• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Compare Seaford's Method of Coastal Defence with the one at colchester

Free essay example:


The difference between coastal management techniques in Seaford and Colchester

Due to global warming, sea levels have risen by about 20 cm over the last 100 years. In UK, coastal areas are now more vulnerable to flooding and erosion. To defend the local settlements, various methods could be used:

Seaford (Beach Nourishment):

In Seaford, the beach is nourished with shingles to reduce the impact of waves. As known from Task 3, shingle has a high infiltration rate and has a heavy mass, waves coming inshore are less likely to be destructive and berms are created as a result. The Long Groyne is also built to trap shingle from being moved away by long shore drift.

image00.jpg

Abbotts Hall Farm (Managed Retreat):

At Abbotts Hall Farm on the Salcott Channel, 4 holes are drilled on the old sea wall and 84 hectares of farmlands have been abandoned to the sea in October 2002. The land is expected is grow into saltmarshes, which can reduce the impact of a wave by up to 95%. Two counter walls are repaired on the east and west, preventing surges from neighbouring estuaries and thus protect the settlement behind.image01.jpgimage02.png


Comparison of the Pros and Cons

in Both Methods

Economically:

  In Seaford, the beach is a valuable tourist resource, which attracts visitors to stay. More investors will come to Seaford with the place now/being protected from flooding. Shopkeepers would also be attracted to open stalls and booths on the side of the beach with benches along the side. House prices would predict to be risen as well due to their perfect sea views.

  At Abbotts Farm, on the other hand, is not a tourist attraction. The salt marsh appeals only to eco-students, professors and is only a place for fishing. Furthermore, farmlands are lost due to the scheme, thus food supply is reduced. House prices decrease as the livelihood of individual people is threatened.

Financially:

  The beach in Seaford needs to be replenished from time to time as shingles are moved by long shore drift. The pebbles have to be redistributed over the beach occasionally due to the effect of long shore drift. Even though this is cheaper than repairing the sea wall, an annual cost of ₤60,000 is needed to sustain the beach.

However, managed retreat at Abbotts Hall Farm is the cheapest way of beach management. The cost of the scheme is virtually nothing when comparing to beach replenishment. Although, the government have to buy the land that is going to be covered by water and pay for the seedling for the saltmarshes, it does not require annual repairing cost. This saves about ₤500,000 for the next 20 years.

Environmentally:

  The beach in Seaford is, in a way, a disturbance to the surrounding environment. Every 4 months, a machine will push shingles from the long groyne back towards the Buckle Inn creating noise pollution. Ships also come in every so often to dump in new shingles, interrupting the marine life nearby.

  Managed realignment at AHF in comparison, is a comparatively environmental friendly project; in which it allows the regeneration of 200 acres saltmarshes. As a result, marine lives are restored with shore crabs, jellyfish, shrimp, teal, duck and other birds moved in to this new environment. This method does not disturb the animal cycle, and it looks much better than hard concrete sea walls.


The Effectiveness of Both Plans

Seaford:

The beach nourishment costing ₤ 9m at Seaford is finished on 1987. In October, 1987, this new sea defence is tested by “Hurricane Ethelred”, which is known as the worst storm for 200 years. Apart from several shingles which were moved out of place, there was no sign of flooding whatsoever. As suggested by My Tony Holmes of Southern Water Authority stated in “the beach was a 100% success story.”

Abbotts Hall Farm:

Managed retreat at Abbotts Hall Farm is “a sustainable coastline which is better for wildlife and for people.” claimed by John Hall, the director of Essex Wildlife Trust. Although the scheme has not yet been tested by severe storms, everything goes exceptionally well. After the sea wall is breached in October 2002, brand new saltmarshes have grown in spring 2003, thus creating a good environment for wildlife habitats. These saltmarshes are believed to be able to slow down wave surges and protect its neighbouring coast.

As both beach nourishment & managed retreat are “soft engineering”, Could Seaford adopt the method of “Managed Retreat”?

