River Channel Management: Towards sustainable

This is the first book to deal comprehensively with recent revolutions in river channel management. It explores the multidisciplinary nature of such management in relation to modern management techniques that bear the background of the entire drainage basin in mind, use channel restorationwhere appropriate, and are designed to be sustainable.

Preface

ix

Acknowledgements

xi

SECTION I: INTRODUCTION

1 The Need for River Channel Management

3

(20)

1.1 River, river channel and drainage basin

3

(3)

1.2 A brief history of river use

6

(9)

1.3 River channel management

15

(1)

1.4 A multidisciplinary topic

16

(2)

1.5 Book structure

18

(1)

1.6 Key assumptions

19

(4)

SECTION II: RETROSPECT

23

(60)

2 River Channels Engineered

25

(22)

2.1 The purposes of river channel management

25

(3)

2.2 The development of hydraulic design

28

(5)

2.3 Methods of river engineering

33

(7)

Channel modification

34

(6)

River discharge modification

40

(1)

2.4 The culmination of river channel engineering

40

(2)

2.5 Reactions in the late twentieth century

42

(5)

3 River Channel Systems

47

(36)

3.1 Research on river channel systems

47

(2)

3.2 River channel system structures

49

(8)

3.3 Components and Connectivity

57

(18)

Components of the catchment hydrosystem

57

(14)

Connectivity: links between the components

71

(4)

3.4 Dynamics of channel behaviour

75

(4)

3.5 Prospect and perception of river channel systems

79

(4)

SECTION III: REALIZATION

83

(114)

4 River Channel Adjustments

85

(35)

4.1 River channel stability

85

(7)

4.2 Human impacts

92

(16)

Point and reach effects

92

(12)

Catchment impacts including land use change

104

(4)

4.3 Climate change and channel adjustment

108

(3)

4.4 The world pattern of river channel changes

111

(3)

4.5 Conceptualizing river channel adjustment

114

(3)

4.6 Implications for river channel management

117

(3)

5 River Channel Hazards: Sensitivity to Change

120

(28)

5.1 River channel hazards, assets and risk

120

(4)

5.2 River channel sensitivity to change

124

(4)

5.3 Sensitivity of undisturbed systems

128

(5)

5.4 Sensitivity and human activity

133

(10)

Location of changes

134

(2)

Likelihood and type of changes

136

(2)

Persistence of changes

138

(4)

Magnitude of changes

142

(1)

5.5 Implications for river channel management

143

(5)

6 The River Basin Planning Context

148

(24)

6.1 Development of river basin management

148

(3)

6.2 Progress towards integrated approaches

151

(10)

Defining integration

154

(6)

Content

160

(1)

6.3 Implementing integrated river basin management (IRBM)

161

(5)

6.4 The role of river channel management

166

(2)

6.5 Future approaches: implications for river channel management

168

(4)

7 A Foundation for Twenty-first Century River Channel Management

172

(25)

7.1 Retrospect and realization

172

(3)

7.2 New scientific perspectives: responding to the catchment hydrosystem challenge

175

(5)

7.3 New perceptions: environmental awareness and the concern for sustainable rivers

180

(4)

Growing environmental awareness

180

(1)

National legislation

181

(3)

International legislation

184

(1)

7.4 New approaches: reducing the legacy through river restoration

184

(6)

7.5 New methods: initiating design-with-nature

190

(4)

7.6 Requirements emerging

194

(3)

SECTION IV: REQUIREMENTS

197

(122)

8 Environmental Assessment of River Channels

199

(36)

8.1 The need to 'know your river'

199

(2)

8.2 Inventories of the channel environment

201

(11)

Catchment morphological surveys

201

(4)

Baseline habitat surveys

205

(1)

Channel classification schemes

206

(6)

8.3 Analysing the catchment historical context

212

(5)

8.4 Estimating the sensitivity of channel hazards and assets

217

(12)

Contemporary adjustment potential: hazard locations

217

(3)

Proximity to adjustment thresholds: hazard likelihood and type

220

(1)

Recovery potential: hazard persistence

221

(5)

Predicting incremental adjustment: hazard magnitude

226

(3)

8.5 Evaluating project success

229

(4)

8.6 Environmental assessment in context

233

(2)

9 Conservation-Based Management Approaches

235

(34)

9.1 New challenges for river channel management

235

(7)

9.2 Defining the goals

242

(3)

Management agency responsibilities

242

(2)

Community aspirations

244

(1)

9.3 Approaches

245

(18)

Priorities and principles

245

(6)

Non-structural approaches to preservation and natural recovery

251

(1)

Restoring flow and sediment transport processes to facilitate recovery

252

(3)

Prompting recovery to improve habitat diversity

255

(3)

Reconstructing channel morphology

258

(1)

Reinforcement to manage channel instability

259

(4)

9.4 Progress and requirements

263

(6)

10 Implementing 'Design-with-Nature'

269

(50)

10.1 Planning management actions

269

(10)

Creating the vision

270

(6)

Specifying environmental targets

276

(3)

10.2 'Working with the river'

279

(34)

Catchment and corridor measures

280

(4)

Improving network connectivity

284

(8)

Instream measures

292

(6)

Morphological reconstruction

298

(5)

Reinforcing the channel perimeter with minimum environmental impact

303

(10)

10.3 Meeting the challenges?

313

(6)

SECTION V: REVISION

319

(12)

11 Towards Sustainable Catchment Hydrosystems: Management with Nature?

321

(10)

11.1 Lessons from late twentieth-century experience

321

(1)

11.2 Prospect: rudiments of 'river channel management with nature'

322

(9)

REFERENCES

331

(54)

INDEX

385

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River Channel Management: Towards sustainable catchment hydrosystems

Summary

Table of Contents

Supplemental Materials