Cliffs and wc platforms
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Cliffs and wc platforms

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  • A mountain pass (also gap, notch) is a route through a mountain range or over a ridge. Undercut: cut or wear Away the part tts below the cliff

Cliffs and wc platforms Presentation Transcript

  • 1. Coasts Agents Coastal shaping Coastal protection Coasts processes measures1. Waves2. Tides Erosion Transportation Deposition Forms Forms Forms3. Currents Spits Beaches Spits Tombolos 1. Cliffs & Wave cut platforms 2. Headlands & Bays 1
  • 2. Definitions • Cliffs • A steep rock face along a coast. Can tilt forwards or backwards. • Wave cut platform/ shore platform • A gentle sloping platform found at the base of the cliff2
  • 3. Formation of Cliffs and Wave cut platforms• Waves erodes a coast by hydraulic action and abrasion• Erosion process attacks lines of weaknesses (A)• Notch ( narrow pass/cut) will be deepened to produce a cave• Undercutting of the cave results in an overhanging cliff (B)• Overhanging cliff may collapse (C)• Cliff retreats further inland with more erosion• The base of the cliff forms a gentle platform known as the wave cut platform (D) 3
  • 4. DefinitionsHeadlandsExtensions of bedrock jutting out into the seausually with a cliff. Resistant towards erosion.BaysBody of water connected to the seas due tosurrounding land blocking off some waves 4
  • 5. Formation of Headlands and Bays• Waves approach the coasts comprising of alternate strips of resistant hard rocks and less resistant soft rocks.• The less resistant rocks will be eroded faster than the more resistant hard rocks. (A)• When the softer rocks are eroded away, bays are formed.• The remaining hard rocks extending into the sea are known as headlands. (B) 5
  • 6. Overview 6
  • 7. Using a labelled diagram, describe the process of longshore drift [4]• Waves reach the coast at an oblique angle creates a longshore current• The materials move in a zigzag pattern in a down drift direction ( beach drift)• The swash carries materials up the beach at the same angle as when the wave approaches the shore• As the swash dies away, the backwash and any materials carries by it return straight down the beach at right angles to the water line due to gravity.• Longshore drift = beach drift + longshore current 7
  • 8. The process by which waves are been or turned from its origin Wave refraction• Waves us ually approac h c oas t at an angle 3• But when it hits the headlands , the energy is c onc entrated and erodes the headlands• The energy is s pread out as it moves towards the bay. Res ults in depos ition of 2 s entiments at the bay- 1 forms beac hes .8