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105-24 10-19 Coastlines-II

105-24 10-19 Coastlines-II - COASTLINES BEACHES(CONTINUED...

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COASTLINES, BEACHES (CONTINUED)
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Factors that can modify shorelines Ocean (or lake) currents Longshore drift Waves and wave refraction • Surf Tides and tidal surges Climate (storms), earthquakes (coseismic uplift, subsidence; tsunamis), mass wasting (eg., Hawaii) Coastal engineering (e.g. breakwaters, piers) Sediment supply (or lack of it) Sediment loading of continental margins in deltas Sea level changes with respect to the land (+/-)
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Sediment transport along shorelines is influenced by offshore currents, wave and surf action, and coastal engineering projects
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Engineering structures to create and preserve beaches
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Marina del Rey
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Entrance to Marina del Rey and Ballona Creek channel breakwater jetties
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erosion deposition
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Pacific Palisades coast — longshore drift toward viewer or away ? Santa Monica pier
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GEOL 105L G. DAVIS 10/19/2011
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Coastal erosion — can occur along any shoreline. Here’s some man-made evidence …
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1-02
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stacks — how do they form?
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