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Exam 3 Study Guid eCoasts and Beaches-------Quizlet: ****VERY HELPFUL QUIZLET (Use the flashcard feature): ●The Coastal region– the parts of the coastal region, starting with the coast all the way to the offshore (we looked at about 6); What wave energy does to a coastal cliff over time – erosion, how? Rivers and cliff erosion – sand to the berm; what about southern California sand supply? What’s the principal source?…○Coastal region: land adjacentto the beach and affected by the ocean (ex. Marine layer)○Coast:land extending inland as far as marine influence is seen (ex: clouds, bv climate)○Coast-line: base of cliff, think of the literal line that connects the bottom of a cliff to the sand/berm○Beach: ranges from where the waves begin breaking in ocean (“offshore”) to coast-line. yes○Wave-cut platform: flat, eroded, and shallow sand/sea floor that we are able to walk on in the shallow ocean ○Offshore: region that extends from breakers to the edge of the continental shelf○Notch: Cave-like area under coastal land due to curving waves eroding it ○Berm: dry (sandy) area at the foot of a coastal cliff○What does wave energy do to a coastal cliff over time - erosion, how? ---Crashing waves push air and water into tiny rock crevices. Repeated buildup and release of pressure can weaken and fracture the rock.○River and cliff erosion - sand to the berm:■River: Sediment on a beach has been moved for long distances by rivers or ocean currents to its present location, providing sand to the berm.■Cliff: Particles may fall from the cliff above and accumulate at the shoreline.○What about Southern California sand supply? What's the principal source?■LONGSHORE DRIFT: Movement of sediment, usually sand, along the coast, driven by wave action.Continual swash and backwash transports material sideways along the coast. ■Longshore drift occurs in 2 ways:●Wave-driven movement of sand along the exposed beach.●Current-driven movement of sand in the surfzone offshore.■Net southward transport of material along California coast exceeds 230,000 meters per year.Can someone explain the difference between the beach and the berm
The beach is the area all the way from breakers (waves, so in the water) to offshore (where depth begins to increase, no breakers, edge of continental shelf) The berm is literally the dry sand on the beach where you lie to tan, etcB●What’s the significance of the berm?…The winter time beach vs the summer time beach, why the differences?. . .○Berm is an accumulation of sediment that runs parallel to shore and marks the normal limit of sand deposition by wave action. The top of the highest berm, berm crest, is usually the highest point on a beach. It corresponds to the shoreward limit of wave action during the most recent high tides.