Forest Fires: Behavior And Ecological Effects

Other | March 1, 2001

byJohnson, Edward A., Edward A. Johnson

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Even before the myth of Prometheus, fire played a crucial ecological role around the world. Numerous plant communities depend on fire to generate species diversity in both time and space. Without fire such ecosystems would become sterile monocultures. Recent efforts to prohibit fire in fire dependent communities have contributed to more intense and more damaging fires. For these reasons, foresters, ecologists, land managers, geographers, and environmental scientists are interested in the behavior and ecological effects of fires. This book will be the first to focus on the chemistry and physics of fire as it relates to the ways in which fire behaves and the impacts it has on ecosystem function. Leading international contributors have been recruited by the editors to prepare a didactic text/reference that will appeal to both advanced students and practicing professionals.

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Even before the myth of Prometheus, fire played a crucial ecological role around the world. Numerous plant communities depend on fire to generate species diversity in both time and space. Without fire such ecosystems would become sterile monocultures. Recent efforts to prohibit fire in fire dependent communities have contributed to mor...

Format:OtherDimensions:594 pages, 1 × 1 × 1 inPublished:March 1, 2001Publisher:Academic PressLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0080506747

ISBN - 13:9780080506746

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Table of Contents

Contributors

Preface

Acknowledgments

1 Strengthening Fire Ecology's Roots

I. Introduction

II. Processes

III. Transfer Rates and Budgets

IV. Examples of Traditional vs. Proposed Approach

References

2 Flames

I. Introduction

II. Basic Aspects of Combustion in Forest Fires

III. Temperature, Velocity, Species Concentration, and Flame Height

IV Premixed and Diffusion Flames

V. Extinction of Diffusion Flames

VI. Diffusion Flames and Scaling Analysis

VII. Spreading Flames

VIII. Structure of Flame Base

IX. Conclusions

Notation

References

3 Combustion Chemistry and Smoke

I. Introduction

II. Fuel Chemistry and Combustion

III. Smoke Production

IV. Minimizing Smoke Production

V. Conclusions

References

4 Water Relations of Forest Fuels

I. Introduction

II. Forest Fuels

III. Fuel Moisture Relationships

IV. Moisture Content Estimation

Notation

Additional Reading

References

5 Wildland Fire Spread Models

I. Introduction

II. Head Fire Rate of Spread (Physical Principles and their Mathematical Embodiment)

III. Head Fire Rate of Spread: Australia

IV. Head Fire Rate of Spread: United States

V. Head Fire Rate of Spread: Canada

VI. Smoldering

VII. Whole Fire Modeling-Fire Shape

Notation

References

6 Wind-Aided Fire Spread

I. Introduction

II. Laboratory-Scale Setup

III. Fire Spread Model

IV. Preliminary Testing of the Model

V. Test Results for the Effect of Wind Speed and Fuel Loading on the Rate of Fire Spread

VI. Conclusions

Notation

Recommended Reading

References

7 Fire Plumes

I. Introduction

II. Modeling Fire Temperature Maxima

III. Plumes above Fires in a Cross Wind

Notation

References

8 Coupling Atmospheric and Fire Models

I. Introduction

II. Vorticity Dynamics in a Fire

III. Coupling between Atmosphere and Fire

IV. The Elements of Fire Modeling

V. Modeling the Atmosphere

VI. The Coupled Fire-Atmosphere Modeling Approach

VII. Idealized Studies of Wildfire Behavior

VIII. Infrared Observations of Fires

IX. Conclusions and Future Work

Appendix I. Circulation and Vorticity

Appendix II. Development of Vertical Rotation in a Frictionless Fluid

Appendix III. Generation of Vertical Motion in Rotating Convective Cells

Notation

References

9 Surface Energy Budget and Fuel Moisture

I. Introduction

II. Evapotranspiration Processes and the Meteorological Controlling Factors

III. Estimation of Potential Evapotranspiration Rates

IV. Functional Dependence of PET and AET

V. Characteristics of PET

VI. Near-Surface Environment

VII. Models of Land-Surface Interactions

VIII. Remote Sensing of the Surface Energy Budget

IX. Fire Weather Rating Systems

Notation

Suggested Reading List

References

10 Climate, Weather, and Area Burned

I. Introduction

II. Weather and Area Burned-Synoptic Surface Features

III. Weather and Area Burned-Upper Air Features

IV. Teleconnections

V. Future Warming and Area Burned

VI. Summary

References

11 Lightning and Forest Fires

I. Introduction

II. Lightning

III. Previous Studies of Lightning-Initiated Fire

IV. Interaction between Lightning and Fuels

V. How Ignition Occurs

VI. Ignition Experiments with Real Forest Fuels

VII. Generating Models for Operational Use

VIII. Smoke, Lightning, and Cloud Microphysics

IX. Global Implications of Lightning Ignition Characteristics

X. Conclusion

References

12 Statistical Inference for Historical Fire Frequency Using the Spatial Mosaic

I. Introduction

II. Graphical Analysis

III. Statistical Inference with Prespecified Change Points

IV. The Efficiency of Sample vs. Map Data

V. Determining Epochs of Constant Fire Frequency

References

13 Duff Consumption

I. Introduction

II. Characteristics of Duff

III. Empirical Studies of Duff Consumption

IV. Flaming Combustion

V. Smoldering Combustion and Pyrolysis

VI. Models of Smoldering Combustion

VII. Contribution of Smoldering Combustion Models to Understanding of Duff Consumption

Notation

References

14 Fire Effects on Trees

I. Introduction

II. Effects of Fire on the Tree Bole

III. Effects of Fire on Canopy Components

IV. Root Necrosis

V. Tree Mortality

VI. Discussion

Notation

Additional Readings

References

15 Forest Fire Management

I. Introduction

II. The Relationship between Fire and Forest Land Management Objectives

III. Assessing Fire Impacts

IV. Forest Fire Management Organizations

V. Level of Fire Protection Planning

VI. Some Challenges

Further Reading

References

Index