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Topic: Wind Erosion
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A. Mainly in arid (dry) regions – little vegetation
B. Carries only small sediments
Wind erosion mainly occurs:
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Which way was the wind blowing?
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• Ventifact – rock abraded by wind-driven sand
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• Approaching dust storm at Prowers County,
CO. Storm lasted from 4:15 PM to 7:00 PM.
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"Fleeing a dust storm". Farmer Arthur Coble and sons walking in the face of a dust storm, Cimmaron County, Oklahoma. Arthur Rothstein, photographer, April, 1936. (Library of Congress)
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Iraq, 2005
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Dune Formation
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http://highered.mcgraw-
hill.com/sites/0072402466/student_view0/chapter
13/animations_and_movies.html#
http://dli.taftcollege.edu/streams/Geography/Animations/CrossBedding.html
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Types of Dunes
1. Barchan
2. Transverse
3. Linear
4. Parabolic
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Parabolic Dunes, Napeague Bay
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Parabolic Dunes, Napeague Bay
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Parabolic Dunes, Napeague Bay
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Eolian (Wind) Features
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Topic: Wave Erosion
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http://stevekluge.com/geoscience/images/waves2.jpg
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1604/es1
604page01.cfm?chapter_no=visualization
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http://stevekluge.com/geoscience/images/waves2.jpg
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Montauk Lighthouse on top of Turtle Hill, 297 feet from the tip of Montauk Point (1800)
Recent Photo 2001
Wave Erosion
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Wave Erosion
Lake or Ocean waves removing sediments from the beaches.
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North of Santa Cruz, California
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Top View of the Beach
Ocean
Beach
Where is
my towel?
Long Shore Current
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Sand
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Long Shore Current
• Transports water & sediments parallel to the beach.
• Long Island’s (LI) Montauk to NY City (mainly east to west)
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L.I. Natural Beach Features
1) Sand Bar
2) Spit
3) Lagoon (Great South Bay)
4) Barrier Island (Fire Island)
Diagram showing the environments of a barrier island system. (from Blatt, et al, 1980, Petrology of Sedimentary Rocks)
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A sandbar off of Suffolk County, Long Island, New York, August 2006.
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Fire Island, Barrier Beach
Davis Park
Democrat Point
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L.I. Manmade Beach Structures
1) Jetty – keep inlets open
2) Groin – collect sand (large beach)
*BIG impact on the beach erosion rates.
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Jetties
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Jetty
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Picture taken by Kory Gately
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Groin
Beach
Long Shore Current Direction
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Groin
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What direction is the longshore current moving?
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What direction is the longshore current moving?
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Coastal Erosion
• http://www.youtube.com/watch?v=zUh3W
eilFN4
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Final Question
What do you predict will happen to the
houses below?
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Shape of Particles Vs. Form of Erosion
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Shape of the Sediments
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A. Water Erosion Produces rounded
particle Stream or beach
erosion (smooth and rounded)
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B. Wind Erosion Produces rounded particles or particles
flattened on one side.
Appears rounded and frosted.
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C. Glaciers Produces partly rounded and scratched
particles
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A) Where bedrock is relatively soft, glacial grooves can be very deep. Glacial grooves in Devonian dolomite in Yule Creek a little east of the Yule Colorado Quarry. Gunnison County, Colorado. (All images and portions of captions from USGS).
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U- shaped valleys
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U Shaped Valley found in Greenland
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D) Gravity and Physical Weathering
Produces angular particles
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