Introducing Large Rivers

Introducing Large Rivers
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An accessible introduction to large rivers, including coverage of the geomorphology, hydrology, ecology, and environments of large river systems This indispensible book takes a structured and global approach to the subject of large rivers, covering geomorphology, hydrology, ecology, and anthropogenic environment. It offers a thorough foundation for readers who are new to the field and presents enlightening discussions about issues of management at the worldwide scale. The book also examines possible future adaptations that may come about due to climate change. The book has benefitted from contributions by Professor W.J. Junk on the ecology of floodplains and Professor Olav Slaymaker on the large arctic rivers. Introducing Large Rivers is presented in three parts. Part 1 provides an introduction to the world’s large rivers and their basins. It covers source, transfer, and storage of their water and sediment; Pleistocene inheritance; the ecology of channels and floodplains; deltas; and more. Several large rivers are discussed in the next part. These include the Amazon Mississippi, Nile, Ganga-Brahmaputra System, Mekong, and Yangtze. The last part examines changes in large rivers and our management of river systems. It studies anthropogenic alterations such as land use and deforestation in large river basins; structural control systems like dams and reservoirs on channels; and ecological changes. It finishes with chapters on the management of large rivers, covering both technical and political aspects, and the future of the world’s big river systems.  Introducing Large Rivers is ideal as an introductory textbook on large rivers for future earth and environmental scientists and river managers. It will also benefit advanced undergraduate and graduate students studying geography, geology, ecology, and river management.

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Avijit Gupta. Introducing Large Rivers

Table of Contents

List of Tables

List of Illustrations

Guide

Pages

Introducing Large Rivers

Preface

Note

1 Introduction. 1.1 Large Rivers

1.2 A Book on Large Rivers

References

2 Geological Framework of Large Rivers. 2.1 Introduction

2.2 The Geological Framework: Elevated Land and a Large Catchment

2.3 Smaller Tectonic Movements

2.4 The Subsurface Alluvial Fill of Large Rivers

2.5 Geological History of Large Rivers

2.6 Conclusion

Questions

References

3 Water and Sediment in Large Rivers. 3.1 Introduction

3.2 Discharge of large Rivers

3.3 Global Pattern of Precipitation

3.4 Large River Discharge: Annual Pattern and Long-Term Variability

3.5 Sediment in Large Rivers

3.6 Conclusion

Questions

References

4 Morphology of Large Rivers. 4.1 Introduction

4.2 Large Rivers from Source to Sink

Box 4.1 Rivers on Alluvial Fans

4.3 The Amazon River

4.3.1 The Setting

4.3.2 Hydrology

4.3.3 Sediment Load

4.3.4 Morphology

4.4 The Ganga River. 4.4.1 The Setting

4.4.2 Hydrology

4.4.3 Sediment Load

4.4.4 Morphology

4.5 Morphology of Large Rivers: Commonality and Variations

4.6 Conclusion

Questions

References

5 Large Rivers and their Floodplains: Structures, Functions, Evolutionary Traits and Management with Special Reference to the Brazilian Rivers

