Author: Quanquan Liang
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
Book Description
Longitudinal dispersivities are evaluated for two-dimensional open channel flow using a new velocity profile developed by Gomez (2006) as an alternative to the traditional "law of the wall" logarithmic profile commonly used. The modified profile improves on the logarithmic profile by incorporating a zero velocity gradient at the surface as well as a non-zero bottom slope, which is necessary for steady uniform flow. Non-dimensional forms of dispersivities are calculated based on Taylor's (1954) dispersivity equation using numerical integration with a polynomial approximation to enable integration of the indefinite integrals in that expression. While the velocities predicted by the traditional and modified profiles are relatively similar, significantly larger eddy viscosities are predicted with the new profile, and these are associated with slightly smaller longitudinal dispersivities. Flume experiments are performed to provide detailed velocity profile measurements, Reynolds stresses, and turbulent kinetic energy distributions. These data are used to compare the two profiles and to evaluate bottom shear stress and shear velocity for a range of conditions, and to provide a database for further research applications. The present results are meant to provide a stronger theoretical basis on which additional factors can be built for making final determinations of longitudinal dispersivity in the field. Further experiments are needed to directly measure longitudinal dispersivity and to confirm the present calculations.
Longitudinal Dispersion Coefficient Estimation in Two Dimensional Open Channel Flow
Author: Quanquan Liang
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
Book Description
Longitudinal dispersivities are evaluated for two-dimensional open channel flow using a new velocity profile developed by Gomez (2006) as an alternative to the traditional "law of the wall" logarithmic profile commonly used. The modified profile improves on the logarithmic profile by incorporating a zero velocity gradient at the surface as well as a non-zero bottom slope, which is necessary for steady uniform flow. Non-dimensional forms of dispersivities are calculated based on Taylor's (1954) dispersivity equation using numerical integration with a polynomial approximation to enable integration of the indefinite integrals in that expression. While the velocities predicted by the traditional and modified profiles are relatively similar, significantly larger eddy viscosities are predicted with the new profile, and these are associated with slightly smaller longitudinal dispersivities. Flume experiments are performed to provide detailed velocity profile measurements, Reynolds stresses, and turbulent kinetic energy distributions. These data are used to compare the two profiles and to evaluate bottom shear stress and shear velocity for a range of conditions, and to provide a database for further research applications. The present results are meant to provide a stronger theoretical basis on which additional factors can be built for making final determinations of longitudinal dispersivity in the field. Further experiments are needed to directly measure longitudinal dispersivity and to confirm the present calculations.
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
Book Description
Longitudinal dispersivities are evaluated for two-dimensional open channel flow using a new velocity profile developed by Gomez (2006) as an alternative to the traditional "law of the wall" logarithmic profile commonly used. The modified profile improves on the logarithmic profile by incorporating a zero velocity gradient at the surface as well as a non-zero bottom slope, which is necessary for steady uniform flow. Non-dimensional forms of dispersivities are calculated based on Taylor's (1954) dispersivity equation using numerical integration with a polynomial approximation to enable integration of the indefinite integrals in that expression. While the velocities predicted by the traditional and modified profiles are relatively similar, significantly larger eddy viscosities are predicted with the new profile, and these are associated with slightly smaller longitudinal dispersivities. Flume experiments are performed to provide detailed velocity profile measurements, Reynolds stresses, and turbulent kinetic energy distributions. These data are used to compare the two profiles and to evaluate bottom shear stress and shear velocity for a range of conditions, and to provide a database for further research applications. The present results are meant to provide a stronger theoretical basis on which additional factors can be built for making final determinations of longitudinal dispersivity in the field. Further experiments are needed to directly measure longitudinal dispersivity and to confirm the present calculations.
Hydrodynamics and Transport for Water Quality Modeling
Author: James L. Martin
Publisher: CRC Press
ISBN: 1351439871
Category : Technology & Engineering
Languages : en
Pages : 820
Book Description
Hydrodynamics and Transport for Water Quality Modeling presents a complete overview of current methods used to describe or predict transport in aquatic systems, with special emphasis on water quality modeling. The book features detailed descriptions of each method, supported by sample applications and case studies drawn from the authors' years of experience in the field. Each chapter examines a variety of modeling approaches, from simple to complex. This unique text/reference offers a wealth of information previously unavailable from a single source. The book begins with an overview of basic principles, and an introduction to the measurement and analysis of flow. The following section focuses on rivers and streams, including model complexity and data requirements, methods for estimating mixing, hydrologic routing methods, and unsteady flow modeling. The third section considers lakes and reservoirs, and discusses stratification and temperature modeling, mixing methods, reservoir routing and water balances, and dynamic modeling using one-, two-, and three-dimensional models. The book concludes with a section on estuaries, containing topics such as origins and classification, tides, mixing methods, tidally averaged estuary models, and dynamic modeling. Over 250 figures support the text. This is a valuable guide for students and practicing modelers who do not have extensive backgrounds in fluid dynamics.
