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Hydrology and Geomorphic Evolution of Basaltic Landscapes, High Cascades, OR

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About The Presenter

Anne Jefferson, Oregon State University, Department of Geosciences


About This Presentation

Running time: 42 minutes and 37 seconds.
Given: September 20, 2006, Ph.D. Defense.
Production by: M.J. Furniss and J. Guntle, Communications and Applications, PNW and PSW Research Stations

Topics covered:

  • Hydrology and Geomorphic Evolution of Basaltic Landscapes—High Cascades—Oregon Geology
  • Influences on Hydrology
  • Some Ways It Might
  • More Ways
  • Cascades Geology and Streamflow Patterns
  • Geologic Setting
  • Western Cascades
  • Subsurface Storm Flow
  • Flows
  • High Cascades
  • Groundwater Flow
  • High Cascade Springs
  • Geology Predicts Summer Streamflow
  • August Flow From Springs
  • March Flow From Springs
  • Volcanic History and Flow Patterns
  • Study Area
  • Flowpaths Do Not Follow Topography
  • Stable Isotopes
  • Springs Recharge in Young Lavas
  • Recharge Areas
  • Geology Trumps Topography
  • Upper McKenzie Springs
  • Remainder of Recharge
  • Flowpaths and Ages
  • Shallow Flowpaths
  • How Old Is the Water?
  • Ages Ranges From 3 to 14 Years
  • Aquifer Volume
  • Cracks in Volcanic Rock
  • Aquifer Thickness
  • Groundwater Velocity
  • Hydraulic Conductivity
  • Groundwater Flowpaths and Geologic History
  • Hydrogeologic Controls
  • Motivation: Warming Winters
  • Study Watersheds
  • Santiam Junction Precipitation
  • Clear Lake Water Budget
  • Temporal Centroid
  • Autumn Minimum Discharge
  • Sensitivity to Climate Variability
  • Drainage Development
  • Landscape Evolution
  • Models of Drainage Evolution
  • Depression Linkage
  • Groundwater Seepage Erosion
  • Knickpoint Migration
  • Permeability Reduction
  • Chronosequence of Landscapes
  • Drainage Density Increases Over Time
  • Chronosequence of Landscapes
  • Major Springs Persist for =1 Ma
  • Chronosequence of Landscapes
  • Topographic form—end Members
  • Topographic form—intermediates
  • Processes that reduce Permeability
  • Drainage Development on Permeable Landscapes
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