Effective Discharge Nooksack Watershed

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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

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

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