9 - Waves • Are generated by wind • Erode shorelines...

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Fluvial Landscapes The Geographic Cycle - or Cycle of Erosion – is a model for stream erosion and landscape development. This theory suggests that landscapes go through stages of development and that the rejuvenation of landscapes arises from tectonic uplift of the land. The geographic cycle was first described by William Morris Davis, a prominent geographer and geomorphologist of the late 19th early 20th century Landscapes range from mountain regions of steep slopes and rugged peaks to regions of gentle hills and valleys to flat plains. Peneplain – the final stage in fluvial or stream erosion. After streams have reached base level, lateral erosion is dominant – as the streams erode the highland areas between them. Chapter 17 Coastal Processes and Landforms The Work of Waves and Tides Types of Coastlines The Work of Waves Waves are the most important agent shaping coastal landforms
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Unformatted text preview: Waves: • Are generated by wind • Erode shorelines • Move sediment Bays : bodies of water sheltered from strong wave action Estuary : where a river empties into a bay Shoreline: shifting line of contact between water and land Coastline: zone in which coastal processes operate or have a strong influence The Work of Waves • Waves do not lose much energy as they travel across the deep ocean. • When a wave reaches the beach, the drag of the bottom slows and steepens it • The wave leans forward, and eventually breaks, creating a breaker • This powerful “swash” moves sand and gravel on the beach landward. • The return flow or “backwash” pours down the beach creating an undercurrent (undertow). This force can carry a person seaward beneath the next oncoming breaker • The backwash carries sand and gravel seaward, completing the wave cycle....
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