MICHIGAN BEACHES ventifacts Rocks smoothed from wind erosion Angular Smooth on 1-2 sides.

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Presentation transcript:

MICHIGAN BEACHES

ventifacts Rocks smoothed from wind erosion Angular Smooth on 1-2 sides

Formation of Dunes Sand supply –glaciers (MI) prevailing wind –westerly blockade –moraines (MI)

Michigan Dunes Form on the EAST side of Of the Great Lakes

DUNE FORMATION

Pinery

Ludington

Sleeping Bear

Sleeping Bear Sand Dunes Perched dune On top of a moraine

The Sleeping Bear

Long ago, in the land that is today Wisconsin, Mother Bear and her two cubs were driven into Lake Michigan by a raging forest fire. The cubs swam strongly but the distance and the water proved too much for them. They fell further and further behind and ultimately slipped beneath the waves. When Mother Bear reached the Michigan shore, she climbed to the top of a bluff and peered back across the water, searching vainly for her cubs. The Great Spirit saw her and took pity on her plight. He raised North and South Manitou Islands to mark the place where her cubs vanished and laid a slumber upon Mother Bear. -Ojibway Indian Legend

1995 slide

Silver Lake

SILVER LAKE

Dune Erosion Due to –lack of plants/trees –human activity –bad weather

Dune erosion Which direction will this dune move? How to stabilize this dune? windward leeward wind

You can help protect the dunes by: staying on paths, not littering, by leaving plants and wildlife in place

BARCHAN DUNES (overhead view)

Dune sand Abrasion –Creates “frosted grains” –angular mainly quartz –hard –Plentiful

Dune sand : angular pieces of…

Sagutuck, MI

Ogden Dunes. IN Lake MI 1986

Lake Erie House

Loess Wind blown dust Yellowish

WAVE EROSION

CAPE HATTERAS LIGHTHOUSE

Lake Michigan

Rip-rap

Lake Michigan Lakeshore Drive

1 YEAR AFTER $20 MILL. BEACH NOURISHMENT Upham Beach, FL

Save my beach! nts_programs/EarthEnvironmentalSciences/ EarthEnvironmentalSciences/Educational% 20Materials/Documents/elearning/module1 4swf.swfhttp:// nts_programs/EarthEnvironmentalSciences/ EarthEnvironmentalSciences/Educational% 20Materials/Documents/elearning/module1 4swf.swf