1Coastal Processes…the dynamic natural processes in coastal environments (including Great Lakes!) and natural responses to human intervention. Flat sandy beach Rugged rocky coastCoastal classification•Erosionalvs depositional coasts– Erosional: shoreline is moving landward•land influences: stream erosion, abrasion from wind-driven material, freeze/thaw of water in cracks, plant roots, glacial activity, rainfall, dissolution from soil acids, slumping•sea influences: waves, organisms, sediment in water– rate of erosion depends on:•hardness of rocks•range of tides Attack from the sea is by waves and currents. On high-energy shores, the continuous onslaught of waves does most of the erosional work, with currents distributing the results of the waves’ labor.Erosional features formed by waves:•Wave-cut cliffs •Wave-cut platform •Sea arches •Sea stacks •Several mechanical and chemical effects produce erosion of rocky shorelines by waves-Depends on the geology of the coastline, nature of wave attack, long-term changes in sea-level, tidal ranges, etc. Fig. 12-4a, p. 319
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