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Numerical river modelling of turbulent flow, sediment transport and flood routing using the finite element method 1 edition

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"Several numerical and hydraulic aspects of river modelling are studied in two parts. Part I deals with the investigation of the flow characteristics in the lateral and vertical directions. The concepts and assumptions adopted in a theoretical model for the description of turbulent flow are addressed. Certain experimentally derived coefficients required by the model are investigated using the data from the UK SERC-FCF. It is followed by the implementation of a finite element computer model called RFMFEM to obtain a solution to the depth averaged momentum equation. The model can describe the lateral distributions of depth mean velocity and Reynolds shear stress, and the local boundary shear stress in channels of any cross sectional shape. Benchmarking and validation of the model is attained by comparisons with an analytical solution and experimental data. Through the lateral integration of the flow to give the discharge, the model may also predict the stage-discharge relationship. Likewise it is utilised in sediment transport analysis in open channels and comparisons with experimental data are performed. Part II addresses the study of river engineering related to the unsteady changes in the longitudinal direction. Hence the theory of flood routing is briefly discussed. Simplified models based on the diffusion analogy are adopted for one-dimensional flood routing analysis. The finite element method is applied in the formulation of a variable parameter diffusion model called RFRFEM for the solution to the non-linear convection-diffusion equation. A detailed study of the routing parameters is performed based on the accurate prediction of the rating curve. Model validation is attained through comparisons with both analytical solutions for simplified cases and systematic series of flood routing benchmark tests for inbank flow. It ultimately deals with the joint application of the turbulence and routing models to analyse overbank flood routing in natural rivers."

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Numerical river modelling of turbulent flow, sediment transport and flood routing using the finite element method
[by] Julio boris Abril Cabrera.

Published 1997 by University of Birmingham in Birmingham .
Written in English.

About the Book

Varios aspectos de la modelación numérica aplicada a la hidráulica fluvial son estudiados en dos partes. La primera parte trata sobre las características de flujo en las direcciones laterales y verticales. Se establecen los conceptos e hipótesis adoptados en un modelo teórico para la descripción del flujo turbulento. Ciertos coeficientes derivados experimentalmente requeridos por el modelo son investigados utilizando los datos experimentales del SERC-FCF del Reino Unido. Luego se aborda el desarrollo de un modelo numérico basado en elementos finitos, denominado RFMFEM, para obtener la solución de la ecuación no lineal de momentum promediado verticalmente. El modelo es capaz de describir las distribuciones laterales de la velocidad y esfuerzos cortantes de Reynolds promediados verticalmente, así como del esfuerzo cortante en el lecho, en canales abiertos de sección transversal arbitraria. La verificación y validación del modelo se logra por comparaciones con la solución analítica y datos experimentales. A través de la integración lateral del flujo para obtener el caudal, el modelo puede también predecir la curva de descarga para ríos. De igual manera se aplica el modelo en el análisis del transporte de sedimentos en canales abiertos. La segunda parte trata el estudio de la hidráulica fluvial relacionada con los cambios transitorios en la dirección longitudinal. Luego se adoptan modelos simplificados basados en la analogía de difusión para el análisis del tránsito de avenidas unidimensional. El método de los elementos finitos se aplica en la formulación de un modelo de difusión de parámetros variables denominado RFRFEM para la solución de la ecuación no lineal de convección - difusión. Se realiza un estudio detallado de los coeficientes de celeridad y atenuación utilizados por el modelo, en base de la predicción precisa de la curva de descarga con el modelo RFMFEM. La validación del modelo RFRFEM se consigue por comparaciones con la solución analítica de casos simplificados y series de verificaciones sistemáticas en casos conocidos de tránsito de crecidas en el cauce menor. Se concluye con la aplicación conjunta de los modelos de turbulencia y de difusión para analizar tránsito de avenidas en ríos naturales con flujo sobre los cauces de inundación.

First Sentence

Several numerical and hydraulic aspects of river modelling are studied in two parts. Part I deals with the investigation of the flow characteristics in the lateral and vertical directions. The concepts and assumptions adopted in a theoretical model for the description of turbulent flow are addressed. Certain experimentally derived coefficients required by the model are investigated using the data from the UK SERC-FCF. It is followed by the implementation of a finite element computer model called RFMFEM to obtain a solution to the depth averaged momentum equation. The model can describe the lateral distributions of depth mean velocity and Reynolds shear stress, and the local boundary shear stress in channels of any cross sectional shape. Benchmarking and validation of the model is attained by comparisons with an analytical solution and experimental data. Through the lateral integration of the flow to give the discharge, the model may also predict the stage-discharge relationship. Likewise it is utilised in sediment transport analysis in open channels and comparisons with experimental data are performed. Part II addresses the study of river engineering related to the unsteady changes in the longitudinal direction. Hence the theory of flood routing is briefly discussed. Simplified models based on the diffusion analogy are adopted for one-dimensional flood routing analysis. The finite element method is applied in the formulation of a variable parameter diffusion model called RFRFEM for the solution to the non-linear convection-diffusion equation. A detailed study of the routing parameters is performed based on the accurate prediction of the rating curve. Model validation is attained through comparisons with both analytical solutions for simplified cases and systematic series of flood routing benchmark tests for inbank flow. It ultimately deals with the joint application of the turbulence and routing models to analyse overbank flood routing in natural rivers.

Edition Notes

Thesis (Ph.D) - University of Birmingham, School of Civil Engineering, Faculty of Engineering.

ID Numbers

Open Library
OL17148951M

History Created December 11, 2009 · 3 revisions Download catalog record: RDF / JSON

April 28, 2010 Edited by Open Library Bot Linked existing covers to the work.
January 22, 2010 Edited by WorkBot add more information to works
December 11, 2009 Created by WorkBot add works page