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In The Name Of GOD

In The Name Of GOD. SEFIDRUD DAM DESILTATION OPERATION by M.H.Ranjbar Taklimy & E. Tolouie Sefidrud Reservoir desiltation committee, Gilan regional water board, Iran August 8-15,2005, Yichang,Hubei Province, China. LOCATION OF SEFIDRUD DAM AND CATCHMENT. SEFIDRUD RIVER SYSTEM. SEFIDRUD DAM.

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In The Name Of GOD

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  1. In The Name Of GOD SEFIDRUD DAM DESILTATION OPERATION by M.H.Ranjbar Taklimy & E. Tolouie Sefidrud Reservoir desiltation committee, Gilan regional water board, Iran August 8-15,2005, Yichang,Hubei Province, China

  2. LOCATION OF SEFIDRUD DAM AND CATCHMENT

  3. SEFIDRUD RIVER SYSTEM

  4. SEFIDRUD DAM Evacuating system: . 2 morning glory spillways, 3,000 m3/s . 2 auxiliary spillways, 2,000 m3/s . 5 power intakes, 160 m3/s . 5 bottom outlets, 980 m3/s . Total capacity, 6000 m3/s

  5. SEFIDRUD DAM

  6. SEFIDRUD DAM • Location, 250 km north west of Tehran • Type, Buttress-gravity • Max height, 106 m • Crest length, 425 m • Crest elevation, 276.95 masl (metre above sea leavel) • Main purpose, Irrigation (Mostly rice field)

  7. SEFIDRUD RESERVOIR

  8. RESERVOIR SEDIMENTATION DATA

  9. FEASIBILITY OF FLUSHING OPERATION Changing the rule curve

  10. FEASIBILITY OF FLUSHING OPERATION Changing the rule curve

  11. FEASIBILITY OF FLUSHING OPERATION Changing the rule curve

  12. FEASIBILITY OF FLUSHING OPERATION Changing the rule curve

  13. FEASIBILITY OF FLUSHING OPERATION Environmental impacts

  14. MITIGATION OF NEGATIVE EFFECTS In order to mitigate negative environmental impacts, comprehensive studies on environmental aspects of sedimentation and desiltaion is carried out since 2003, we hope that the result of the studies will help us to achieve sustainable development in sefidrud river system.

  15. RESERVOIR SEDIMENTATION DATA

  16. FLUSHING WITH FLOW DIVERSION Diversion scheme Main features

  17. FLUSHING WITH FLOW DIVERSION Diversion scheme Layout

  18. FLUSHING WITH FLOW DIVERSION Diversion scheme (b) diversion(pilot)canal (a) diversion dam Components

  19. FIELD OBSERVATIONS Types of erosion occurred along diversion canal

  20. Outflow water vs outflow sediment

  21. 1:

  22. Rehabilitation of reservoir capacity

  23. CONCLUSION: 1- Flushing operation is a suitable tool to conserve and rehabilitate reservoir capacity, provided suitable outlet system is avilable. 2- Flow diversion to the flood plain is an effective and practical method to increase desiltation efficiency in flushing operation. 3- In sefidrud reservoir, flow diversion as a supplementary measure to flushing operation was proved to be very efficient in reducing trap efficiency of the reservoir, as presented below: • trap efficiency (inflow sed.- outflow sed.) Inflow sed. during 17 years of normal operation=79%. • trap efficiency during 3 years of flushing operation=37% • trap efficiency during 7 years of flushing operation + flow diversion = - 96%.

  24. PHOTOS

  25. SEFID - RUD RESERVOIR DESILTATION Note: Foreset of deposited sediment is above power intake level

  26. Different views of deposited sediment U/S of dam

  27. Different views of deposited sediment U/S of dam

  28. Different views of deposited sediment U/S of dam

  29. Formation of main thalweg with in reservoir area

  30. Sampling of suspended sediment

  31. Qezel Owzan Diversion Dam during construction

  32. View of Diversion Dam after completion

  33. Digging pilot canal

  34. Initial stage of diversion

  35. Retrogressive erosion along pilot canal

  36. Massive slide in unconsolidated deposit

  37. Constructing fuse Plugg to create Hydraulic shock

  38. Constructing fuse Plugg to create Hydraulic shock

  39. Extensive erosion of new thalweg due to Hydraulic shock (dam break)

  40. Extensive erosion of new thalweg due to Hydraulic shock (dam break)

  41. The End

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