Exam 4 Study Guide

Exam 4 Study Guide - Chapter 12 Coasts 1) Three...

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Chapter 12 Coasts 1) Three "types" of coasts: Erosional – a coast in which erosive processes exceed depositional ones Dominant processes remove material >Deposition Ex: Straight shores, Cliffs, Caves, Platforms Depositional – a coast in which processes that deposit sediment exceed erosive processes Dominant processes add material >Erosion Ex: Beaches, Deltas -Louisiana coast is erosional and depositional, but erosional has taken control. Biological - 2) Physical Drivers of coastal geomorphology - Current Sea Level (Erosional) - Waves (Erosional, Depositional) - Tides (Erosional, Depositional) - Rivers (Depositional) 3) What is the difference between Eustatic SLR and Relative Sea Level Rise (RSLR)? - Eustatic Sea Level Rise Amount of water in the basin can change Volume of the basin can change Temperature variations can expand volume - Relative Sea Level Rise Tectonic motion and subsidence or uplift can change Wind, storm surges, currents, and other water motion (land rising (California – sea level falls) or sinking (Louisiana coast – sea level rises) of coast) 4) What is equation used to compute RSLR? RSLR = Eustatic SLR + Subsidence – Uplift 5) Why is Louisiana experiencing one of highest RSLR in world? Which term in equation is largest? Land loss Compaction of clay sediments – dewatering, subsidence increases local sea level change 6) How long ago was sea level at the current height or higher? 130,000 years ago (before last ice age) 7) When was last glacial period and how low was sea level then? 18,000 years ago 8) What is the IPCC Synthesis Report 2007? Temperature Sea level Northern Hemisphere snow cover 9) Why are we concerned about a sea level rise of 20-60 cm by 2100 if it has already been that high? Because people are living on the coast.
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10) What features would you expect to find on an erosional coast? (think of Australia or California) Wave-cut platform Original land surface Sea cliff Notch eroded by waves Exposed beach Sea arch Sea cave Sea Stack Headland Blowhole Natural rock bridges Tall stacks 11) What features would you expect to find on a depositional coast? Dunes Backshore Berm Foreshore Longshore trough Longshore bar Beaches Accumulations of loose particles Bay Sand spit Lagoon Bay mouth bar Inlet Barrier island Tombolo Sea island 12) Major causes of wetland and barrier island loss along the Louisiana coast over last 3- 4 decades - natural and anthropogenic. Sea level rise Compaction of clay sediments – dewatering, subsidence increases local sea level change! Levees which cut off natural river processes
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Exam 4 Study Guide - Chapter 12 Coasts 1) Three...

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