Chapter 20-Coastal Processes and Terrain

Chapter 20-Coastal Processes and Terrain - and sand...

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Coastal Processes and Terrain
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Outline Impact of Waves and Currents Coastal Processes Coastal Landforms
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Impact of Waves and Currents Currents are large volume of water moving horizontally Waves are undulations in the surface layer of water bodies Tides are rhythmatic oscillations causing fluctuations/bulges in sea level regularly Waves erode, currents deposit Landforms are made by waves
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Coastal Processes Coastline is interface of hydrospher, lithosphere, atmosphere Wind action very influential Tides, diastrophism, tectonics, continental Ice sheets may have influence Shore shaping forces are: 1. Changes in water level 2. Tides 3. Waves 4. Currents 5. Streamflow 6. Ice push 7. Organic secretions There is also chemical change
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Coastal sediment transport Beach Drifting: Zigzag movement of sand by waves Costal deposition takes place in shoreline Estuary: A finger of sea projecting inlands Ria Shoreline: Coast with many estuaries
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Coastal Landforms Beach: Loose sediment
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Unformatted text preview: and sand Backshore: Upper part not reached by waves Berm: Flat backshore beach deposited by waves Foreshore: Between high and low tides Offshore: Farther away from the shore Cliffs: cliff built from erosion of headlands Benches: Broad erosional platform Terraces: submarine deposit of sand at the outer margin of a platform Barrier islands: Long narrow sandbar Lagoons: Body of quit salt water between mainland and barrier island Spits: Linear deposit of marine sediments Fjord Coasts: Glacial trough Coral coasts Barrier Islands and Lagoons Figure 20-17 Spits Idealized Beach Profile Figure 20-14 Focus: Waves Wind generated Crest, trough, wavelength, height Amplitude Swash Backwash Tsunami Waves Figure 20-4 Development of Waves Figure 20-2 Wave Refraction Figure 20-5 Normal High Tides Figure 20-A(1) Spring and Neap Tides Figure 20-A (2 and 3)...
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This note was uploaded on 11/19/2008 for the course CJC 101 taught by Professor Brown during the Spring '07 term at Ball State.

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Chapter 20-Coastal Processes and Terrain - and sand...

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