Airports on water
River deltas are difficult place for map makers. The river builds them up , the sea wears them ; their outline are always changing . The changes in china's pearl River delta, however, are more dramatic than these natural fluctuation . An island six kilometres long and with a total area of 1248 hectares is being created threre. And the civil engineers are as interested in performance as in speed and size . This is a bit of the delta that they want to endure
The news island of chek Lap Kok, the site of Hong Kong's new airport, is 83% complete. The giant dumper trucks rubling across it will have finished their job by the middle of this year and the airpot itself will be built at a similarly breakneck pace
As chek Lap Kok rises, however, another new Asian island is sinking new Asian island is sinking back into the sea . This is a 520-hectare island built in Osaka Bay , Japan, that servs as the Platform for the new kansai airpot . Chek Lap way, and Thus hopes to avoid the same sinking fate.
The usual way to reclaim land is to pile sand rock on to the seabed. When the seabed oozes with mud , this is rather like placing a textbook on a wet sponge: the weight squeezes the water out, causing both water and sponge to settle lower.The settlement is rarely even: different parts sink a different rates . So buildings , pipes, roads and so on tend to buckle and crack . You can engineer around these problems , or you can engineer them out. Kansai took the firs approach ; chek Lap Kok is taking the second.
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