Application on Coastal management

Now that you have read the post on coastal management, look at the following pictures.

This set was taken at Changi Ferry Point where we take a bum boat to Pulau Ubin



What are these structure called?

Why are they built?

Recap
The traditional 'hard' defence is the sea wall.
Sea walls were vertical and deflected the energy of the waves away from the coast.

In doing so, however, they suffered a lot of expensive damage in a short period of time.

Sea walls are very expensive but should last 20-30 years.

Do you think this kind of protection is effective?

This set of pictures were taken at the Singapore Sailing Centre

What is this structure called?


Close up view of the structure.


Another view of the structure











Recap
A breakwater is often used to protect a harbour but may be used to protect a stretch of coastline.

They are usually made of concrete or blocks of stone but recent cheaper alternative suggestions have included oil drums and used tyres.

They have to be strong enough to take the full force of the waves.

Since they have to be built in deep water they are, like sea walls, expensive to build.

Access the effectiveness of using breakwater as a form of coastal management.




This set of pictures were taken when I went for the Sce 2 Camp at the camp cantre in East Coast.

What are these structure call?


This is how they are made at the beach.

Notice how a simpel chicken wire mash is made into a box?


Rocks are then filled up and place at the beeach where protection are needed.







Recap
The gabion is a metal cage filled with rocks, about 1 metre by 1 metre square.

They are stacked to form a simple wall.

They are used to protect a cliff or area in the short term only, since they are easily damaged by powerful storm waves and the cages tend to rust quite quickly.

Gabions have the advantage of ease of use and are relatively cheap but their life span is short.

Why do you think we use the gabions instead of sea wall and breakwater here?