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Chapter 15 Section 3 Erosion and Deposition Ryan, Jack, Brooke, Jordan, and Becca.

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Presentation on theme: "Chapter 15 Section 3 Erosion and Deposition Ryan, Jack, Brooke, Jordan, and Becca."— Presentation transcript:

1 Chapter 15 Section 3 Erosion and Deposition Ryan, Jack, Brooke, Jordan, and Becca

2 Majestic Ocean Sounds

3 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

4 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

5 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

6 Depositional Features swa Sea Spit off Turtle Island, Taiwan Tombolo in California

7 Barrier Islands: 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.

8 Barrier Islands: A marvelous picture of a barrier island

9 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

10 Factors of Shoreline 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

11 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

12 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

13 Shoreline Erosional Problems Alternatives to Hard Stabilization o Beach nourishment; is done by the addition of sand to replenish beaches that are eroding o Relocation; moving damaged and/or threatened buildings out of dangerous areas

14 Erosion Video

15 Works Cited Bali Sea Arch. N.d. Photograph. Natural Arches. Web. 26 May Barrier Island. N.d. Photograph. Futurity. Web. 26 May Baymouth Bar. N.d. Photograph. So. California. Coastal Processes. Web. 26 May Before and After Miami Beach Nourishment Program. N.d. Photograph. Rakontur. Web. 26 May Erosion and Landforms Movie. YouTube. Dianarabstejnek, 11 Apr Web. 26 May Into the Blue Ocean Sounds:Underwater Sound Water Sounds Nature Sounds Music Sleep Music Relax. YouTube. Meditationrelaxclub, 11 Oct Web. 26 May Sea Spit. N.d. Photograph. Turtle Island, Taiwan. Dreamstime. Web. 26 May Stack. N.d. Photograph. Torre Sant'Andrea, Southern Italy. Wikipedia-The Free Encyclopedia. Web. 26 May Tarbuck, Edward J., and Frederick K. Lutgens. "The Dynamic Ocean." Earth Science. 11th ed. Upper Saddle River, NJ: Prentice Hall, N. pag. Print. Tombolo California. N.d. Photograph. Tombolo California. Web. 26 May


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