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Sedimentary Geology Geos 240 – Chapter 7 Sediment Transport Processes

Sedimentary Geology Geos 240 – Chapter 7 Sediment Transport Processes. Dr. Tark Hamilton Readings from Sediments & Basins: (7:1-41) Camosun College. Crossbeds, Cretaceous Non-Marine NEBC. Hjulstrom Diagram: Caliber vs Velocity.

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Sedimentary Geology Geos 240 – Chapter 7 Sediment Transport Processes

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  1. Sedimentary GeologyGeos 240 – Chapter 7Sediment Transport Processes Dr. Tark Hamilton Readings from Sediments & Basins: (7:1-41) Camosun College

  2. Crossbeds, Cretaceous Non-Marine NEBC

  3. Hjulstrom Diagram: Caliber vs Velocity

  4. Turbulent Boundary LayerCauses Flow Separation:Tractive flow, Entrainment, Suspension

  5. Turbidity Current in a Lab Flume:Dense, Turbulent, Sediment Underflow

  6. Bedform Phase Diagram:Stable Bedforms vs Caliber & Velocity

  7. 2-D PlanarTabularX-bedsPlatte River Nebraska~3.19 m/sec

  8. 3-DLinguoidDunes&TroughX-beds

  9. Flume Observations Laminar Stable Flow Turbulent Flow

  10. Variation in Ripple/Dune shapesVersus Shallowness & Velocity or

  11. Large simple X-bed, Devonian Old Red Sandstone. Scotland

  12. Gravel Dunes Haro Strait Real Gap, no bedforms Unstable turbulent transition

  13. Upper Plane Bed. Platte River Nebraska

  14. Upper Plane Bed. Proterozoic siltstone

  15. Upper Plane Bed. Ordovician calcarenite. Bed bottom & scour

  16. Standing Waves form Antidunes Alaska

  17. Standing Waves form Antidunes California Beach

  18. Climbing Ripples

  19. Climbing Ripples

  20. Climbing Ripples

  21. Planar Cross Beds

  22. Planar Cross Beds

  23. Trough Cross Beds

  24. Trough Cross Beds

  25. Gravel Bar Bedforms, Modern River

  26. Gravel Bar Bedforms, Modern River

  27. Imbrication of Clasts

  28. ReversingTidal CurrentsFloodSlackwaterEbbSlackwater*(not all tides arepurely diurnal!)~basin shape

  29. Symmetric - Tidal Foresets - Asymmetric Or Tidal Delta

  30. New/Full Half

  31. Tidal Bedding Terminology

  32. Tidal Ripple Bedforms, Seattle WA

  33. Wavy Bedding, Cretaceous, Utah

  34. Bedform Type versus Location with Waves

  35. Waves in Shallows, Near Shore

  36. Wave Rippled Modern Beach South CarolinaInterference Patterns in Sandy RipplesFormed During Prior Flood TideBeing Modified in Ebb

  37. Wave Rippled Ordovician Calcarenites, Ottawa Sandbars Herringbone Dolo-grainstones Calsiltites

  38. HummockyCrossStratification(HCS)JurassicOld RedSandstoneYorkshire(domes &mounds)

  39. Storm Driven – Coriolis ControlledDue to Flow in a Rotating Reference Frame

  40. 4 Types of Dunes in Eolian Settings

  41. Dreat Sand Dunes Nat’l Monument, CO

  42. Transverse Dunes, Gobi Desert, China

  43. Transverse Dunes, Gobi Desert, China

  44. Barchan Dunes, Gobi Desert, China

  45. Modern Wind Ripples Climbing Dune Face Lighter Winds Channelled By Older Dunes

  46. Permian Wind Fall Ripples AZ Note Rare Wind Ripple Foresets

  47. Modern Grain Fall Deposits Down Dune Face

  48. Modern Grain Flow Lobes Down Dune Face

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