Climate Change and...

Runoff Generation in Forested Watersheds- A Half-Day Shortcourse

CCRC Home > Climate Change Presentations > Runoff Generation in Forested Watersheds- A Half-Day Shortcourse

There are THREE ways to view this presentation:

Quickview Play the quickview version (slides and audio). Player instructions.

Due to the length of this presentation, please view the Portable Electronic Presentation.

PEP Watch the Portable Electronic Presentation (PEP).

Open in new window

View this presentation with high-quality slides, video of the presenter, Web links, and interactive table of contents.

What is a PEP?

Download Download this presentation.

Not available


Search for a presentation

About The Presenter

Jeff McDonnell, Richardson Chair in Watershed Science, Oregon State University.

About This Presentation

Running time: 3 hours, 1 minute and 16 seconds
Production by: M.J. Furniss and J. Guntle, Communications and Applications, PNW and PSW Research Stations

Topics covered:

  • Runoff Generation in Forested Watersheds
  • Introductions
  • Background
  • Benchmark Papers
  • Good Basic Material
  • Advanced Material
  • Journals You Should Consult...
  • Basic Question That Will Be Addressed
  • Traditional Forest Hydrology
  • Problems With the Paired Watershed Approach
  • What This Course Will Address
  • Mechanisms—Our focus
  • Why These Flow Pathways and Mechanisms Are Important
  • Water Residence Time Is Important
  • What We Will and Will Not Cover
  • Hillslope and Watershed Hydrology
  • Experimentalist and Modeler
  • Shortcourse Outline
  • Example Locations
  • Runoff Generation Overview
  • This Section
  • Our History
  • Runoff Generation at a Point Depends on
  • Storm Characteristics and Watershed Runoff
  • Natural Conditions for Infiltration Excess Overland Flow
  • Other Factors that Promote IEOF
  • READ
  • Hydraulic Conductivity of Some Materials
  • Hydrological Pathways
  • Hewlitt and Hibbert's, 1967 VSAC
  • SOF Country
  • Saturated Areas: We Can Estimate Based on Topography
  • Saturation Overland Flow
  • Spatial and Temporal Dynamics
  • Subsurface Stormflow
  • How This Might Happen
  • But, Also Can Be Highly Preferential
  • Dominant Processes of Hillslope Response to Rainfall
  • Model Conceptualization of These Processes
  • Proccess assumptions
  • 3D Diagram
  • Plot Scale
  • This section
  • Plot Scale: Example, Inceptisols
  • What Changes With Depth
  • Depth Function
  • Drainable Porosity
  • Ksat
  • But Don't Forget....
  • Soil Profiles and Cone Penetrometer
  • The Plot Scale Simplified
  • Pores
  • Network-Like
  • If Darcy Were Alive Today...
  • How Infiltration Really Works
  • Infiltrations in Macroporous Soils
  • Classification of Macropores
  • If We Were to Dig a Pit
  • In Other Words
  • Macropores: Engineers Knew About This > 100 Years Ago
  • Observations
  • Observations
  • Plant Roots
  • Hillslope Scale
  • This section
  • From Vertical to Lateral Flow
  • Vertical to Lateral
  • Surface and Bedrock Topography
  • Hillsope Trenching
  • Surface and Bedrock Topography
  • Flow Distribution Across the Trench
  • Transient Saturation: Spatial Pattern 5mm
  • Transient Saturation: 9mm
  • Transient Saturation: 16mm
  • Transient Saturation: 29mm
  • Transient Saturation: 50mm
  • Transient Saturation: 59mm
  • Transient Saturation: 61mm
  • Threshold Effects
  • Threshold Effects- A Common Observation
  • Fill and Spill Behavior
  • Visualizing These Processes
  • Or, if a 2-Layer System...
  • Or, if a 2-Layer System cont.
  • Equals Transmissivity Feedback
  • Back to Our Photo...
  • Back to Transmissivity Feedback
  • Pipeflow
  • We See Thresholds for Lateral Pipeflow Also...
  • Wherever We Trench, Pipeflow Dominates
  • Transient Water Table Drives the Pipeflow
  • We've Known About Complexity for a Long Time
  • Catchment Scale
  • This section
  • Soil moisture—Wet
  • Soil moisture—dry
  • Terrain Relationships
  • Threshold Responses
  • Back to the Soil Moisture Diagram
  • Threshold Responses cont...
  • How Catchment Units Sequence
  • Why This Is Important
  • Another Way of Looking at This
  • It's Not Continuous
  • Or, Looking at This Geochemically
  • Discrete Units That Connect and Disconnect
  • From Geographic Source to Time Source
  • The Reality
  • The Old Water Paradox
  • Not a New Idea
  • Stable Isotopes: Hydrological Tool
  • Two-Component Hydrograph Separation
  • Time Source of Water During Events
  • How Old is the old Water?
  • A Recent GEOREF Search
  • Residence Time Methods
  • Convolusion Integral
  • Mean Residence Time
  • Some Reported Mean Residence Times
  • Watershed Model
  • Summary
  • Basic Question That We Addressed
  • One Proviso Before Ending
  • REA: Something to Keep in Your Mind
  • REA: Something That You Can Determine
  • Hillslope and Watershed Hydrology
  • Shortcourse Summary
  • For a More Extended Virtual Course...
bottom right