Ch 10-Coast 2016B.pptx - The Coast Beaches and Shoreline...

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The Coast: Beaches and Shoreline Processes CHAPTER 10
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Overview Coastal regions have distinct coastal features. Coastal region constantly changes Sea level changes affect the coast. Change primarily due to waves Erosion wearing away Deposition building up Many people live in coastal regions 80% of people in U.S. live within easy access of coast - _thumb.JPG - 148.jpg
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Coastal regions Shore between lowest tide and highest elevation affected by storm waves Coast – extends inland as far as ocean related features Coastline boundary between shore and coast Inner limit of highest storm wave action 768.jpg
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Beach Profile - Coastline Terminology Beach - wave-worked coastal sediment deposits Shore – waters edge moves up and down with tides Backshore – above high tide line Foreshore – between high and low tides Nearshore beyond low tide Offshore – beyond low tide breaker line Know this figure for Exam 3 Fig. 10.01
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Berm – above high tide at base of cliff or dune (dry) Beach face – exposed beach, berm to shoreline (wet) Longshore bars – sand bar paralleling coast Longshore trough- slightly deeper water inshore from bars Wave-cut bench – flat eroded bedrock (beneath beach) Fig. 10.01
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Composition of beaches Locally available material May be coarse or fine Boulders from local cliffs Sand or mud from rivers Volcanic material –black Precipitates - ooliths Significant biologic material at tropical beaches Example - Coral reef material, shell hash, coquina, forams etc.
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Sand movement along beach Perpendicular to shoreline (toward and away) After wave breaks, up rush of water - Swash on beach Sediment moved toward land Backwash Water returns to ocean Sediment moved away from shore
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Summer Beach Light wave activity Swash dominates sediment moved toward shore Wider beach Fair weather Summertime beach
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Winter Beach Heavy wave activity Backwash dominates sediment moved away from shore Narrower beach Sand forms offshore sand bars Stormy weather Wintertime beach
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Animation: Summer and Winter Beaches /interactiveanimations/106_SumWinBeach_TR_GO _Stu.html?tru10
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Rip currents - wave energy escaping shoreline Stream of water returning out to sea through surf zone Flows up to a few hundred meters offshore then dissipates
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Escaping rip currents Determine which direction the current is flowing by comparing where you entered the water to where you are now.
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  • Spring '14
  • Erosion, Physical oceanography, Coastal geography, Tide

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