The Geomorphic Response of Rivers to Dams: Case Study 1: Steep Bedrock Rivers

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Presenter: Scott McBain
Length: 3 Parts

View: Part 1 | Part 2 | Part 3

       

       Topics:

       Part 1

• Presentation Outline
• Proposed Dam Site Graphic
• Hydrology of the Clavey River
• water year classification to illustrate inter-annual variability for rainfall/snowmelt dominated river
• Intra-annual variability for snowmelt/spring dominated streams
• Intra-annual variability for snowmelt/spring dominated streams
• Differences in magnitude- duration- timing- and frequency between water year classes
• Longitudinal variability influences sediment supply
• Sediment Regime-moderate episodic supply mechanisms
• Lets Consider
• Change in Cherry Creek water yield
• Changes to Cherry Creek flood frequency
• Variable flood frequency and geomorphic processes(ext wet)
• Variable flood frequency and geomorphic processes(normal)
• Variable flood frequency and geomorphic processes(crit dry)
• Summary of changes
• Potential impacts

       Part 2

• Selected conceptual models and analytical tools
• Geomorphic changes: Sediment mitigation by tributaries
• Geomorphic changes: Resulting impact on storage
• Geomorphic changes: in-channel storage reservoirs
• Conceptual changes in bed mobility thresholds and frequency
• Nested geomorphic features-large scale example
• Nested geomorphic features-large scale another example
• Nested geomorphic features-medium scale example
• Nested geomorphic features-small scale example
• Nested geomorphic features and mobility thresholds

       Part 3

• Biological hotspots
• Typical channel morphology
• Less common channel morphology
• Dam impacts on Biota?
• Cherry Creek Gaging Station
• Fine sediment accumulation?
• SUMMARY AND PUNCHLINE: How do you go about addressing these questions?

These presentations were produced by Michael J. Furniss and Jeff Guntle, of the US Forest Service, PNW and PSW Research Stations.
US Forest Service, Pacific Northwest Research Station, Pacific Southwest Research Station, Stream Systems Technology Center