Publisher: CRC Press
ISBN: 1351439871
Category : Technology & Engineering
Languages : en
Pages : 820
Book Description
Hydrodynamics and Transport for Water Quality Modeling presents a complete overview of current methods used to describe or predict transport in aquatic systems, with special emphasis on water quality modeling. The book features detailed descriptions of each method, supported by sample applications and case studies drawn from the authors' years of experience in the field. Each chapter examines a variety of modeling approaches, from simple to complex. This unique text/reference offers a wealth of information previously unavailable from a single source. The book begins with an overview of basic principles, and an introduction to the measurement and analysis of flow. The following section focuses on rivers and streams, including model complexity and data requirements, methods for estimating mixing, hydrologic routing methods, and unsteady flow modeling. The third section considers lakes and reservoirs, and discusses stratification and temperature modeling, mixing methods, reservoir routing and water balances, and dynamic modeling using one-, two-, and three-dimensional models. The book concludes with a section on estuaries, containing topics such as origins and classification, tides, mixing methods, tidally averaged estuary models, and dynamic modeling. Over 250 figures support the text. This is a valuable guide for students and practicing modelers who do not have extensive backgrounds in fluid dynamics.
Mathematical Model of the Lateral and Longitudinal Mixing Processes in Open Channels
Author:
Publisher:
ISBN:
Category : Diffusion in hydrology
Languages : en
Pages : 242
Book Description
Publisher:
ISBN:
Category : Diffusion in hydrology
Languages : en
Pages : 242
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 784
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 784
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Some Aspects of Diffusion and Dispersion in Rectangular Open Channel Flow
Author: Sergio Eiger
Publisher:
ISBN:
Category : Diffusion in hydrology
Languages : en
Pages : 448
Book Description
Publisher:
ISBN:
Category : Diffusion in hydrology
Languages : en
Pages : 448
Book Description
Environmental Hydraulics for Open Channel Flows
Author: Hubert Chanson
Publisher: Elsevier
ISBN: 0080472699
Category : Technology & Engineering
Languages : en
Pages : 485
Book Description
Environmental Hydraulics is a new text for students and professionals studying advanced topics in river and estuarine systems. The book contains the full range of subjects on open channel flows, including mixing and dispersion, Saint-Venant equations method of characteristics and interactions between flowing water and its surrondings (air entrainment, sediment transport).Following the approach of Hubert Chanson's highly successful undergraduate textbook Hydraulics of Open Channel Flow, the reader is guided step-by-step from the basic principles to more advanced practical applications. Each section of the book contains many revision exercises, problems and assignments to help the reader test their learning in practical situations.·Complete text on river and estuarine systems in a single volume·Step-by-step guide to practical applications·Many worked examples and exercises
Publisher: Elsevier
ISBN: 0080472699
Category : Technology & Engineering
Languages : en
Pages : 485
Book Description
Environmental Hydraulics is a new text for students and professionals studying advanced topics in river and estuarine systems. The book contains the full range of subjects on open channel flows, including mixing and dispersion, Saint-Venant equations method of characteristics and interactions between flowing water and its surrondings (air entrainment, sediment transport).Following the approach of Hubert Chanson's highly successful undergraduate textbook Hydraulics of Open Channel Flow, the reader is guided step-by-step from the basic principles to more advanced practical applications. Each section of the book contains many revision exercises, problems and assignments to help the reader test their learning in practical situations.·Complete text on river and estuarine systems in a single volume·Step-by-step guide to practical applications·Many worked examples and exercises
Selected Water Resources Abstracts
Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 962
Book Description
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 962
Book Description
NBS Special Publication
Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 838
Book Description
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 838
Book Description
Hydraulics of Open Channel Flow
Author: Sergio Montes
Publisher: American Society of Civil Engineers
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 720
Book Description
This book emphasizes the dynamics of the open channel flow by attempting to provide a complete framework of the basic equation of fluid motion which is used as a building block for the treatment of many practical problems. It provides up-to-date coverage of modern techniques while providing a more rigorous analytical foundation for those who require it. The structure follows a logical progression from a description and classification of open channel flows, through a development of the basic equations of motion for steady and unsteady flow, to an analysis of varied cases of flow.
Publisher: American Society of Civil Engineers
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 720
Book Description
This book emphasizes the dynamics of the open channel flow by attempting to provide a complete framework of the basic equation of fluid motion which is used as a building block for the treatment of many practical problems. It provides up-to-date coverage of modern techniques while providing a more rigorous analytical foundation for those who require it. The structure follows a logical progression from a description and classification of open channel flows, through a development of the basic equations of motion for steady and unsteady flow, to an analysis of varied cases of flow.
TID.
Author:
Publisher:
ISBN:
Category : Energy development
Languages : en
Pages : 196
Book Description
Publisher:
ISBN:
Category : Energy development
Languages : en
Pages : 196
Book Description