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An artificial island or man-made island is an island that has been constructed by people rather than formed by natural means. They are created by expanding existing islets, construction on existing reefs, or amalgamating several natural islets into a bigger island. Early artificial islands included floating structures in still waters, or wooden or megalithic structures erected in shallow waters (e.g., crannógs and Nan Madol discussed below). In modern times artificial islands are usually formed by land reclamation, but some are formed by the incidental isolation of an existing piece of land during canal construction (e.g. Donauinsel and Dithmarschen), or flooding of valleys resuting in the tops of former knolls getting isolated by water (e.g. Barro Colorado Island). The largest artificial island, René-Levasseur Island, was formed by flooding of two adjacent reservoirs. Some recent developments have been made more in the manner of oil platforms (e.g., Sealand and Republic of Rose Island). Artificial islands may vary in size from small islets reclaimed solely to support a single pillar of a building or structure, to those that support entire communities and cities. ==History== Despite a popular image of modernity, artificial islands actually have a long history in many parts of the world, dating back to the reclamed islands of Ancient Egyptian civilization, the Stilt crannogs of prehistoric Scotland and Ireland, the ceremonial centers of Nan Madol in Micronesia and the still extant floating islands of Lake Titicaca.〔http://books.google.com/books?id=AV3UAAAAMAAJ&pg=PA6&dq=artificial+island+ancient+egypt&hl=en&sa=X&ei=sulqU6PsKcemygGbiIDYDA&ved=0CE8Q6AEwBg#v=onepage&q=artificial%20island%20ancient%20egypt&f=false〕 The city of Tenochtitlan, the Aztec predecessor of Mexico City that was home to 500,000 people when the Spaniards arrived, stood on a small natural island in Lake Texcoco that was surrounded by countless artificial ''chinamitl'' islands. The people of Langa Langa Lagoon and Lau Lagoon in Malaita, Solomon Islands built about 60 artificial islands on the reef including Funaafou, Sulufou and Adaege. The people of Lau Lagoon build islands on the reef as these provided protection against attack from the people who lived in the centre of Malaita. These islands were formed literally one rock at a time. A family would take their canoe out to the reef which protects the lagoon and then dive for rocks, bring them to the surface and then return to the selected site and drop the rocks into the water. Living on the reef was also healthier as the mosquitoes, which infested the coastal swamps, were not found on the reef islands. The Lau people continue to live on the reef islands.〔 Many artificial islands have been built in urban harbors to provide either a site deliberately isolated from the city or just spare real estate otherwise unobtainable in a crowded metropolis. An example of the first case is Dejima (or ''Deshima''), created in the bay of Nagasaki in Japan's Edo period as a contained center for European merchants. During the isolationist era, Dutch people were generally banned from Nagasaki and Japanese from Dejima. Similarly, Ellis Island, in Upper New York Bay beside New York City, a former tiny islet greatly expanded by Land Reclamation, served as an isolated immigration center for the United States in the late 19th and early 20th century, preventing an escape to the city of those refused entry for disease or other perceived flaws, who might otherwise be tempted toward illegal immigration. One of the most well-known artificial islands is the Île Notre-Dame in Montreal, built for Expo 67. The Venetian Islands in Miami Beach, Florida, in Biscayne Bay added valuable new real estate during the Florida land boom of the 1920s. When the bubble that the developers were riding burst, the bay was left scarred with the remnants of their failed project. A boom town development company was building a sea wall for an island that was to be called Isola di Lolando but could not stay in business after the 1926 Miami Hurricane and the Great Depression, dooming the island-building project. The concrete pilings from the project still stand as another development boom roared around them, 80 years later. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「artificial island」の詳細全文を読む スポンサード リンク
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