Geology/regaridng artificial islands
I would like to know how artificial island is created, for example, Palm Jumeirah in Dubai. Are there any environmental side effects due to the creation of the artificial islands
Dear Ameen, Good morning and Fraternal Greetings!
Thank you very much for your question. My answer is as follows
The Palm Jumeirah was created by pouring sand fill onto the 10.5-metre-deep seabed using dredgers. Above sea level, 3 metres of the reclamation were achieved by a dredging technique known as "rainbowing", in which the sand fill was sprayed over the surface of the rising island. Calcareous sand was used for the reclamation. The island includes a curved breakwater using natural rock, intended to encourage the creation of a natural reef and provide habitats for sea life.
Generally these artificial barriers prevent the natural tide movement. Hence the sea water will become stagnant. Sometimes it is dangerous to the marine life as well. , but the constructed Palm Jumeirah stated that the breakwater has actually encouraged marine life and that new marine species are moving into the area.
Many reports state that the Palm was sinking and this has been confirmed now by geological surveys, at the moment it is 5 millimetres (0.20 in) per year but this could increase rapidly.
In addition to environmental impacts, these artificial constructions may change in area wildlife, coastal erosion and alongshore sediment transport, and wave patterns. the Sediments may be stirred up by construction will injure local marine fauna and reduce the amount of sunlight filtered down to seashore vegetation. Variations in alongshore sediment transport also changes in erosion patterns along coast.
Dr. DS Subrahmanyam