5.1 Introduction

5.2 Origin and Age of Rivers and Floodplains

5.3 Scientific Concepts and their Implications for Rivers and Floodplains

5.4 Water Chemistry and Hydrology of Major Brazilian Rivers and their Floodplains

5.5 Ecological Characterisation of Floodplains and their Macrohabitats

5.6 Ecological Responses of Organisms to Flood-Pulsing Conditions

5.6.1 Trees

5.6.2 Herbaceous Plants

5.6.3 Invertebrates

5.6.4 Fish

5.6.5 Other Vertebrates

5.7 Biodiversity

5.7.1 Higher Vegetation

5.7.2 Animal Biodiversity

5.8 The Role of Rivers and their Floodplains for Speciation and Species Distribution of Trees

5.9 Biogeochemical Cycles in Floodplains

5.9.1 Biomass and Net Primary Production

5.9.1.1 Algae

5.9.1.2 Herbaceous Plants

5.9.1.3 Trees of the Flooded Forest

5.9.2 Decomposition

5.9.3 The Nitrogen Cycle

5.9.4 Nutrient Transfer Between the Terrestrial and Aquatic Phases

5.9.5 Food Webs

5.10 Management of Amazonian River Floodplains. 5.10.1 Amazonian River Floodplains

5.10.2 Savanna Floodplains

5.11 Policies in Brazilian Wetlands

5.12 Discussion and Conclusion

Acknowledgements

References

Notes

6 Large River Deltas. 6.1 Introduction

6.2 Large River Deltas: The Distribution

6.3 Formation of Deltas

6.4 Delta Morphology and Sediment

6.5 The Ganga-Brahmaputra Delta: An Example of a Major Deltaic Accumulation

6.5.1 The Background

6.5.2 Morphology of the Delta

6.5.3 Late Glacial and Holocene Evolution of the Delta

6.6 Conclusion

Questions

References

7 Geological History of Large River Systems. 7.1 The Age of Large Rivers

7.2 Rivers in the Quaternary

7.2.1 The Time Period

7.2.2 The Nature of Geomorphic Changes

7.2.3 The Pleistocene and Large Rivers

7.2.3.1 The Glacial Stage

7.2.3.2 The Transition

7.2.3.3 The Interglacial Stage

7.3 Changes During the Holocene

7.4 Evolution and Development of the Mississippi River

7.5 The Ganga-Brahmaputra System

7.6 Evolution of the Current Amazon

7.7 Evolutionary Adjustment of Large Rivers

Questions

References

8 Anthropogenic Alterations of Large Rivers and Drainage Basins. 8.1 Introduction

8.2 Early History of Anthropogenic Alterations

8.3 The Mississippi River: Modifications before Big Dams

8.4 The Arrival of Large Dams

Box 8.1 Aswan High Dam on the Nile River

8.5 Evaluating the Impact of Anthropogenic Changes

8.5.1 Land Use and Land Cover Changes

8.5.2 Channel Impoundments

8.6 Effect of Impoundments on Alluvial Rivers

8.7 Effect of Impoundments on Rivers in Rock

Box 8.2 The Three Gorges Dam on the Changjiang

8.8 Large-scale Transfer of River Water

8.9 Conclusion

Questions

References

9 Management of Large Rivers. 9.1 Introduction

Box 9.1 Sustainable Development

Box 9.2 Environmental Impact Assessment

9.2 Biophysical Management

9.3 Social and Political Management

9.3.1 Values and Objectives in River Management

9.3.2 International Basin Arrangements

9.4 The Importance of the Channel, Floodplain, and Drainage Basin

9.5 Integrated Water Resources Management

9.6 Techniques for Managing Large River Basins

9.7 Administering the Nile

Box 9.3 Problems and Management of the Mekong River Basin

9.8 Conclusion

Questions

References

10 The Mekong: A Case Study on Morphology and Management. 10.1 Introduction

10.2 Physical Characteristics of the Mekong Basin. 10.2.1 Geology and Landforms

10.2.2 Hydrology

10.2.3 Land Use

10.3 The Mekong: Source to Sea. 10.3.1 The Upper Mekong in China

10.3.2 The Lower Mekong South of China

10.4 Erosion, Sediment Storage and Sediment Transfer in the Mekong

10.5 Management of the Mekong and its Basin

10.5.1 Impoundments on the Mekong

10.5.2 Anthropogenic Modification of Erosion and Sedimentation on Slopes

10.5.3 Degradation of the Aquatic Life

10.6 Conclusion

Questions

References

11 Large Arctic Rivers

Introduction

11.1.1. The Five Largest Arctic River Basins

11.1.2. Climate Change in the Five Large Arctic Basins

11.1.3. River Basin Zones

Box 11.1 The Idealised Fluvial System Model (Schumm 1977)

