coasts - Types of Depositional Systems Types marine ocean,...

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Unformatted text preview: Types of Depositional Systems Types marine ocean, sea terrestrial land transitional part land, part ocean Coastal Depositional Systems Coastal – – – form in proximity to shorelines geographically narrow, geologically important fluid flow transport and deposition • • • • surface waves tidal waves (not tsunami!) fluvial input wind – grain-size decreases with water depth, sort of... grain-size – onshore, offshore & longshore sediment transport onshore, important important – net sediment input often leads to progradational net progradational geometries – important for tracking sea-level changes Waves Waves wave: a disturbance that propagates • wavelength (λ) • period = 1/f • wave height • wave base = λ/2 wave Surface Wave Motion Surface Surface Waves Surface Surface Waves Surface Shoaling Waves Shoaling Shoaling Waves Shoaling H/L: >1/7 Shoaling Waves Shoaling Coastal Profile Coastal Coastal Geomorphology Coastal Reinson, 1984 Coastal Morphology Coastal Coastal Morphology Coastal Barrier Island Barrier Washover Fans Washover Washover Fan Washover Storm Surge Surge Storm Surge: James River, VA Storm Walther’s ‘Law’ Walther’s Walther’s ‘Law’ Walther’s Walther’s ‘Law’ Walther’s Walther’s ‘Law’ Walther’s Walther’s ‘Law’ Walther’s Walther’s ‘Law’ Walther’s Walther’s ‘Law’ Walther’s Walther’s ‘Law’ Walther’s Walther’s ‘Law’ Walther’s Lateral Variations Lateral Lateral Variations Lateral shallowing Lateral Variations Lateral deepening shallowing Lateral Variations Lateral shallowing deepening shallowing Walther’s ‘Law’ Walther’s K J I H G F E D C B A Walther’s ‘Law’ Walther’s shallowing rapid deepening shallowing deepening Tides Tides • Tides are sea-level changes caused by Tides variations in gravitational acceleration caused by periodic fluctuations in proximity of the Moon and Sun to a particular place on Earth Moon • Lunar processes dominant Lunar • There are three periodicities: – – – diurnal & semi-diurnal (Earth rotation) spring vs. neap (Lunar revolution) seasonal (Earth revolution) Gravitational Attraction Gravitational Earth Rotation (Diurnal/Semi-Diurnal) Earth HIGH 12AM Earth Rotation Earth LOW 6 AM Earth Rotation Earth HIGH 12PM Earth Rotation Earth LOW 6PM Earth Rotation Earth HIGH 12AM Earth Rotation Earth Lunar Revolution Lunar SPRING DAY 1 Lunar Revolution Lunar NEAP DAY 7 Lunar Revolution Lunar SPRING DAY 14 Lunar Revolution Lunar NEAP DAY 21 Lunar Revolution Lunar SPRING DAY 28 Lunar Revolution Lunar Earth Revolution Earth Earth Revolution: Yucatan Peninsula Earth ...
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This note was uploaded on 06/03/2011 for the course GEOL 201 taught by Professor Baruah during the Fall '10 term at South Carolina.

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