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Understanding Gravity-Erosion Dynamics and Mitigation Strategies

Explore the erosional forces driven by gravity, from mass movements like slumps and creeps to rockslides and mudflows. Learn how gravity influences erosion and deposition processes, affecting erosion-prone landscapes. Discover techniques to make steep slopes safe by planting vegetation and building walls or terraces. Gain insights into erosion mitigation measures for a sustainable environment.

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Understanding Gravity-Erosion Dynamics and Mitigation Strategies

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  1. Erosional Forces 7.1 Gravity

  2. Erosion and Deposition • Erosion – process that wears away surface materials and moves them from one place to another. • Major causes – gravity, glaciers, wind, and water • Deposition – dropping of sediment in a new location. • The final stage of erosion. • Erosion and Deposition by Gravity • Gravity – force of attraction that exists between all objects • Gravity causes loose materials to move down a slope. • Mass Movement – erosion that occurs due to gravitational pull on a down slope.

  3. Slump • Slump- mass movement that happens when loose materials or rock layers slip down a slope. • Happens when layers underneath can not support the rock and sediment above. • Creep • Creep – sediments that slowly inch their way down a hill. • Frequent in areas of freezing and thawing • Rockslides • Large blocks of rock break loose form a steep slope ad start tumbling • Occur in mountainous areas or where there are steep cliffs • Most often happen after heavy rains, or during earthquakes

  4. Mudflows • Occur in dry areas where there are thick layers of dry sediments • Often after a heavy rain • Erosion-Prone Land • Building on Steep Slopes • Prone to slumps because of weak sediment layers underneath. • Removal of vegetation or increasing slope speeds up erosion. • Making Steep Slopes Safe • Plant vegetation • Build walls or terraces • Can only slow erosion, never eliminate Pg. 189 1-4

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