Hydrology and Geomorphic Evolution of Basaltic Landscapes, High Cascades, OR
Presenter: Anne Jefferson
Length: 2 Parts, 42 min 37 s
View: Part 1 | Part 2 | Part 3
Topics:
Part 1
- Hydrology and Geomorphic Evolution of Basaltic Landscapes - High Cascades - Oregon Geology
- Influences 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
Part 2
- 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
Part 3
- 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 - endmembers
- Topographic form - intermediates
- Processes that reduce permeability
- Drainage development on permeable landscapes