111-pp16 - UNIVERSITY OF SOUTH ALABAMA Last Time GY 111:...

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1 GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 16: Sedimentary Environments 3 Beaches Lecture 16: Sedimentary Environments 3 Beaches Last Time 1) Depositional Environments in general 2) Alluvial fans and their rocks 3) Meandering Rivers 4) Deltas Depositional Environments Depositional (or sedimentary) environments: Places where sediment is deposited (i.e., sediment sinks). They are numerous. Sedimentologists study sedimentary rocks to reconstruct past environments of deposition Alluvial Fans Fan-shaped deposits of siliciclastic sediment deposited at the base of mountains ± Gravel to clay sized ± Angular to sub rounded ± immature Meandering Rivers Are characterized by a distinct suite of facies distinct suite of facies and processes Oxbow lakes Levees Levees Floodplains Cut banks Cut banks Point bars Yazoo streams Yazoo streams Cutoffs Delta Morphology ht p:/ www.geology.pit .edu/ Wave-dominated River-dominated Tide-dominated
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2 Today’s Agenda Web notes 16A: Beaches Web notes 16B: Shelves Web notes 16C: Deep marine environments 1) Types of modern beaches & beach morphology 2) Waves and beach dynamics 3) Shelves (Biochemical and Chemical Rocks) 4) Reefs, atolls and oolites 5) Evaporites and evaporate basins 6) Deep Marine Environments Sedimentary Environments Part 2 Types of Beaches Types of Beaches Shoreline attached beach, NSW, Australia Barrier Island Beach, e.g., Dauphin Island, Alabama Beach Terminology
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3 Beach Terminology Shelf Beach To 150 m water depth 10 m water depth Beach Terminology Shelf Beach To 150 m water depth 10 m water depth Waves and Beach Dynamics Wind Waves Waves and Beach Dynamics Wind “swash” Waves and Beach Dynamics The origins of longshore currents and longshore drift
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4 Beach Terminology Wave base Beach Morphology Storm detritus, and good terrace development, Waihi Beach, New Zealand Storm detritus, and good terrace development, Waihi Beach, New Zealand Low tide terrace Storm detritus, and good terrace development, Waihi Beach, New Zealand Low tide terrace Low tide terrace High tide terrace Storm detritus, and good terrace development, Waihi Beach, New Zealand Low tide terrace Low tide terrace High tide terrace Dunes Dunes GY 344 (Lect 12) p. 17
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5 Swash zone, Waihi Beach, New Zealand
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This note was uploaded on 02/04/2012 for the course GLY 111 taught by Professor Haywick during the Fall '11 term at S. Alabama.

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111-pp16 - UNIVERSITY OF SOUTH ALABAMA Last Time GY 111:...

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