Coastal Management: defense against flooding and erosion Hard Engineering and Soft Engineering Measures.

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Presentation transcript:

Coastal Management: defense against flooding and erosion Hard Engineering and Soft Engineering Measures

Evaluate the effectiveness of coastal protection methods We are going on a virtual field trip to investigate the features of coastal protection in different islands of the Bahamas. What are the advantages and disadvantages of different types of protection? As we visit each site, you will need to fill in a field scorecard to rate the protection in different categories.

bahamas&hl=en&ll= , &spn= , &t=h&hnear=The+Bahamas&z=7 Map of the Bahamas Issues 700 different islands and Cays Very low lying – highest point 63 meters above sea level Hurricane risk area Many settlements and roadways are on the coast Tourism makes up more than than 50% of GDP Grand Bahama Abaco New Providence – capital city Nassau

Sea Wall at Williams Town, Grand Bahama Looking East

Looking West

Groynes on Treasure Cay in Abaco

Groyne/rock armour at Grand Lucayan Hotel, Grand Bahama &spn= , &sll= , &sspn= , &t=h&hq=grand+lucayan&radius=15000&z=18

Looking towards the hotel – you can see the last groyne/rock armour

Habitat restoration, Elbow Cay, Abaco

Gabions at Paradise Cove - snorkeling destination, Grand Bahama

Breakwater to protect Nassau harbor, New Providence &spn= , &sll= , &sspn= , &t=h&hnear=Paradise+Island&z=17

Revetment in Marsh Harbour, Abaco

Managed retreat, Gold Rock National Park, Grand Bahama Damage from Hurricane Sandy 2012

Student tasks Add up your scores Which is the most successful type of coast protection in the Bahamas? Justify your opinion.

Groyne7000 pounds each Gabion100 pounds per meter Revetment2000 pounds per meter Sea wall pounds per meter Rock armour3000 pounds per meter Habitat restoration Very cheap – $1.50 per plant in Abaco Managed retreatCost in lost land BreakwaterVery expensive Approximate coasts of defences - taken from net.co.uk/topics/coastal_management.html net.co.uk/topics/coastal_management.html

All photographs taken by the author apart from google map pictures ( &spn= , &sll= , &sspn= , &t=h&hq=grand+lucayan&radius=15000&z=18https://maps.google.com/maps?q=grand+lucayan&hl=en&ll= , &spn= , &sll= , &sspn= , &t=h&hq=grand+lucayan&radius=15000&z= &spn= , &sll= , &sspn= , &t=h&hnear=Paradise+Island&z= &spn= , &t=h&hnear=The+Bahamas&z=7 and Nassau breakwater taken by arnett 117

Summary – mind map Conflicts on coastline – urbanization, transport, aquaculture, tourism and recreation, fishing, industry Problems caused by conflicts Managing coastline – hard or soft engineering Advantages and disadvantages of defence types. Grand Bahama examples of all the above