1. From the Mountain to the Sea: Rivers and Erosion Dr Allen Gontz Coastal Geologist & Geophysicist EEOS Dr Allen Gontz Coastal Geologist & Geophysicist EEOS EEOS 120, Fall 2009 3 Nov 2009 Join me as we watch the travel log of our friends Water and Sand

2. Today’s Journey  Rivers –Types –Characteristics  Deltas –Form –Function  What Role Does Erosion Play?  Rivers –Types –Characteristics  Deltas –Form –Function  What Role Does Erosion Play?

3. Stream Hydrograph Image courtesy of U.S. Environmental Protection Agency

4. Stream Regions Images removed due to copyright restrictions.

5. Aggradation v Degradaton Images removed due to copyright restrictions. See image at http://www.ingeba.org/lurralde/lurranet/lur30/30soria/30soria1.gif

6. Figure by UMB OpenCourseWare. Transport v. Supply

7. Meander Evolution Images removed due to copyright restrictions.

8. River Sinuosity Images removed due to copyright restrictions.

9. Braided River Systems

10. Braided River, Jasper NP Images removed due to copyright restrictions. Photo by Hillebrand, SteveHillebrand, Steve

11. Braided River Flood Plain Images removed due to copyright restrictions.

12. Braided Flow Image courtesy of NASA

13. Bar Types Images removed due to copyright restrictions.

14. Meander Evolution Images removed due to copyright restrictions.

15. Braided Morphology Images removed due to copyright restrictions.

17. Straight Channel Flow Images removed due to copyright restrictions.

18. Meandering Rivers Systems

19. Meandering Morphology Images removed due to copyright restrictions.

20. Meandering Channel Flow Images removed due to copyright restrictions.

21. Meander Evolution The Shape of a River Straight Sinuous Meandering Images removed due to copyright restrictions.

22. Meander Flood Plain Images removed due to copyright restrictions.

23. Oxbow Formation Images removed due to copyright restrictions.

24. Mississippi Meanders Images removed due to copyright restrictions.

25. Mississippi Meanders Images removed due to copyright restrictions.

26. Meander Types Images removed due to copyright restrictions.

27. Stream Classification

28. Stream Character

29. Stream Cross Sections Images removed due to copyright restrictions.

30. Channel Types Images removed due to copyright restrictions.

31. Stream Morphology & Slope Images removed due to copyright restrictions.

32. Control of Slope Images removed due to copyright restrictions.

33. Rosgen Classification Images removed due to copyright restrictions.

34. Erosion and Sediment Transport

35. Sediment Transport Image courtesy of USGS

36. Stream Bank Processes Images removed due to copyright restrictions.

37. Flood Plain Cross Section Images removed due to copyright restrictions.

38. Flood Plain Evolution Images removed due to copyright restrictions.

39. Image courtesy of Karrock, under the Creative Commons Attribution-Share Alike 3.0KarrockCreative CommonsAttribution-Share Alike 3.0 Hjulstrom Diagram

40. Sediment Transport Images removed due to copyright restrictions.

41. Grain Size

42. Delta Systems

43. DeltasDeltas  Definition: –An alluvial/fluvial deposit, usually triangular in shape, at the mouth of rivers, streams or tidal inlets –Location were rivers discharge into large bodies of standing water (lakes or oceans) –Change in velocity facilitates the river dropping its sediment load and allowing for the rapid aggradation of a sediment deposit  Definition: –An alluvial/fluvial deposit, usually triangular in shape, at the mouth of rivers, streams or tidal inlets –Location were rivers discharge into large bodies of standing water (lakes or oceans) –Change in velocity facilitates the river dropping its sediment load and allowing for the rapid aggradation of a sediment deposit

44. Processes Controlling Delta Morphology

45. Mississippi River Delta - the classic birds foot Images removed due to copyright restrictions.

46. ChannelizedSectionLowerMississippi River Delta; CurrentTerminalLobe Images removed due to copyright restrictions.

47. The Nile - the classic wave- dominated Images removed due to copyright restrictions.

48. The Fly - the classic tide-dominated Images removed due to copyright restrictions.

49. Delta Development Images removed due to copyright restrictions.

50. Delta Evolution - the Mississippi River Delta Images removed due to copyright restrictions.

51. Delta Evolution - the Mississippi River Delta Images removed due to copyright restrictions.

52. The Mississippi & the USACE Images removed due to copyright restrictions.

53. Old River Flow Control Images removed due to copyright restrictions.