Even though managed retreat is a much cheaper/more economic method, the technique does not seem to work in Seaford. Managed Realignment is a scheme that involves creating saltmarshes and houses to build behind a “set-back” line by sacrificing some land along the coast. to create saltmarshes and houses have to build behind a “set-back” line. As a town which locates along the coast. if “managed retreat” is applied, the land sacrificed will thus become a whole settlement and flooding would definitely be resulted in Seaford. Thousands pounds would be lost as a negative impact. Abbotts Hall Farm, however, is relatively a less important place, while the farmlands sacrificed would be helpful for saltmarshes to grow.

Evaluation

By Comparing both beach nourishment in Seaford and managed retreat in Colchester, even though both methods are soft engineering, they have different pros and cons in terms of financial and environmental considerations. To conclude, though both plans show positive results against storms and erosion and would be cheaper when comparing with hard protection. However, “managed retreat” should not be applied to Seaford as the town is relatively important.

Reference

Websites:

http://www.essexwt.org.uk/

http://www.wwf.org.uk/

http://www.natura.org/

http://www.bbc.co.uk/essex/

http://www.environment-agency.gov.uk/

http://www.guardian.co.uk/

& with help of Google Search Engine (http://www.google.co.uk/)

Geo Fact Sheets:

        Coastal Management – Paul Bennett – Nov 2003

        Coastal Erosion: Back to Nature – Nell Punnett – Sep 2000

Acknowledgement:

Many Thanks to Paul CK Chu of Hong Kong Civil Enginneering and Development Department, who provides me with extensive knowledge on managed retreat.

This student written piece of work is one of many that can be found in our AS and A Level Coastal Landforms section.

(?)
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Related AS and A Level Geography Skills and Knowledge Essays

See our best essays

Related AS and A Level Coastal Landforms essays

  1. "An investigation into the methods of coastal management along Brighton's Coastline and the reasons ...

    beach profile is done to establish the shape of the beach and also to measure the gradient of the beach. In order to carry out the beach profile a total of three people were required. The beach profiles were carried out on both a constructive and destructive beach.

  2. Swanage and Coastal Erosion

    The Effects of Costal Erosion on People Local residents such as Miss Younger and Mr Singh want to build extensions but cannot get loans from the bank in order to do the work. This because they think the land would not be there for long.

  1. Is Dawlish Warren is threaten by human impacts and marine processes.

    cutting and pond clearance as well as fencing and marram grass planting to restore trampled areas. There are restrictions on dog walking and in some places they are completely banned but part of this site has an area where dogs can be exercised freely.

  2. Coastal Management in PorlockBay

    Bristol Channel Porlock Bay Sandstone Clay Limestone Resistance rock soft rock resistance rock Rocks such as Sandstone and Limestone are resistant to erosion. These rocks will form headlands and cliffs. Soft rocks such as Clay are easily eroded and will form wide beaches called Bays.

  1. I am going to study Camber Sands and Fairlight to see if the hypothesis ...

    * Quadrat - This is a hollow, flat metal square which we dropped every two metres up the beach to measure ground cover and also used it to help measure pebble size and roundness. For ground cover we dropped the quadrat and estimated the percentage cover inside it (i.e.

  2. Trace the History of Coastal Defence in the UK

    For these reasons, geomorphologists have long been interested in reducing the variety and complexity of coastal landforms to a relatively small number of distinctive types. C.A.M. King (1980) has suggested that systems of coastal classification are of two types, descriptive and genetic, and argues that the genetic type is preferred,

  1. Mauritius restaurant project

    First of all is the management style. As mentioned above, the restaurant is managed by only one restaurant manager, which is not enough regarding the size and seating capacity. Very often, the Bellevue is so busy that it cannot be managed properly by only 1 manager and there is much more pressure on the staffs, which leads to poor service provided to its customers.

  2. "Comparing the mean ratios of shell height/diameter of the Patella spp on an exposed ...

    The strong muscular foot and a thin film of mucus between the foot and the rock enable Patella vulgata to grip very strongly to the substratum (Fretter & Graham, 1994). Adult species have tough shells that offer protection from abrading factors and any near vibration causes the shell muscles to contract vigorously, clamping the organism to the substratum.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work