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coastal - part1 - Part of Chapter 9 and all of 25 and 30...

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Coastal Processes and Landforms Unit Outline: Defining the coastal environment Sea level Coastal system actions Shorelines of emergence and erosion Depositional landforms Coastal wetlands Deltas Corals Part of Chapter 9 and all of Chapter 20 23, 25, and 30 March People and the Environment The Sumatra Earthquake and Tsunami (p. 594) Focus Bleaching of Coral Reefs (p. 607) 1
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Coastal Environment Figure 20-15 Backshore – upper part of beach; landward of high-water line Berm – wave-deposited sediment platforms Foreshore – covered and uncovered with tides Offshore – always underwater 2
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Sea Level Changes may result from… Changing elevation of land Tectonic Subsidence Glacial isostasy Changing water volumes (eustatic) ° resulting from changing volumes of glaciers and thermal expansion of water FYI: from 1993- 2003: 1.6 mm inc. from thermal 1.2 mm inc. from glacial FYI: Some studies suggest a 80 m rise in SL if all glaciers melted (mostly from E. Antarctic ice sheet) 3
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Sea Level: Changing Land Elevation Tectonic Rapid uplift or subsidence of coast 9.2 magnitude Good Friday Earthquake FYI: Intertidal platform uplifted 38 feet in some areas and fell 7.5 feet in other places 4 4
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Sea Level: Changing Land Elevation Subsidence Extraction of fluids in coastal regions Soil compaction Especially an issue in US Gulf Coast http://www.ngs.noaa.gov/News/Louisia na/27 5 5
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Sea Level: Changing Land Elevation Glacial Isostasy Weight of ice deforms the mantle Masselink and Hughes, 2003; From Allen, 1997 h = height ρ = density w0 = maximum deflection of land i = ice sheet m = mantle c = crust 6
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Glacial Isostasy: Calculating postglacial rebound Isostatic balance equation Maximum deflection of land is equal to a quarter of the ice sheet thickness Sea Level: Changing Land Elevation i h w 24 . 0 0 = 7
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Sea Level Change L-L Fu, JPL ~100 million lives are potentially impacted by a one meter increase in sea level 8
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Sea Level Change NOAA's USA SL tren
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