Hydraulics of Stepped Spillways : Proceedings of the International Workshop on Hydraulics of Stepped Spillways, Zurich, Switzerland, 22-24 March 2000

This book provides a discussion of the latest research pertaining to the hydraulic design of spilways and to hydraulic engineering in general. It comprises the papers of a workshop organized to bring together engineers and scientists from around the world for the exchange of ideas on water flow over stepped spillways. This workshop covered a range of subjects from two-phase flow characteristics to refurbishment and implementation of spillways in existing dam structures, and the book also includes a number of illustrative case studies. Overall, this book is one of the first in the rapidly growing field of modern hydraulic engineering techniques. It will interest designers, scientists, and graduate students and researchers in the fields of hydraulic, civil and environmental engineering. Cover 1 Half Title 2 Title Page 4 Copyright Page 5 Table of Contents 6 Preface 10 Organization 12 Sponsors 14 Introductory lecture 16 Spillways for high velocities 18 Case studies 26 Field testing of Brushes Clough stepped block spillway 28 The stepped spillway for the Mhlathuzane dam, Swaziland 36 Hydraulic design of Nakasujigawa dam stepped spillway 42 Ashton stepped spillway - Design and construction 50 Aeration characteristics and cavitation risk 58 Stepped spillways, a dissolved gas abatement alternative 60 Scale effects in modelling two-phase stepped spillway flow 68 Air inception in skimming flow regime over stepped spillways 76 Air entrainment and safety against cavitation damage in stepped spillways over RCC dams 84 Air-water flow and gas transfer at aeration cascades: A comparative study of smooth and stepped chutes 92 Energy dissipation 100 Stepped spillway studies at CEDEX 102 Flow resistance in skimming flow: A critical review 110 Dissipation efficiency of stepped spillways 118 Energy dissipation comparison among stepped channel, drop and ramp structures 126 Nappe flow in stepped channels - Occurrence and energy dissipation 134 Internal flow features 142 Backwater and drawdown curves in stepped spillway flow 144 Pressure field in skimming flow over a stepped spillway 152 Characteristics of plunging flows in stepped channel chutes 162 Design 168 The CIRIA guide for the design of stepped-block spillways 170 Guidelines for the hydraulic design of stepped spillways 178 Roller compacted concrete and stepped spillways 186 Design of concrete stepped overlay protection for embankment dams 194 Hydraulic design of stepped spillways over RCC dams 202 Design of stepped spillway for skimming flow regime 210 Author index 216 Cover......Page 1 Half Title......Page 2 Title Page......Page 4 Copyright Page......Page 5 Table of Contents......Page 6 Preface......Page 10 Organization......Page 12 Sponsors......Page 14 Introductory lecture......Page 16 Spillways for high velocities......Page 18 Case studies......Page 26 Field testing of Brushes Clough stepped block spillway......Page 28 The stepped spillway for the Mhlathuzane dam, Swaziland......Page 36 Hydraulic design of Nakasujigawa dam stepped spillway......Page 42 Ashton stepped spillway - Design and construction......Page 50 Aeration characteristics and cavitation risk......Page 58 Stepped spillways, a dissolved gas abatement alternative......Page 60 Scale effects in modelling two-phase stepped spillway flow......Page 68 Air inception in skimming flow regime over stepped spillways......Page 76 Air entrainment and safety against cavitation damage in stepped spillways over RCC dams......Page 84 Air-water flow and gas transfer at aeration cascades: A comparative study of smooth and stepped chutes......Page 92 Energy dissipation......Page 100 Stepped spillway studies at CEDEX......Page 102 Flow resistance in skimming flow: A critical review......Page 110 Dissipation efficiency of stepped spillways......Page 118 Energy dissipation comparison among stepped channel, drop and ramp structures......Page 126 Nappe flow in stepped channels - Occurrence and energy dissipation......Page 134 Internal flow features......Page 142 Backwater and drawdown curves in stepped spillway flow......Page 144 Pressure field in skimming flow over a stepped spillway......Page 152 Characteristics of plunging flows in stepped channel chutes......Page 162 Design......Page 168 The CIRIA guide for the design of stepped-block spillways......Page 170 Guidelines for the hydraulic design of stepped spillways......Page 178 Roller compacted concrete and stepped spillways......Page 186 Design of concrete stepped overlay protection for embankment dams......Page 194 Hydraulic design of stepped spillways over RCC dams......Page 202 Design of stepped spillway for skimming flow regime......Page 210 Author index......Page 216 Spillways for high heads and consequently for high velocities have suffered from severe cavitation damage.