GLY 4734. Societal Reasons Hazard/Event-based Reasons Geologic Reasons Why is the coast important to study?

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Presentation transcript:

GLY 4734

Societal Reasons Hazard/Event-based Reasons Geologic Reasons Why is the coast important to study?

Societal Reasons - Coastal Population 30 coastal states contain 62% of US population and 12/13 largest cities 53% of US pop. lives w/in 50 miles of the shore (83% in Australia) in 1973: 440,000 km of global coastline / 3.3 billion humans = 13 cm each today: 440,000 km of global coastline / 6.7 billion humans = 6.5 cm each

Sand Key, FL Development along our coastlines continues to expand Societal Reasons – Coastal Development

Populations Pressures Transportation Safety Infrastructure Alsea Bay, Waldport, OR - Photo credit: Paul Komar Societal Reasons – Coastal Infrastructure

Concept of dynamic equilibrium Construction of Aswan Dam has shut off sediment supply Result: rapid coastal recession rates = m/yr Societal Reasons - Agricultural Example: Nile Delta

Coastal Hazards - Hurricanes

Dauphine Island, Alabama LIDAR data - newish technology Hazards/Climate Reasons – Example: Hurricanes Ivan and Katrina

LIDAR surveys - Dauphine Island, Gulf Coast of Alabama Hazards/Climate Reasons – Landform changes caused by the storm events

Hazards/Climate Reasons - Sea Level Rise Gainesville

Hazards/Climate Reasons - Sea Cliff Retreat Examples

Biota, Habitat, Ecological Reasons Uplift Sea Level Change Wave Transformation Wave Energy Imparted to Coast Lithologic Response Offshore Wave Climate Beaches

Geologic Reasons – Generation of Stratigraphy Uplift Sea Level Change Wave Transformation Wave Energy Imparted to Coast Lithologic Response Offshore Wave Climate Beaches

History of Science of Coastal Geomorphology Uplift Sea Level Change Wave Transformation Wave Energy Imparted to Coast Lithologic Response Offshore Wave Climate Beaches Greeks (Herodotus) and the Nile 'delta' da Vinci and the Pontine Marshes in Italy - 15th century Captain Cook's voyages shed light on many coastal reaches worldwide Early geologists (Hutton, Lyell) recognized the coast as a modern depositional environment responsible for sedimentary rock generation. Early geomorphologists (de Beaumont, Huxley) identified the link between process and form along the coast. Darwin theorized on the origins and evolution of reefs and atolls. Even Grove Karl Gilbert interpreted abandoned terraces in Utah to testify to the presence of Pleistocene lakes in the western U.S. Early 20th century: Douglas Johnson's application of William Morris Davis's "geographical cycle" -New England coast World War II and in the Cold War era which followed - scientists at Scripps Institution of Oceanography (Sverdrup, Munk, Shepard, and Inman)

In-Class Exercise Name and where are you “from”? What coast are you most familiar with or are you currently interested in? What are some issues there that grab your attention? During the semester, consider how each topic we cover affects your coast (i.e. tectonics, wave climate, sediment supply/local rivers, population/human infrastructure, hazard vulnerability). I'll start with an example...

South-Central Alaska