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Physical modelling of the removal of Glines Canyon Dam & Lake Mills

Physical modelling of the removal of Glines Canyon Dam & Lake Mills. By Chris Bromley, Gordon Grant, Colin Thorne University of Nottingham / Oregon State University. Source: National Park Service. Elwha River Project.

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Physical modelling of the removal of Glines Canyon Dam & Lake Mills

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  1. Physical modelling of the removal of Glines Canyon Dam & Lake Mills By Chris Bromley, Gordon Grant, Colin Thorne University of Nottingham / Oregon State University

  2. Source: National Park Service

  3. Elwha River Project “…the full restoration of the Elwha River ecosystem and the native anadromous fisheries…’ Elwha River Ecosystem and Fisheries Restoration Act, 1992 (P.L. 102-495)

  4. Lake Aldwell ~ 2.98 million m3 Lake Mills ~ 11.85 million m3

  5. Image courtesy of National Park Service Baselevel

  6. 2.29 m = 2.8 cm

  7. Research hypotheses The greater the magnitude of the drop in baselevel, • The greater the incision and lateral adjustment that will occur within the original delta area • The more rapidly sediment will erode from the delta surface • The greater the total volume of original delta sediment will be eroded

  8. Dam

  9. Horizontal scale = 1 : 310 Vertical scale = 1 : 81.7 Vertical distortion = 3.79

  10. 3.3 km = 10.65 m

  11. 1.067 km = 3.44 m

  12. 45.72 m = 0.56 m

  13. Assume uniform steady flow • Similitude of Froude No. & Shields No.

  14. Qm = Qp * lHlV1.5 Qm Dgrowth = 110 l/min → Qp = 420 m3/s (14,825 cfs)

  15. R7 3x - left R11 3x - center 0 - 21 0 - 21

  16. R7 3x - left R11 3x - center 3 - 21 3 - 21

  17. R7 3x - left R11 3x - center 6 - 21 6 - 21

  18. R7 3x - left R11 3x - center 9 - 21 9 - 21

  19. R7 3x - left R11 3x - center 12 - 21 12 - 21

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