Depositions Landforms - Sand dunes

• Sand dunes


  Small ridges or hills of sand found at the top of a beach, above the usual maximum reach of the waves.
• Psammosere


  An ecological succession that began life on newly exposed coastal sand
• Climax vegetation


  The dominant mix of vegetation species that characterise an environment given time for colonisation to occur and reach stability
• Plant succession


  A directional change in the types of plant species that occupy a given area through time.
• Beach at low tide

  Sand accumulates on the beach from longshore drift., it dries out and becomes lighter and prevailing wind moves the sand by saltation. soon strong winds will carry it longer distances.
• Embryo dunes


  Sand accumulates as it meets and obstruction, may disappear quickly as they're attacked by strong winds.
• Fore dunes


  Colonised by plants, which helps traps sand and increases in height to 5m
• Yellow dune


  Shows greater variations of plants. humus traps nutrients and water when plants die and there's more shelter. 80% of sand surface is vegetated
• Grey dune


  More stable, sheltered by wind, 100% covered y vegetation like small shrubs
• Dune slack


  Water table reaches the surface causing water logging and surface water. Plants are adapted to damp conditions like cotton grass.
• Mature dune


  Develop strong soil for trees, an oak climax vegetation may develop