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Lecture

Lecture Mar 6.docx

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Department
Geography
Course
GEOG 1F91
Professor
Daryl Dagesse
Semester
Winter

Description
Mar. 6, 2014 Coastal Processes • Waves, application of Hjulstrom diagram • Wave motion • Wave action o Erosion by:  Hydraulic action  Abrasion  Corrosion (same as fluvial) o Force of erosion dependent on the type of shoreline  Low gradient (beach) dissipates energy  High gradient (bluffs) resists o Morphology of coast controls these processes  Sediment source  Shape o Net process is always to make the shoreline smoother  Erosion of headlands  Deposition across embayments  Text Fig. 17.25 o How? Wave refraction  Bending the wave • Sediment transport o How does sediment get there? o Longshore drift (Fig. 17.28) o Beach drifting • Deposition o When is sediment deposited? o Think back to Hjulstrom diagram  When water velocity slows down  Waves die down  Backwash slower than swash • Erosional features o Generally related to bluffs in unconsolidated material (glacial hill) particularly in the Great Lakes Basin o This relates to mass wasting processes
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