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What Bugs Me
Posted on 28 Oct 2011
Wooden poles not a long-term solution for stopping soil erosion at Changi Beach
STOMPer Cow sense thinks more needs to be done to prevent soil erosion at Changi Beach Park. He suggests building a breakwater instead of driving wooden poles into the sea bed.
He says:
"Parts of the beach are affected by soil erosion and even the tree roots are exposed.
"To stop the soil erosion, a row of wooden poles have been driven into the seabed in order to contain the soil erosion.
"This beach is assaulted by the waves 24/7 and eventually the wooden poles will give way.
"To stop the soil erosion, a concrete breakwater is necessary as the waves will keep pounding on the coast and cause more trees to topple over."
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Keywords:
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,
soil erosion
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temporary fixed lah.
For info, those poles are Bakau wood. They are used for the temporary stabilization of unstable soils, slopes & embankments -- in which case, they are known as bakau piles (the process is called bakau piling). Bakau wood is harvested from Rhizophora mangrove trees, & is resistant to rotting during prolonged immersion in water or wet soil.
* Photo of Bakau Piles: http://www.ramungan.com/products.htm
* PUB's Specification for Bakau Piles: http://goo.gl/jhrqV
* Bakau Trees: http://www.naturia.per.sg/buloh/plants/rhizophora.htm
Teak wood is very much more expensive, & thus generally not "wasted" as piling material.
Those beach-reinforcing bakau piles have been at Changi Beach for sometime now. However, a concrete breakwater or other artificial shore-revetments are merely temporary stop-gap measures.
The relevant authorities might wish to look into more sustainable long-term solutions, such as replanting native seaward-tolerant mangrove tree species (eg. Avicennia, Sonneratia) along the shoreline & nearshore. When established, the tree roots & associated coastal community not only serve to grip onto the coastal floor, but also help dissipate wave energy, as well as encourage sediment deposition at suitable spots.