infrastructures. since subsidence was established in one thousand nine hundred eighty one in shanghai they ve measured a lot of elevation of two to three meters. allow me for you. to keep watch on this change the city built an extensive surveillance network. through the storm. this is our ground subsidence monitoring network for shanghai. it s made up of thirty seven land subsidence monitoring stations. we re here in one of the this is where we monitor the evolution of ground subsidence and the different layers at various steps. today the measurements are carried out fully automatic lay the real time monitoring of the different soil layers makes it possible to observe the variations of subsidence more than two hundred meters below
since the year nine hundred ninety three and it shows that it has risen in most places but not everywhere here in the eastern pacific we see an area where the sea level even has dropped in this period but on the other side here in the western pacific it has risen much more than ever edge because obviously the trade winds have increased there pushing the water over here and piling it up on the east asian causing. it to be of some coastal towns and cities can increase the risk of flooding that s particularly true of large cities situated on deltas like bangkok shanghai and new orleans. and. these deltas are incredibly flat you could go one hundred kilometers and the elevation ups and downs would only be a few meters at most so they re extremely flat so putting a city on these flat lands is rather easy to do.
rises every morning and order to block the high tide when at the end of its house. this mobile dike protects an area that has sunk by more than three meters in a hundred years due to excessive pumping of water from the water table. beginning in one thousand nine hundred twenty is chinese all floridians have been measuring the steady sinking of the city. to study the phenomenon shanghai established a ground subsidence institute the only one of its kind in the world. lucian and. africa say yes until the one nine hundred sixty s. too much ground water was removed in shanghai. only this led to
located on the yangtze delta shanghai symbolizes the race for economic development with twenty three million people it is the most populated city in china. it is about is chinese success and ams to become the leading financial hub in asia . shanghai continues to grow. its expansion seems limitless in spite of the threats from nature. life in this city has always been mocked by the time i fand the word which alarms the population is the chinese term for a tropical typhoon which brings violent winds and torrential rains periodic late
the surface today we extract less than ten million tons of coral more to every year as a consequence our level of subsidence remains under six millimeters. since one thousand nine hundred sixty six pumping from the water tables has been strictly regulated in shanghai yet ground subsidence continues at a rate of six millimeters per year. some blame is being put on its many buildings some scientists believe the weight of the huge new skyscrapers is increasing ground subsidence. no expert is willing to comment on this at present. yet the information has been officially published by the institute for ground subsidence in shanghai. in recent years with the launching of large