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Material recharge (AND OTHER HYDROGEOMORPHIC PROCESSES) following shallow landslides. Need slide numbers on all. Matt Sakals John Innes. Reason for Study. Characterization of unstable hillslopes Better understanding of geomorphic processes of material transfer

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  1. Material recharge (AND OTHER HYDROGEOMORPHIC PROCESSES) following shallow landslides Need slide numbers on all... Matt Sakals John Innes

  2. Reason for Study • Characterization of unstable hillslopes • Better understanding of geomorphic processes of material transfer • Hazard characterization for downslope values – residences, transportation and utility corridors, natural values including forests, aquatic life, and aesthetics • Short and long term effects of timber harvesting

  3. Photo 1

  4. Photo 1

  5. PNG Rupture - Work Channel

  6. Charles Creek

  7. Mt. Hayes Road Kennedy Island North Coast

  8. Objectives • To further the understanding of hydrogeomorphic activity in the vicinity of shallow landslide initiation zones • Determine the rate of material accumulation in landslide initiation zones • Repeat failures • Determine the primary controls • Determine the processes of material transfer and their controls • Assess soil features associated with initiation zones • Soil-hydrologic features of the study sites

  9. General Methods • Develop and test an empirical model of soil accumulation • Inventory recent material transport - determine influence of microtopography and surface cover • Assess soil-hydrologic differences between the infilled soils and surrounding hillslope soils

  10. S(Jenny, 1941) = f(cl, o, r, p, t, ...) S – soil formation cl – climate o – organic influences r – topography p – parent material t – time

  11. S(Sakals, 2010) = f(cl, o, r, p, t, ...) S – soil formation accumulation cl – climate o – organic forest influences r – topography p – parent material bedrock t – time

  12. Study Design • Collection of data from a broad range of zero-order basins • Sampling in four areas: North Coast, Southwest Vancouver Island, HaidaGwaii, and south-central Japan

  13. Study Areas

  14. Site Selection • High variability in hillslope configurations • Physical limitations • Zero-order – no stream • Mid-slope position • Shallow soiled slopes • nearly complete evacuation of soil material • Colluvial soils • Forests to be Coastal Western Hemlock (excepting Japan)

  15. Selecting Sites

  16. Dendrochronology

  17. Knocking Cone Penetrometer

  18. Bedrock • Selby’s (1980) Geomorphic Rock Mass Classification

  19. Climate • ClimateBC

  20. Topography • Two scales

  21. Forest • BEC variant • Site Index • Surface cover • Material contributions and structure

  22. Processes

  23. Results

  24. Soil Depth with Time since Failure

  25. Recent Material Transport

  26. Selected Models • Poor performing variables - convergence, siteIndex, scarWidth, PPT911, logged, were minimized by modeling • 12 models omitted • c = constant

  27. Model Testing • c = constant

  28. Recent Material Transport

  29. Frequencies of Recent Material Transport Volumes High magnitude-low frequency Material Transport Events

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