GEOL 108 - Crises of a PlanetLab 7 - Coastal Studies

Oct. 16 - 19, 2012

Department of Earth Sciences

Department of Earth Sciences

REVIEW | 2

QUIZ 5 REVIEW

4. Do the following substances fit the definition of a mineral? If no, explain why not.

Pearl, ice, silver, granite

What is mineral luster?

Bonus: What recent Black Keys song has a mineral in its title and what’s the chemical formula of that mineral?

Gold (Au) on The Ceiling

http://www.flickr.com/photos/francis-foley/6250425510/sizes/l/in/photostream/

Department of Earth Sciences

COASTAL STUDIES | 3

LAB 7 - Coastal Studies

Department of Earth Sciences

COASTAL STUDIES | 4

SHORELINE EROSION

• Shoreline erosion depends on factors such as:− Rock type/hardness− Geometry of shoreline (e.g. lagoons are protected)− Wind direction, intensity, and currents− Vegetation cover

Left: Green sand beach in Hawaii

Right: South Point, just a

couple km away

Department of Earth Sciences

COASTAL STUDIES | 5

SHORELINE EROSIONWave cut notches Sea arches and stacks

Above: Wave cut notches in Hawaii.Top right: sea stack formationLower right: Holei sea arch in Volcanoes National Park.

http://www.flickr.com/photos/23679420@N00/5215649472/

Department of Earth Sciences

COASTAL STUDIES | 6

SHORELINE EROSION

• Erosion creates loose sediment

Above: Oblique wave action moves sediment along a shoreline. When the shoreline moves inland a sandbar known as a spit is formed. Curved spits are called hooks.

Department of Earth Sciences

COASTAL STUDIES | 7

SHORELINE DANGERS• Hurricanes

− Wind direction varies in different parts of the hurricane.− Storm surge more hazardous than high winds

• Tsunamis