March 14_ch10 (1)

March 14_ch10 (1) - March 14, 2012 Chapter 10: waves,...

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March 14, 2012 Chapter 10: waves, currents, coastlines Longshore/Beach drifting o A beach is a landform: a river of sand that is always being transported along the beach, moves b/c of waves o Wind = the main cause of waves (esp. for trade/westerly winds) o Waves generally come in at an angle Don’t retreat back the same direction they came in, little loop which moves the sand o Sand normally comes from the breakdown of rock on landmasses Transported out to the coastline by streams, waves collect it and transport the sand down shore If the streams cease to supply sand then beaches can become eroded Dams can reduce sediment deposit out to the sea Sedimentary features: o Tombolo: sand bar that connects island to the mainland o Lagoon: when a bay is fully inclosed by baymouth bar o Baymouth bar: sand deposits that go all the way across the bay o Spit: beginnings of sand that starts to enclose the bay, eventually can become a baymouth bar where it connects o Barrier Islands: on the east coast of the US (NC, MD), made up of sand, occur
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March 14_ch10 (1) - March 14, 2012 Chapter 10: waves,...

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