Chapter08 - Chapter 8: Barrier Systems General Description...

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1 Chapter 8: Barrier Systems •General Description of Morphology •Barrier Types •Evolution (Prograding, Retrograding, or Aggrading) •Barrier Stratigraphy •LI Barrier System Physical Description •Wave built accumulations of sand •Waves and Winds sustain their evolution •Linear features, parallel to coast •Occur in groups or chains Barrier Systems Beach Barrier Interior Landward Margin Beach: dynamic, evolution dependant on winds, waves and tides Barrier Interior: sand dunes, dune lines, vegetated beach ridges, brackish ponds. Landward Margin: intertidal sand/mud flats, salt marsh, overwash splays, transitions into bay, lagoon or tidal creek Distribution and Coastal Setting •Comprise ~15% of the worlds coastline •Found on every continent (except Antarctica), geologic- climatologic setting •Amero-trailing edge coasts •Mid-low latitudes, micro-meso tidal environments Barrier Distribution Microtidal: < 2 m Mesotidal: 2 – 4 m Macrotidal: > 4 m
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2 Amero-Trailing Edge Coasts Sediment supply Shelf width US east coast barrier chains extend 3100 km Slow erosion Appalachian Mnts Gulf coast (1600 km) Sediment supply is low (short steep rivers) Shelves tend to be narrow (high wave energy) Sediment is often transported to ocean basins Afro-Neo Trailing Edge Coasts Lack of sediment Lack of organized drainage Types of Barriers Barrier Spits Recurved spits Stony Brook Harbor, Long Beach
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Chapter08 - Chapter 8: Barrier Systems General Description...

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