Coasts case studies
- Created by: 13cr240
- Created on: 06-08-19 17:06
Describe ICZM
Integrated coastal zone management is a process that brings togther all of. those involved in the devolpment, management and use of the coast. This ususally involves complete sections of a coastline being managed as one aand not just individual towns as we know that human actions in one place can have serious impacts downshore as sediment moves in ssediment cells.
The main aims are:
- To establish sustainable levels of economic and social activity
- Resolve environmental, social and economic challenges and conflicts
- Protect coastal environments
Describe SMP
Shoreline management plan is a policy for managing the coastline and responding to the coastal erosion in the next 100 years.
It assesses potentail erosion and flood risks then identifies sustainable coastal defences and management options which take into account influences of human, natural and historic environments.
Describe the population and the land use on the Ni
Population:
- Home to 2/3 of country population
- Responsible for 60% of the countrys food supply.
Land use:
- Beach resorts
- Fish farms
- Agriculture
- If flooded 20% of delta would go under threat
Describe why the nile delta is receding
- The delta is shrinking. as the builiding of the Aswan high Dam in the 1960s reduced the amount of sediment accumulation so the. coastline is receding in ssome areas by 175m
- Its 270km coast lies at low altitude. mostlybetween 0-1m so melting of ice caps could flood areas.
- The aquifer underground is being pumped excessively caaausing land to sink
Example of Fjords, raised beach and Rias
Fjord
- Sogne Fjord in Norway
Raised beach
- In Arran
Rias
- Portsmouth Harbour
What is emergent and submerging coastlines caused
Emergent coastlines are caused by an increase in sea level or isotatic recovery
Submergent coastlines are caused by an increase in sea level or isostatic subsidence
Environmental impacts of recession on the Holderne
- Wildlife behind spurnhead is losing diveristy as many species cannot be. supported as lack of sediment.
- Kilnsea wetlandss are at risk as sea water intrusion.
Describe the economic impacts of recession on Hold
- Tourism industry and number of visitorshas dropped
- Some settlements are unable to maintain visable population to warrent shops and industries
- Money had to be spent on coastal defences
- Gas terminal at Easington which supplies 25% of Britains gas at risk
Describe the social impacts of recession on the ho
- 30 villages have been lost since Roman times
- Many settlements rely on tourism and facilites may be forced to shut
- Properties under threat from erosion may lose value leaving owners withnegative equity
- Migration
Facts about the Holderness coastline
- Its in sediment cell 2
- Main sediment is supplied from the erosion of the. weak unconsolidated glacial till rocks
- There are groynes at Mappleton
- In some areas erosion rate is 10m per year which. is one of the most rapid rates in europe
How much has the Earths temperature risen by
In the last century it has risen by 0.75 degrees
Describe why the Maldives are at risk from coastal
They lie at very low elevation with thehighest point being 2.4m and paired with the fact that sea levels are rising at a rate of 3 inches per year
- Population of around 400'000 in 2017
- GDP per capita is $10536
- HDI is 0.688
- Highest point is 2.4m
- The city of hope is the artifical island which is being built to house environmental refugees
- Governemtn is buying land in over countries to house these refugees
Developed nation flood risk case study
USA
It has a national hurricaane centre to report on flood risk
HDI of 0.924
Give examples of Igneous ,sedimentary and metamorp
Igneous:
Basalt and granite
Sedimentry:
Sandstone and limestone
metamorphic:
Slate and schists
Give an example of a high and low energy coastline
High energy:
Cornwall and Atlantic facing areas
Low energy:
Linconshire and East coast
Describe the geology of St bees and the website
St bees is made up of a mixture of Sandstone and glacial till
Britishgeologicalsurvey.com
Describe the fetch around the UK
From the south west starting at the gulf of mexico.
It is around 8000km long
Give an example of a concordant and discordant coa
Concordant
- Lulworth Cove, Dorset
Discordant
- Holderness coastline
Which direction are faults and cracks
Joints are vertical cracks
Faults are horozontial cracks
Give an example of a UK salt marsh and sand dune
Saltmarsh:
- Solway saltmarsh
Sand dune
- Drigg sanddunes
What is the order of sand dune succession
1- Embryo dune
2- Fore dune
3-Yellow dune
4-Grey dune
5- Dune slack
6-Mature dune/heath
Give an example of a species in the embryo/fore du
Embryo/fore dune
- Sea holly
Yellow dune
- Marram grass
Grey dune
- Wild thyme
- Lichens
- Heather
Dune slacks
- Bog cotton
- Natterjack toads
- Rushes
Describe the difference between attrition and abra
Abrashion is when the sediments are picked up and attack the cliff face
Attrition is when sediments clash toegther to break them down
Give an example of a UK barrier beach, tombolo and
Barrier beach:
- Loebar in Cornwall
Tombolo
- St Ninnians Island in the Shetland Islands
Cuspate forelands
- Dungerness
Give an example of a UK bar, offshore bar and head
Bar:
- Slapton Ley, Devon
Offshore bar:
- paddys gap at Milford on sea
Headland:
- St Bees head
Give an example of a UK bay ,spit and double spit
Bay:
- Swanage bay
Spit:
- Spurn head
Double spit:
- Poole harbour
Describe the UK sediment cells
Thereare 11 cells and the Cumbrian coast is in sediment cell 11 from Great Orme to the solway firth
Describe the difference between a swash and drift
A swash aligned beach is one where sedimnet moves up and down the beach with little lateral movement. It produces smoothly curved, concave beaches.
A drift aligned beach is one where sediment moves along the coast by longshore drift.
Describe the negative and positive feedback
- Negative feedback is when the. eqwuilbrium returns to its original position.
If the sediment budget increase negative feedback takes place as there is more deposition as there is more sediment carried in the waves so it returns to its original holding caapcity.
- Positive feedback is when one change leads to another
If there is a reduction in sediment available the waves will erode the cliffs more as the sea has more energy. Therefore positive feedback takes place.
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