LAND RECLAMATION
ANUJA NAYAKAGE (08/47)CHAMIKA MUTHUKUMARANA (08/45)
3ND YEAR.CIVIL
ARTIFICIAL ISLANDS
Today we will be discussing:
Problem of the population and land space
Construction of the artificial island on
the ocean
Advantages & Disadvantages of artificial
island
PROBLEM OF THE POPULATION & THE LAND SPACE
The population problem is the biggest problem in the world today .
Pressure on the region’s are agricultural lands become leading to extensive degradation due to the poverty of land shortage .
THE EARTH PLANET
Percentage of crustal, About
70% water30% land
From 30% land also there are some barren spaces. Like mires.
People motivate to get benefits from the water areas.
SELECTION OF THE SEA AREA
To get more benefits from this project we must pay the attention for the sea space which having no
coral prosperityskerryseaweedsea vitalsocean trade routes
This islands are constructed technically artificial peninsulas of sand dredged from the bottom of the sea.
The sand is sprayed by the dredging ships, which are guided by GPS, onto the required area in a process known as rain bowing.
CONSTRUCTION OF THE ISLAND
Sand surcharge
Clay lumps
Inter-lump voids Filled water
Mean sea level
Seabed
UNDERGROUND CONSTRUCTION & SEA BED DREDGING
Place the material in the form of lumps, directly at the reclamation site
Sand siphoned up from the ocean floor, being deposited in one of the hoppers of the Dredge Island
CONSTRUCTION PROCEDURE
Temporary tube piles driven into sea bed
Temporary sheet piles and tie rods driven into sea bed to support boundary rocks (see figure 1)
Permanent boundary rock is constructed like bunds & it deposited either side of sheet piles
Hydraulic fill layers deposited between bunds to displace sea water and form island (see figure 2 with fill layers partially complete)
Permanent concrete units are placed around island to protect it from the waves
2m diameter 43m deep piles driven through island into the below of the sea bed to stabilize structure (see figure 3)
Island interior excavated and temporary sheet piles or coffer dam inserted
2m thick concrete plug slab laid at base of island
Reinforced concrete retaining wall built
Basement floors created (see figure 4)
FINALIZED RECLAMATION ISLAND
This island includeHomes HotelsOfficesAgricultural lands
ADVANTAGES OF RECLAMATION
Land reclamation will definitely increase land area for a certain country
More lands, more buildings and better infrastructure can be built
Can reclaimed lot of lands from flooding
DISADVANTAGE OF RECLAMATION
Land reclamation can be damaging to corals and marine life due to wrong selection of poor knowledge of the subject
THANK YOU