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Coastal case studies

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Presentation showing coastal management and plant species found on the sand dunes in the coastal regions of Praa Sands and Porthleven, Cornwall

Presentation showing coastal management and plant species found on the sand dunes in the coastal regions of Praa Sands and Porthleven, Cornwall

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Transcript

  • 1. Coastal case studies
    PRAA SANDS AND PORTHLEVEN CORNWALL
  • 2. PRAA SANDS
    WOODEN STEPS TO PREVENT EROSION OF THE CLIFFS AND DUNES
    ANCIENT PEAT BED
    MARRAM GRASS –A XEROPHYTE THAT THRIVES UNDER CONDITIONS OF SHIFTING SANDS AND HIGH WINDS
  • 3. Blowouts are sandy depressions in a sand dune ecosystem (psammosere) caused by the removal of sediments by wind A blowout forms when a patch of protective vegetation is lost, Causes of vegetation loss include extended droughts, fire, trampling by humans, cattle, horses, etc.
    SAND DUNES AND BLOWOUTS
  • 4. COASTAL MANAGEMENT
    SOME MEASURES TO PREVENT FURTHER EROSION OF THE SAND DUNES HAVE BEEN UNDERTAKEN
  • 5. SEA SPURGE
    PLANT SUCCESSION INCLUDING HEATHER HEATHS AND GORSES TAKES PLACE. WHEN THE SOIL IS BOUND BY THE MARRAM GRASS.
    THESE PLANTS TOO ARE ADAPTED TO THE LOW SOIL WATER CONTENT AND HAVE SMALL, PRICKLY LEAVES WHICH REDUCE TRANSPIRATION.
  • 6. THE MARRAM GRASSES ADD NITROGEN TO THE SOIL, MEANING OTHER, LESS HARDY PLANTS CAN THEN COLONIZE THE DUNES.
    TREE MALLOW
  • 7. FENCING AND PARTIONING TO PROTECT AGAINST FURTHER EROSION
    RIPRAP— IS ROCK OR OTHER MATERIAL USED TO ARMOUR SHORELINES RIPRAP WORKS BY ABSORBING AND DEFLECTING THE IMPACT OF A WAVE BEFORE THE WAVE REACHES THE DEFENDED STRUCTURE.
  • 8. CLOSE UP OF GABION
    GABION IN SITU TO MANAGE EROSION
  • 9. SEA WALL WITH DRAINAGE HOLES
    AND
    REVETMENT REINFORCED WITH
    STEEL
  • 10. RIP RAP AND FENCING TO PREVENT EROSION
    VEGETATION TO BIND SOILS
  • 11. CLOSE UP OF COASTAL EROSION
    VEGETATION BINDING SOIL TO PREVENT EROSION AS WELL AS THE RIP RAP (BOULDERS).
  • 12. WAVE CUT PLATFORM
    RIP RAP TO ABSORB WAVE ENERGY
  • 13. GEOLOGY AT PRAA SANDS (REGIONALLY IMPORTANT GEOLOGICAL / GEOMORPHICAL SITE) ALSO SSSI (SITE OF SPECIAL SCIENTIFIC INTEREST).
    RHYOLITE DYKE CONTACT IN METASEDIMENTS, PRAA SANDS, CORNWALL.
  • 14. ADIT FORMED BY EROSION
    EROSIONAL LANDFORMS AT PRAA SANDS
    CAVES
  • 15. HOE POINT SEA STACK AT PRAA SANDS
    SECTION OF ROCKY BEACH
  • 16. GRANITE PIER AT PORTHLEVEN
    BEACH STRETCHING OUT TOWARDS LOE BAR
  • 17. THE COST EFFECTIVE SEA WALL CONSTRUCTED AT PORTHLEVEN TO PROTECT THE HOUSES AND THE ROAD BEHIND THE COAST
    CURVED SEA WALLS REFLECT THE ENERGY OF THE WAVES BACK TO THE SEA.