contribute to the elucidation of the controversy from both analytical and experimental points of view. Two rather simple analytical flow solutions that exhibits helical behavior were developed to emulate the flow-pattern that set in curved open-channels. Then, massive field works were undertaken at river bends nearby the Santa Fe city to test the previous theoretical findings. The author establishes that despite the apparent capability of the Rozovskii procedure to extract the helicoidal component, the cross-flow has distortion by an error source term entirely attributed to the streamwise velocity. Finally, the thesis closes by proposing an engineering intervention downstream of the studied bifurcation at the entrance channel to the Santa Fe city harbor.
Palabras clave – provistas por el repositorio digital

Secondary currents; Rozovskii method; Hydrodynamic diffluence; Telemac-3d; Flow bend; Corrientes secundarias; Método de Rozovskii; Hidrodinámica en difluncias; Flujo en curvas

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Tipo de recurso:

tesis

Idiomas de la publicación

  • inglés

País de edición

Argentina

Fecha de publicación