UNT GEOG 3350 - Gravity (23 pages)

Previewing pages 1, 2, 22, 23 of 23 page document View the full content.
View Full Document

Gravity



Previewing pages 1, 2, 22, 23 of actual document.

View the full content.
View Full Document
View Full Document

Gravity

63 views


Pages:
23
School:
University of North Texas
Course:
Geog 3350 -
Documents

Unformatted text preview:

Gravity II Slope Processes and Landforms Controls On Mass Wasting Mass wasting occurs on slopes even very gentle slopes because weathering attacks the surface rock allowing the resulting weak soil and regolith to be pulled downslope by gravity Since weathering is a continuous process many slopes become weaker and weaker until eventually they can no longer withstand the pull of gravity and move downslope i e shear stress becomes larger Harry Williams Geomorphology than strength 1 Types of Mass Wasting Based on 1 MATERIAL TYPE Rock Soil Regolith debris mix of fine and coarse sediment earth mud fine sediment Note the deposits of mass wasting are collectively known as COLLUVIUM 2 TYPE OF MOTION A Falls Free fall of material under gravity forms cliffs and talus slopes Rockfall from a steep cliff talus slope at base of cliff Harry Williams Geomorphology 2 Slides movement of slope material over a well defined planar surface These commonly occur where there are joints bedding planes or fractures parallel to the surface of a slope 1925 Gros Ventre rockslide Wyoming Sandstone slid over a saturated clay layer Harry Williams Geomorphology 3 In thick saturated unconsolidated sediments a slide can be rotational producing a slump scarp Note stepped appearance of slope Harry Williams Geomorphology 4 Large slump triggered by wave undercutting reducing strength California Harry Williams Geomorphology 5 Flows High fluid content behaves like a viscous liquid flow Coarse material mixed with mud DEBRIS FLOW Fine material alone referred to as an EARTHFLOW unconfined or MUDFLOW if confined to a channel When mudflows emerge from channels they build ALLUVIAL FANS Harry Williams Geomorphology 6 Earthflow saturated soil unconfined to channel Harry Williams Geomorphology 7 Mudflow stream choked with mud clay Common in flash floods in arid regions Where mudflows emerge from channels onto flat valley floors alluvial fans are built Harry Williams Geomorphology 8 Creep Heave Slow movement of near



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Gravity and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Gravity and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?