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L. Scott Eaton, Ph.D. Department of Geology and Environmental Science James Madison University

THE ROLE OF DEBRIS FLOWS IN LONG TERM DENUDATION AND LANDSCAPE EVOLUTION OF THE CENTRAL APPALACHIANS. C. L. Scott Eaton, Ph.D. Department of Geology and Environmental Science James Madison University. Death Valley, CA. ~ 140 fatalities. Rapidan Storm, June 1995. C.

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L. Scott Eaton, Ph.D. Department of Geology and Environmental Science James Madison University

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  1. THE ROLE OF DEBRIS FLOWS IN LONG TERM DENUDATION AND LANDSCAPE EVOLUTION OF THE CENTRAL APPALACHIANS C L. Scott Eaton, Ph.D. Department of Geology and Environmental Science James Madison University

  2. Death Valley, CA

  3. ~ 140 fatalities

  4. Rapidan Storm, June 1995 C Blue Ridge Mountains, VA

  5. 775 mm

  6. Research Question: In the Appalachians, are debris flows a significant process in the transportation of sediment from mountainous terrain to the floodplains?

  7. What is the frequency of debris flows? • How much sediment is transported during an event? • What are the long term erosion (denudation) rates in the central Appalachians?

  8. frequency of debris flows

  9. DEBRIS FLOW FREQUENCY IN THE RAPIDAN BASIN from Eaton and others, 2003

  10. Sediment Transport and Denudation

  11. 0.398km2

  12. Before After ? ? ?

  13. 0.398 km2 13, 364 m3

  14. Volume = 13, 364 m3 = 0.034 m Area 0.398 km2 or 398,000 m2 = 3.4 cm

  15. Event Basin Basin Area (km2) Volume of Sediment Eroded (m3) Mean Basin Denuda-tion (cm) Hurricane Camille Willis Cove 4.08 173,488 4.25 Hurricane Camille Ginseng Hollow 1.75 88,727 5.07 Hurricane Camille Polly Wright Cove 2.47 87,707 3.55 Rapidan Flood Jenkins Hollow 0.398 13,364 3.36 Rapidan Flood Teal Hollow 0.123 2,492 2.03 Summary of Basin Denudation of Blue Ridge Systems

  16. Hurricane Camille Rapidan Storm

  17. A Model of AppalachianLandscape Evolution

  18. BEFORE…..

  19. AFTER…..

  20. HIGH “M” LOW (f) LOW “M” HIGH (f)

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