coastal processes

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  • Coasts
    • coastal processes
      • hydraulic power
        • water is forced into joints in the cliff which causes intense presure or weakening of the cliff
      • corrasion
        • this is the wearing away of the cliff by materials carried by the waves hitting the rock and rubbing it down like sand paper
      • attrition
        • were large boulders or pebbles roll into each other in the 'surf zone' and break down into smaller sized pieces.
      • solution
        • were a chemical reaction between the sea and the cliff takes place.sea dissolves down the rock
    • waves
      • destructive
        • these are formed by local storms,close to the coast. they destroy the beaach because they have a large back wash so they pull sediment down the beach
      • constructive
        • these waves surge up the beach. they carries large amounts of sediment up the beach because they have a large swash. they are formed by distant storms.
      • fetch
        • this is the distance over  which the waves build up.
    • mass movement
      • slumping
        • rotational slip of saturated soil and weak rock along a curved surface
      • debris slide
        • blocks of large rock slide down hill sides or mountains.
      • rock fall
        • fragments of rock break away from the cliff face. often due to freeze thaw weathering
      • mud flow
        • saturated soil and weak rock flows down a slope
    • transportation
      • long shore  drift
        • this is caused by the prevaling wind blowing waves onto a beach at an angle . the swash from the waves carries sediment up the beach and back wash brings it straight down  the beach. the net movement of the sediment is down the beach useualy in the direction of the prevaling winfd
      • traction
        • where large boulders and rock roll along the bottom of the  sea
      • saltation
        • smaller rocks are lighter and can be moved easlier so these 'bob' along the bottom of the sea
      • solution
        • particles have dissolved in the sea water and are carried in solution.
      • suspention
        • small fine particles of sand and rock are even smaller and float in suspention

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