11.2 Physiography and Quaternary Legacy. 11.2.1 Physiographic Regions

11.2.1.1 Active Mountain Belts and Major Mountain Belts with Accreted Terranes (Zone 1)

11.2.1.2 Interior Plains, Lowlands, and Plateaux (Zone 2)

11.2.1.3 Arctic Lowlands (Zone 3)

11.2.2 Ice Sheets and Their Influence on Drainage Rearrangement

11.2.3 Intense Mass Movement on Glacially Over-steepened Slopes

11.3 Hydroclimate and Biomes. 11.3.1 Climate Regions

11.3.2 Biomes

11.3.3 Wetlands

11.4 Permafrost

11.4.1 Permafrost Distribution

11.4.2 Permafrost and Surficial Materials

11.4.3 Contemporary Warming

11.5 Anthropogenic Effects. 11.5.1 Development and Population

11.5.2 Agriculture and Extractive Industry

11.5.3 Urbanisation: The Case of Siberia

11.6 Discharge of Large Arctic Rivers. 11.6.1 Problems in Discharge Measurement

11.6.2 Water Fluxes

11.6.3 Water Budget

11.6.4 Nival River Regime

11.6.5 Lakes and Glaciers

11.6.6 River Ice: Freeze and Break Up

11.6.7 Scale Effects

11.6.8 Effects of River Regulation

11.6.9 Historical Changes

11.7 Sediment Fluxes. 11.7.1 Complications in Determining Sediment Fluxes Both Within Arctic Basins and to the Arctic Ocean

11.7.2 Flux of Suspended Sediment and Dissolved Solids

11.7.3 Historical Changes in Water and Sediment Discharge in the Siberian Rivers

11.7.4 Suspended Sediment Sources and Sinks in the Mackenzie Basin

11.7.4.1 Sediment Yield in the Mackenzie Basin

11.7.4.2 West Bank Tributary Sources

11.7.4.3 Bed and Bank Sources

11.8 Nutrients and Contaminants

11.8.1 Supply of Nutrients

11.8.2 Transport of Contaminants

11.9 Mackenzie, Yukon and Lena Deltas. 11.9.1 Mackenzie Delta

11.9.2 Lena Delta

11.9.3 Yukon–Kuskokwim Delta

11.10 Significance of Large Arctic Rivers

Acknowledgment

Questions

References

12 Climate Change and Large Rivers. 12.1 Introduction

12.2 Global Warming: Basic Concept

12.3 A Summary of Future Changes in Climate

12.4 Impact of Climate Change on Large Rivers

12.5 Climate Change and a Typical Large River of the Future

12.6 Conclusion

Questions

References

Index

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Отрывок из книги

Avijit Gupta

School of Earth, Atmospheric and Life Sciences

.....

The size of the basin and the river is determined by plate tectonics and the amount of precipitation received by the area. The size of the river may change because of (i) plate movements which may lead to crustal spread or shortening and (ii) increase or decrease of precipitation. A large river therefore has a beginning and an end, and exists for a length of time. Several rivers such as the Mississippi or the Nile are very old and include parts of an earlier system. Many large rivers of the present are much younger, a number of them coming into existence or being drastically modified after the formation of the young fold mountains such as the Andes or the Himalaya.

Rain over the upper basin plus the snow and glacial melt on the Tibetan Plateau produce about half of the discharge of the river. The rest arrives mainly from the overflow of two lakes (Dongting and Poyang) in the middle Yangtze. Annual rainfall gradually increases downstream, from 400 mm in the upper basin to 1600 mm in the lower. The annual discharge of the river increases downstream: 1.4 × 104 m3 s−1 at Yichang (4300 km from the source); 2.3 × 104 m3 s−1 at Hankou near Wuhan (about 1000 km from Yichang); and 2.8 × 104 m3 s−1 at Datong (about 700 km further east) (Chen et al. 2001 and references therein). The discharge follows the seasonal precipitation but is slightly damped. The wet season floods in the upper Changjiang are caused by the steep rivers of Sichuan. The common sources of floodwater in the middle Changjiang below the three gorges are the Han River from the north joining the Changjiang at Wuhan, and the overflow from the Dongting and Poyang Lakes downstream.

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