UMass Amherst GEO-SCI 103 - Coastal Environments and Habitats (4 pages)

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Coastal Environments and Habitats



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Coastal Environments and Habitats

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Assessment and analysis of the beaches, barrier islands, spits, deltas, estuaries, salt marshes and fertile oases.


Lecture number:
20
Pages:
4
Type:
Lecture Note
School:
University of Massachusetts Amherst
Course:
Geo-Sci 103 - Intro Oceanography GenEd: PS
Edition:
1

Unformatted text preview:

GEO SCI 103 Lecture 20 Outline of Current Lecture Coastal Environments and Habitats pgs 242 245 I Beaches Barrier Islands and Spits II Deltas Estuaries Salt Marshes and Fertile Oases Current Lecture I Beaches Barrier Islands and Spits Beaches and dunes are dynamic environments that always change Beaches respond to seasonal changes in wave intensity and storm activity In the offshore area of the continental shelf seaward of the breakers the amount of sand decreases with increasing water depth This neritic sediment is a mixture of sand silt and clay A Beaches a Deposits of unconsolidated sand or gravel that accumulate along shores subject to the high energy of wave action b Beach barrier islands form when longshore drift shapes the sediments into low lying ribbons of sand that generally parallel the coastline c Spits finger like extensions of sand that jout out from shoreline parallel to direction of longshore drift d Barrier islands and spits develop along coastlines with a wide continental shelf and ample sand supply from river runoff or from erosion of coastal deposits e Food prone and easily eroded but serve as a natural buffer zone f Coastline highest elevation on the continent affected by storm waves g Shore area from low tide line to coastline that is subdivided into two different zones h Backshore flat area from high tide line to coastline i Foreshore area from the low tide shoreline to the high tide shoreline j Berm flat area of sand that accumulates just above high tide k Low tide terrace second flat area generally develops on the foreshore These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute B C D E l Beach face sharply incline surface between the berm and the low tide terrace that is cut by waves during high tide m Dunes linear ridges of unconsolidated wind blown sand that accumulates above or beyond most storm waves Low Energy environments a Marshes and



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