Extending the Life of Reservoirs: Sustainable Sediment Management for Run-Of-River Hydropower and Dams

Extending the Life of Reservoirs: Sustainable Sediment Management for Run-Of-River Hydropower and Dams


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Extending the Life of Reservoirs: Sustainable Sediment Management for Run-Of-River Hydropower and Dams by George W. Annandale, Gregory L. Morris, Pravin Karki

Written by two of the world s leading experts on sediment management, 'Extending the Life of Reservoirs' provides guidance on adopting sediment management practices for hydropower and water supply dam projects. It explains how ensuring long-term resilience of critical infrastructure requires early and constant attention to reservoir sedimentation processes, which can reduce the storage capacity of reservoirs and damage hydro mechanical equipment. The report provides concrete guidance on safeguarding against these effects and preserving the many important services of hydropower and dam projects, including water supply, irrigation, and renewable electricity. In particular, it stresses the importance of integrating sediment management into the early planning phases of projects. 'Extending the Life of Reservoirs' is designed to assist those evaluating dam and hydropower proposals. While for the primary audience includes policy makers, lending agencies, and general practitioners, the level of detail provided in the report should appeal to a wide array of stakeholder groups. The content is neither overly technical nor overly simplistic, and aims to provide practical and useful information. Importantly, this report provides a new perspective on the importance of sediment management that is not found in prior work. It stresses the value of sediment management measures as a robust adaptation measure to support sustainable hydropower. The techniques described in the report make sense regardless of future climate changes, but in many cases have even more value when uncertainty over future hydrological patterns is taken into account."

Product Details

ISBN-13: 9781464808388
Publisher: World Bank Publications
Publication date: 10/05/2016
Pages: 190
Product dimensions: 7.00(w) x 10.00(h) x 0.40(d)

Table of Contents

Foreword xiii

About the Authors xv

Abbreviations xvii

Chapter 1 Purpose and Application of This Book Pravin Karki 1

Introduction 1

The World Bank's Role in Sustainable Infrastructure Activities 2

The Importance of Sediment Management for Ensuring the Sustainability of Reservoir and Run-of-River Projects 2

Solutions and Recommendations for Successful Sediment Management 3

Purpose, Uses, and Organization of This Book 4

Notes 5

References 5

Chapter 2 Climate Change, Sediment Management, and Sustainable Development George W. Annandale 7

Introduction 7

The Dual Nature of Reservoir Storage 9

Shifting Paradigms 10

Economic Analysis and Sustainable Development 15

Summary 20

Notes 20

References 20

Chapter 3 Overview of Sedimentation Issues George W. Annandale 23

Introduction 23

The Importance of Storage 23

Sedimentation Impacts Upstream of a Dam 26

Sedimentation Impacts Downstream of a Dam 34

Importance of Sediment Management 36

Severity of Storage Loss to Sedimentation 40

Sedimentation and Climate Change 41

Notes 42

References 43

Chapter 4 Sediment Yield George W. Annandale 45

Introduction 45

Global Sediment Yield: Spatial Variability 45

Sediment Sources 48

Measuring Sediment Yield 53

Sediment Yield Estimation 56

Note 58

References 58

Chapter 5 Patterns of Sediment Transport and Deposition George W. Annandale 61

Introduction 61

Sediment Transport in Reservoirs 61

Trap Efficiency 62

Spatial Distribution of Deposited Sediment 63

Empirical Techniques 67

Computer Simulation 73

Particle Size Distributions of Deposited Sediment 73

Temporal Aspects of Sediment Deposition 74

Note 75

References 75

Chapter 6 Sediment Monitoring Gregory L. Morris 77

Introduction 77

Sampling for Suspended Sediment Load 78

Sediment Rating Curves 82

Bed Material Load 88

Bathymetric Mapping of Sedimentation 89

Sediment Bulk Density 93

Sediment Sampling of Grain Size Distribution 95

Summary 97

References 97

Chapter 7 Sediment Management Techniques Gregory L. Morris 99

Introduction 99

Reducing Upstream Sediment Yield 99

Sediment Routing 105

Redistributing or Removing Sediment Deposits 112

Management Options and Reservoir Capacity 118

Adaptive Strategies 120

Sediment Modeling Approaches 121

References 125

Chapter 8 Sediment Management at Run-of-River Headworks Gregory L. Morris 127

Introduction 127

Configurations of ROR Hydropower Plants and Objectives of Headworks Design 128

Fluvial Morphology and Site Selection 130

Types of Intakes 133

Sediment Management at Headworks 135

Removal of Sand from Diverted Water 138

Monitoring and Sediment-Guided Operation 143

Notes 147

References 147

Chapter 9 Reservoir Sustainability Best Practices Guidance Gregory L. Morris 149

Introduction 149

Sustainable Reservoirs and Hydropower 150

Limitations of Sediment Management 153

Planning and Design Considerations 155

Monitoring Sediment Management Performance 159

End-of-Life Scenarios 160

Note 161

References 161

Appendix A Checklist for Sediment Management 163

Sediment Yield 163

Sedimentation Patterns and Impacts 165

Sustainable Sediment Management Measures 167

Development Paradigm 168

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