Practical Channel Hydraulics, 2nd edition

Roughness, Conveyance and Afflux

Donald W. Knight, Caroline Hazlewood, Rob Lamb, Paul G. Samuels, Koji Shiono

• Publisher: CRC Press
• Year: 2018
• ISBN:
  9781351654630
• Edition: 1
• Topic: Biological Sciences
• Subtopic: Environmental Science
• Index: Biological Sciences

Practical Channel Hydraulics is a technical guide for estimating flood water levels in rivers using the innovative software known as the Conveyance and Afflux Estimation System (CES-AES). The stand alone software is freely available at HR Wallingford's website www.river-conveyance.net. The conveyance engine has also been embedded within industry standard river modelling software such as InfoWorks RS and Flood Modeller Pro. This 2nd Edition has been greatly expanded through the addition of Chapters 6-8, which now supply the background to the Shiono and Knight Method (SKM), upon which the CES-AES is largely based.

With the need to estimate river levels more accurately, computational methods are now frequently embedded in flood risk management procedures, as for example in ISO 18320 ('Determination of the stage-discharge relationship'), in which both the SKM and CES feature. The CES-AES incorporates five main components: A Roughness Adviser, A Conveyance Generator, an Uncertainty Estimator, a Backwater Module and an Afflux Estimator. The SKM provides an alternative approach, solving the governing equation analytically or numerically using Excel, or with the short FORTRAN program provided.

Special attention is paid to calculating the distributions of boundary shear stress distributions in channels of different shape, and to appropriate formulations for resistance and drag forces, including those on trees in floodplains. Worked examples are given for flows in a wide range of channel types (size, shape, cover, sinuosity), ranging from small scale laboratory flumes ( Q = 2.0 1s-1) to European rivers (~2, 000 m3s-1), and large-scale world rivers (> 23, 000 m3s-1), a ~ 107 range in discharge. Sites from rivers in the UK, France, China, New Zealand and Ecuador are considered.

Topics are introduced initially at a simplified level, and get progressively more complex in later chapters. This book is intended for post graduate level students and practising engineers or hydrologists engaged in flood risk management, as well as those who may simply just wish to learn more about modelling flows in rivers.

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Table of Contents
• Foreword 1st Edition
• Foreword 2nd Edition
• Acknowledgements
• Notation
• Acronyms
• Glossary of terms
• 1 Introduction
• 2 Practical and theoretical issues in channel hydraulics
• 3 Understanding roughness, conveyance and afflux
• 4 Practical issues – roughness, conveyance and afflux
• 5 Further issues on flows in rivers
• 6 The Shiono & Knight Method (SKM) for analyzing open channel flows
• 7 Worked examples using the Shiono & Knight Method (SKM)
• 8 Further examples – estimating flow, level and velocity in practice
• 9 Concluding remarks
• Appendix 1 The finite element approximations for the CES equations
• Appendix 2 Summary of hydraulic equations used in the AES
• Appendix 3 Cross-section survey data
• Appendix 4 Derivation of the governing depth-averaged equation used in the SKM
• Appendix 5 Analytical solutions to the governing equation used in the SKM
• Appendix 6 Fortran program for solving the governing depth-averaged equation used in the SKM
• References
• Author index
• Subject index