shorelinesII

shorelinesII - Physical Geology 101 33. Shorelines II (p....

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Physical Geology 101 1 33. Shorelines II (p. 545-559) Deposition Along Shorelines Waves that strike a shoreline obliquely set in motion a longshore current parallel to the shoreline. The longshore current transports eroded sediment along the coastline. The transportation of this sediment occurs by waves washing up the beach obliquely then returning directly to the sea. The swash and sediment therefore zig-zags along the beach in a process called ________________________. Even large pebbles can get moved by several hundred meters a day by longshore drift. What are the three categories of depositional features produced by the deposition of sediment carried by longshore currents? 1. _____________________ 2. _____________________ 3. _____________________ Beaches What are the main components of beach sand? ______________________ ______________________ ______________________ Beaches are constantly changing, with sediment being added and removed. In calm weather, beaches receive more sediment that they lose and get wider. During storms, beaches may lose a lot of sediment to erosion so they get thinner. Beaches may be long and continuous of they may occur as small, isolated beaches between rocky outcroppings, in which case they are called ________________________. What can be built along a shoreline to catch the sand being carried away by longshore drift and protect the beach from being eroded away? ____________________ Similar barriers built across the entrances to bays and harbors are ___________________. Spits Longshore drift carries sediment along the coastline until it reaches some sort of obstruction. For example, where a river flows into the ocean, a spit may form as ______________________________ ________________________________________ You can tell the direction of the longshore current by looking at a spit because: _____________________________________________________________________
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Physical Geology 101 2 If the spit completely covers the river mouth, it is called a ______________________. During periods of heavy river discharge or at high tide, the river may be open to the ocean through the spit, but is closed to the ocean at low tide or during low discharge periods. Sometimes, an island just offshore can get connected to the mainland by an arm of sediment deposited
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shorelinesII - Physical Geology 101 33. Shorelines II (p....

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