Coastal processes_2

Coastal processes_2 - Caused by either or both • Drop in...

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Coastal Erosion We’ll look at roles of: Major storms (storm surge) Tsunamis Ongoing processes Rising sea level Coastal development Florida
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Storm waves can cause significant erosion over short time period
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Northern California Acapulco Rocky Coastlines and Sea Cliffs
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1890 1920 1970 Historical erosion at a rocky coastline
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Wave-cut platforms So. Africa So. California
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Beaches on rocky coasts usually in protected coves
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Worldwide Sea Level is Rising Today Causes: continued melting of glacial ice and warming of seawater (causes expansion) Estimated sea level rise over next 100 years: 0.4 to 2 m Result is gradual flooding and increased coastal erosion In Northeast this could mean 15-80 m of beach erosion One consequence of sea level rise is a Submergent Coastline Distinctive features: Drowned valleys Estuaries
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Emergent Coastlines
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Unformatted text preview: Caused by either or both: • Drop in sea level • Tectonic uplift of land mass Wave-cut platform Old wave-cut platform New wave-cut platform Emergent Coastline Features • Elevated wave-cut terraces Former wave-cut terraces Development and Coastal Erosion Pressure to protect beaches and near-shore homes has resulted in coastal stabilization efforts: • Hard stabilization – engineering structures (armoring) • Soft stabilization – beach nourishment Wave energy reflected off seawall causes beach erosion in front of seawall Over time, sand beach is destroyed Erosion at Seawalls Use of “rip rap” reduces erosion Why? Ft. Lauderdale Deflected waves from sides of seawall cause erosion on both sides Before Building seawall waves After Erosion at Seawalls...
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This note was uploaded on 05/13/2011 for the course GEO 101 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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Coastal processes_2 - Caused by either or both • Drop in...

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