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quote:Originally posted by Laithyes its been done before like Neil saidmost of the man-made islands are being built in Dubai (a city in the United Arab Emirates), these pictures above show one of the "palm islands" and "the world", which are only 2 projects out of at least 8 that belong for just one company competing with 2 more big companies. it's also possible to have a ski resort in the middle of the desert! its been done in Dubai tooif you wanna see more projects check out the company's website www.nakheel.ae there are more pics and trailer videos, and you can buy yourself a really nice villa on the beach or even a whole island if you want Laith
quote:Originally posted by tony6789Would it be possible to make an island? or would it disrupt natire too much?- Big T
quote:Originally posted by daveshortsIf there was no tectonic activity rebuilding them, then yes the continents would eventually errode away. As it is the continents errode into the continental shelves, and then when the continents collide they scrape all the rock up off the seabed and build mountains - repeat until the earth cools.
quote:Originally posted by JimBobI do not think that there is such a thing as a "strategically placed" island. An island in the mouth of a water flow causes the a reduction in the amount of area in which water can flow. Depending on the amount of restricted area, the same amount of water will need to flow through a smaller area, resulting in higher water velosity (and more erosion) especially on the edges of the island and bounding land.
quote:Originally posted by daveshortsOk volcanos can produce land, but most of the ones that produce continental rocks (the less dense ones like granite as opposed to things like basalt) are associated with subduction zones, and therefore can be considered part of the scraping process.
quote:Sedimentation can produce more land, but it can't increase the average height of the land which is what is important in the very long term...
quote:Of course whether the continents would errode away before they froze as there would much reduced volcanic CO2 emmisions, no not enough greenhouse effect to keep the planet warm, is another matter.
quote:Originally posted by JimBobIt is very simple, really. A geologic system and its sub-systems, be it an estuary with its sand bars, a delta with the river channels, a long-shore current system with barrier islands, or a "simple" volcano can be considered a closed system. As such, a geological system is subject to all the physical laws to which a car engine, a chemical solution, or a galaxy are subject. ALL laws - no exceptions. Entropy is at work in any system. Any work put into the system, be it the dredging of a harbor or the building of an artificial island, adds energy to the system causing a disruption in the energy budget. So as with all systems with an energy budget, if the budget is disrupted, a geologic system will seek a stable state. In all cases of which I am aware, the islands are only temporary unless energy is added to the system continually to keep the island above water. The most famous island I can think of which shows the needs of continual upkeep is Île de la Cité, home of Notre Dame Paris. In Roman times the island was a low-lying area subject to flooding that offered a convenient place to cross the Seine. It was one of three island in the Seine, only two of which remain. When the Merovingian King, Clovis, made his home on the isle, a small wooden breakwater was added on the up-stream side to prevent the frequent flooding. (anecdotal source, but it had to occur some tine) The island has been continually added to since then, and, along with the construction of a stone breakwater surrounding the island, it keeps the surface dry. The building up of the surface has buried the Roman fortifications that were uncovered this century in front of the church. Breakwater walls are constantly repaired to keep this island above water. If the islands now remaining in the river had not been maintained by man they would have gone the way of the third island.Energy and work must balance in a large, complex system. As energy is constantly being expended by the river, man must fight the effects continually. It is the same with ANY man-made construction that tries to impede nature's forces. That is the way it is, not how we might want it to be. If geologic process did not follow natural laws, including the three laws of thermodynamics and their mechanical equivalents, geology would not be a science, but voodoo. And I do not have a license for voodoo! [}:)]
quote:Originally posted by JimBobI suspect you are speaking of unbounded system. I am arguing that a finite system with intervention from man would necessitate work to keep the man-made part of the system from changing. Yes, if the system were large enough, there COULD be accomidation in a different part of the system. An island and it's immediate surrondings are a small system. The Sun and the resultant air, wind and water generation is a HUGE system.
quote:Originally posted by another_someonequote:Originally posted by JimBobI suspect you are speaking of unbounded system. I am arguing that a finite system with intervention from man would necessitate work to keep the man-made part of the system from changing. Yes, if the system were large enough, there COULD be accomidation in a different part of the system. An island and it's immediate surrondings are a small system. The Sun and the resultant air, wind and water generation is a HUGE system. An island will not exist in isolation.In the general sense, I would agree that no matter what happens, a natural system will constantly be in a state of change, and the only way to avoid change in constant vigilance and intervention; but is does not follow that all change will lead to a reduction of the size of the island.If the island is in the mouth of a river that carries a large amount of silt, then careful design of the perimeter of the island can cause that silt to be deposited around the island. As you have said before, this will not do much to increase the size of the island above water level, but it would at least provide a growing defensive barrier around the island. Ofcourse, this silt is created by the erosion of land upstream, and so there is a compensating system where land is eroded at the upper reaches of the river, and deposited at the mouth of the river, around the artificial island.George
quote:Originally posted by JimBobNow, the definition of an island has changed from something above water level to something level with it. My dictionary says an island is a land mass. I believe what you described is called a bar.