REPORT:
Debris Flows -- Geologic Process and Hazard, Illustrated by a Surge Sequence at Jiangjia Ravine, Yunnan, China

Table of Contents

• Abstract
• Introduction - why study debris flows?
  • Debris flows in Southwest China
  • The great rivers of China and erosion of the landscape
• What can we learn from the video?
  • Flows of water and sediment comprise a spectrum of increasing sediment content from floods, to hyperconcentrated flows, to debris flows
  • Debris flows can move huge boulders
  • Forming rivers of rock
  • Debris flows are faster than flood waves
  • Flow geometry - depth and width - and channel slope
  • How much sediment is moved by individual surges and by complete series?
  • Why debris flows can crush man-made structures - powerful impact forces
  • Like wet cement
  • Why multiple surges?
  • Ballistic clast ejection - estimating flow velocity from runup height
  • Estimating cross sections of debris flows
  • Knickpoints
  • How and why we seek to identify deposits of old debris flows
  • Can people be warned that a debris flow is coming?
  • Mitigation and countermeasures
• Acknowledgments
• References cited, and for further study
• Appendix