1. Floodplain Management SESSION 3 Stream Systems on Dynamic Earth Glaciation & Erosion Processes Prepared By Donald R. Reichmuth, PhD.

2. Glacial & Erosion Framework Objectives: Glacial conditions in North America for the last 30,000 years affect river basins and floodplains Rates and processes of erosion, transport, and deposition The production and movement of sediment by the agents/processes of erosion -- water, ice, gravity, and wind Case study team assignments

3. Glaciation & Surface Processes Glaciation Alpine Glaciers Continental Glaciers Geomorphology Surface Forming Processes –Water –Ice –Gravity –Wind

4. Northern Hemispheric Glacial Areas 16,000 B.P. NOTE: Portions Of Alaska Are Ice Free

5. Pleistocene Glaciation Note: Alpine Glaciers Continental Glaciers Ice Marginal Rivers Alaska Ice Free Area

6. Glacial Impact Areas

7. Preglacial Teays Basin Teays Basin Overrun By Ice Channel Buried Ohio River Forms Drains Basin

8. Western Glacial Lakes 15,000 B.P. –Climate Much Wetter Than Present –Large Basins Had Internal Drainage

9. Loess Wind Blown Silt From Glaciers Rock Flour Stream Banks Stand Vertical When Stable

10. Glacial Rebound Contours In Meters Uplift

11. Great Lakes Glacial Rebound Contours – Uplift per 100 Yrs.

12. Sea Level Changes 16,000 Years BP -- 120 Meters Lower 6,000 Years BP – Reached Present Level Near Future – Expected To Rise

13. Holocene Sea Level Changes Primary Cause --- Glacial Melting In The Northern Hemisphere

14. Erosion In River Basins Controlling Factors: Chemical vs. Mechanical Weathering –Temperature –Precipitation Basin Gradient Basin Soil/Bedrock Type Tectonic Activity

15. Chemical & Mechanical Weathering

16. Erosion Processes

18. Mass Movements

19. Class Handout

20. Slide Presentation Prepared By Geomax, P.C. Dr. Donald R. Reichmuth, President 1023 W. 30 th Ave. Spokane, WA 99203-1324 Phone & FAX – 509-838-6390 E-mail – geomax@comcast.net