Hk coast
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Hk coast

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    Hk coast Hk coast Presentation Transcript

    • COAST海岸
    • Where is erosion active?• Long fetch• Headland – wave energy concentrates• Line of weakness on rocks• Deep water• Destructive waves
    • Short fetch Long fetch
    • Waves• Swash - Water moves up the beach• Backwash - Water moves down from the beach
    • Wave erosion
    • Erosion on exposed coasts
    • What are coastal erosion features?• Cave• Geo• Arch• Stack• Platform
    • Platform• Ping Chau• Cliff• Platform
    • Wave Cut Platform• Cliff• Platform
    • Notch•Wavesundercut thecliff•Hydraulicaction,abrasion•Notchformed atthe base
    • FormationNotch collapsesCliff retreatsLeave a rocky platform behind
    • Caves on Basalt Island
    • Geo and cliff• A small inlet• Steep slopes on both sides
    • Geo on Yuen Kong• Inlet• Cliff on both sides
    • Geo on Wan Lan Island
    • Formation• Waves attacks base of cliff• Erosion along lines of weakness• Notch is formed• Then a cave along the line of weakness• Cave collapses
    • Arch on Tiu Chung Chau
    • Tiu Chung Chau
    • Arch on Basalt Island
    • Coastal Erosion
    • Formation• Line of weakness cutting across a headland• Two caves formed on the same line• Meet and join together or• Cave formed on a line and extends to the other side
    • Stack
    • Stack on Tai A Chau
    • Formation• Two caves meet and the roof collapses• Two geos meet
    • Transportation• Long shore drift• This happens when the prevailing wind is not perpendicular to the coastline.• Grains move up the shore obliquely• Then move down under gravity• Net movement
    • Beach / Long shore driftWind direction
    • Favourable conditions of deposition• Erosion / delta provides sediment• Sheltered coast• Shallow water offshore• Constructive waves• Vegetation on the coast
    • Spit at Pui O
    • Spit
    • Spit
    • Tombolo: spit between twoislands / an island and mainland
    • Tombolo on Soko Islands
    • Tombolo on Sha Chau