OREGON STATE UNIVERSITY
Geomorphology Brown Bag - Fall 2005
Thursday 12-1PM in ALS 3006
Landscape Evolution

Landscape evolution models are generally driven by erosion from water flowing over the land’s surface, due to an energy gradient inherited from (and resulting in) topography. Young volcanic terranes are typically characterized by extensive lava fields having some topographic relief but little or no fluvial dissection. In these landscapes, development of drainage networks is fundamentally limited by the very high permeability of the rocks, resulting in virtually all precipitation infiltrating the surface and contributing to deep groundwater. In the absence of surface runoff, drainage networks develop extremely slowly and by different suites of processes than in landscapes where surface and shallow sub-surface flow prevail. Mechanisms and rates associated with these weathering processes are poorly understood, and likely to vary by climatic and geomorphic setting.

This quarter we will explore the development of drainage networks on porous lava flows, drawing from examples in the Oregon Cascades, Jordan, Libya, Hawaii, the Galapagos and other areas we would like to go on field trips.

email Sarah to get on our weekly reminder list - please recruit new students!

Date Presenter Topic
Sep 29 2005

NO MEETING

Oct 6 2005

Anne Jefferson

Introduction to the landscapes of the Oregon Cascades

Oct 13 2005

Stephen Lancaster

FSL West Conference Room

Landscape Evolution Theory and Modeling in Geomorphology

Oct 20 2005

Jay Noller

"Subsurface Slime Shapes Streams"

Oct 27 2005

Group

T.J. Battin, D. Sengschmitt (1999). Linking Sediment Biofilms, Hydrodynamics, and River Bed Clogging: Evidence from a Large River. Microb Ecol 37:185–196.

ruqe26yv895qlrbd.pdf
Nov 3 2005

Group

Experimental Design for biofilm growth/drainage network development in flume

Nov 5 2005

Saturday Field Trip

Collect soil, lichen, rocks, etc at McKenzie Pass

Nov 10 2005

Group

Look at the rocks

Nov 17 2005

Group

Discussion

Nov 24 2005

NO MEETING

THANKSGIVING