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