Transcript Chapter 15 Section 3

Chapter 15 Section 3
Erosion and Deposition
Ryan, Jack, Brooke, Jordan, and Becca
Majestic Ocean Sounds
Erosional Features
Wave Cut Cliffs- a feature of the ocean that forms from
the cutting motion of the surf against land on the coast
Wave Cut Platform- an ocean form that is composed of
flat, bench-like surfaces that were left behind from
receding cliffs
o Marine Terraces are a type of wave cut platform
that are uplifted
Erosional Features
Sea Arches: an ocean
feature that forms when a
headland is eroded and two
caves from opposite sides
join together
Sea Stacks: an ocean
feature that forms when the
top, or roof, of a sea arch
collapses
Depositional Features
•
Some depositional features originate when sediment is
displaced by beach drift and longshore currents
 Spits-elongated sand ridges that project from
the land into the mouth of an adjacent bay
 Baymouth Bars-sandbars that cross a bay
entirely
 Tombolos-sand ridges that connect an island to
the mainland or to a different island
Depositional Features
• swa
Sea Spit off Turtle Island, Taiwan
Tombolo in California
Barrier Islands:
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These are low ridges of sand parallel to the coast at
distances from 3 to 30 kilometers.
Most are from 1 to 5 kilometers wide and between 15
and 30 kilometers long.
Barrier Islands are formed in a few ways. Some were
originated as spits and were separated from the
mainland by wave erosion.
Others were formed when turbulent waters in the line
of breakers piled up sand that had been scraped from
the bottom.
Barrier Islands:
A marvelous picture of a barrier island
Shoreline Erosional Problems
1) Bursts of accelerated erosion
* impact the natural evolution of the coast
*impact the lives of the people living on the
coast
-huge amounts of money are
spent annually in order to repair erosional
damage and to control erosion
•
These five factors influence the amount of
destruction caused by shoreline erosion:
1. the proximity of a coast to sediment-laden
rivers
2. the degree of tectonic activity
3. the topography and composition of the land
4. prevailing winds and weather patterns
5. the configuration of the coastline and
nearshore areas
Hard Stabilization
Hard Stabilization is any form of man made
structure built to protect a coast or to
prevent the movement of sand along a
beach. Examples include groins,
breakwaters, and seawalls
Types of Hard Stabilization
Groin- a barrier built at a 90 degree angle to
the beach to catch sand that is moving
parallel to the shore
Breakwater- a structure guarding a nearshore
area from breaking waves
Seawall- a barrier created to stop waves from
reaching the area behind the wall. Its
purpose is to defend property from the
damaging power of breaking waves
•
Shoreline Erosional Problems
Alternatives to Hard Stabilization
o
Beach nourishment; is done by the addition of sand
to replenish beaches that are eroding
Erosion Video
Works Cited
Bali Sea Arch. N.d. Photograph. Natural Arches. Web. 26 May 2013. <http://www.naturalarches.org/galleryIndonesia-Bali.htm>.
Barrier Island. N.d. Photograph. Futurity. Web. 26 May 2013. <http://www.futurity.org/earth-environment/barrierislands-more-abundant/>.
Baymouth Bar. N.d. Photograph. So. California. Coastal Processes. Web. 26 May 2013.
<http://www.greatneck.k12.ny.us/GNPS/SHS/dept/science/tuomey/Erosion_Deposition_Landscapes>.
Before and After Miami Beach Nourishment Program. N.d. Photograph. Rakontur. Web. 26 May 2013.
<http://www.rakontur.com/journal/2008/9/4/working-on-the-1980s-miami-photo-book.html –>.
Erosion and Landforms Movie. YouTube. Dianarabstejnek, 11 Apr. 2011. Web. 26 May 2013.
<https://www.youtube.com/watch?v=fztT507KivI&feature=player_embedded>.
Into the Blue Ocean Sounds:Underwater Sound Water Sounds Nature Sounds Music Sleep Music Relax.
YouTube. Meditationrelaxclub, 11 Oct. 2012. Web. 26 May 2013.
<https://www.youtube.com/watch?feature=player_embedded&v=vm9_1v-1eKc>.
Sea Spit. N.d. Photograph. Turtle Island, Taiwan. Dreamstime. Web. 26 May 2013.
<http://www.dreamstime.com/stock-image-aerial-view-sea-spit-image11714961>.
Stack. N.d. Photograph. Torre Sant'Andrea, Southern Italy. Wikipedia-The Free Encyclopedia. Web. 26 May 2013.
<http://en.wikipedia.org/wiki/Stack_(geology)>.
Tarbuck, Edward J., and Frederick K. Lutgens. "The Dynamic Ocean." Earth Science. 11th ed. Upper Saddle
River, NJ: Prentice Hall, 1997. N. pag. Print.
Tombolo California. N.d. Photograph. Tombolo California. Web. 26 May 2013.
<http://geology.about.com/od/structureslandforms/ig/Depositional-Landforms/tombolo.htm –>.