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Effective Discharge Nooksack Watershed

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Presentation for RRNW 2010

Presentation for RRNW 2010

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  • Geomorphic paradigm; which events do the most work in shaping a channel and floodplain. Large infrequent events or smaller more frequent events

Effective Discharge Nooksack Watershed Effective Discharge Nooksack Watershed Presentation Transcript

  • Recent trends in effective discharge in Northwest Washington
    R. Leif Embertson, MS, PE
    River Restoration Northwest Conference
    February 1st , 2011
  • OBJECTIVE
    • Evaluate changes in effective discharge (Qeff) using USGS gauge records
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • OBJECTIVE
    • Evaluate changes in effective discharge (Qeff) using USGS gauge records
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • OBJECTIVE
    • Evaluate changes in effective discharge (Qeff) using USGS gauge records
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
    25-30% Increase
  • OBJECTIVE
    • Evaluate changes in effective discharge (Qeff) using USGS gauge records
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • OBJECTIVE
    • Evaluate changes in effective discharge (Qeff) using USGS gauge records
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • DEFINITION
    • Effective Discharge (Qeff) – Discharge that transports the largest fraction of annual sediment load over a period of years (Andrews, 1980)
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • STUDY AREA
    • NORTH FORK NOOKSACK RIVER (UPPER WATERSHED)
    • NOOKSACK RIVER AT FERNDALE (LOWER WATERSHED)
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • STUDY AREA
    UPPER WATERSHED
    u
    LOWER WATERSHED
    • u
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • METHODS
    • Hydrology
    • Bin Size and Type
    • Arithmetic vs log
    • Sediment Transport (Observed or Equations)
    • If equations, Hydraulics R=aQb
    • Sensitivity analysis
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • RESULTS
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
    UPPER WATERSHED
  • RESULTS
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
    LOWER WATERSHED
  • RESULTS
    • Recent trends in hydrologic gauge records are effecting the channel forming discharge
    • Changes in upper watershed are more significant than in lower watershed
    • Effective discharge (Qeff)
    • Annual sediment load
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • DISCUSSION
    • Alluvial rivers will adjust their form to convey the water and sediment delivered
    • Recent hydrologic patterns will/are causing a channel response
    • Upper watershed(s) are likely to be directly affected and changes more significant (increase in width/depth)
    • Prepare for a excess sediment to be delivered to lowland areas
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • DISCUSSION
    • Are changes in hydrologic patterns a result of:
    • a long term trend?
    • a cyclic pattern within geologic record?
    • statistical noise?
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • NEXT STEPS
    • Expand study to encompass additional watersheds and sites
    • Couple with habitat flow parameters
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion
  • THANK YOU
    [INSERT PHOTO HERE]
    Objective
    Definition
    Study Area
    Methods
    Results
    Next Steps
    Discussion