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105_16-shorelines_part_2 - Erosional coastal landforms Sea...

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Unformatted text preview: Erosional coastal landforms Sea Sea Caves and arches form – Headland narrows arch cave Erosional coastal landforms Sea Sea Stack forms – Headland removed Sea stack Erosional coastal landforms Sea Sea Caves Sea caves on Cape Kildare, Prince Edwards Island, Canada Sea stacks 1 Coastal management Rising Rising sea level Coastal Coastal erosion – protection – replenishment of beaches Storm Storm surge Sea stacks, Faeroe Islands Fire Island, NY 2 Coastal management Groins: Groins: Miami Beach Coastal management Groins Groins Coastal management Groins: Groins: Cape May, New Jersey Jetty Jetty Coastal management Coastal management Jetty: Jetty: Miami Beach Coastal management Breakwaters Breakwaters – Walls designed to create wave-free zone wave- Santa Barbara Harbor, 1931 3 Coastal management Breakwaters Breakwaters – Walls designed to create wave-free zone wave- Protection of coasts Seawall Seawall (New Jersey) Santa Barbara Harbor, 1977 Protection of coasts Seawall Seawall (Louisiana) HumanHuman-induced Coastal Modifications Beaches respond to all changes by trying to achieve equilibrium between deposition and erosion again. Types of coast Drowned Drowned (Submergent) Glacial Glacial activity: fjord Hardangerfjord, Norway 4 Types of coast Uplifted Uplifted (emergent) coasts – raised beaches, marine terraces South Louisiana marshes Tectonic Tectonic Uplift Uplifted marine terraces Uplifted marine terraces Types of coasts Depositional Depositional – Gently sloping plains – Deltas, barrier islands, etc. – Atlantic and Gulf coasts 550 Million tons sediment/year: Mississippi delta 5 Types of coasts Organic Organic – Reefs – Mangroves Bora Bora Bora, French Polynesia Types of Coasts Organic Organic Coasts – Reefs – Mangroves: protruding roots of mangrove trees trap sediment Great Barrier Reef, Australia Mangrove Swamps Waves, Beaches and Coasts Chapter 16 6 ...
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