Effect of Land Subsidence on Urban Flood Prevention Engineering in Shanghai
Effect of Land Subsidence on Urban Flood Prevention Engineering in Shanghai
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发表时间：
2008
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通讯作者：
Gong Shi
中科院分区：
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作者：
Gong Shi
地面沉降通过减少地面高程损失直接威胁城市防洪安全，根据地面沉降监测结果和黄浦江年最高潮位监测结果，以及外滩防洪墙历次加高、下沉情况，结果表明，1921 - 2007年上海市地面沉降量为1.973 m，目前中心城区地面海拔约为3.5 m，中心城区陆地海拔高度几乎降低了黄浦江最高潮高，带来了长期的防洪压力，黄浦江最高潮高年平均值约为4.59 m，上海外滩防洪堤的四次加高工程中，地面沉降起了重要作用，地面沉降量分别占总沉降量的98.0%、62.6%、30.1%、10.0%、1目前，现有的防洪设施已受到地面沉降的威胁，1994 - 2006年区域地面沉降量占总沉降量的71.9地面沉降是危及城市防洪安全的重要因素，是城市灾害系统的重要环节，地面沉降的防治已成为减轻和预防自然灾害的重要内容。
The land subsidence directly threatens the safety of urban flood defence by decreasing the land altitude loss.According to the monitoring results of the land subsidence and the yearly highest tide height of the Huangpu River and all previous heightening and subsidence conditions of the flood defence wall in the Bund,it is shown that the amount of land subsidence in Shanghai was 1.973 m from 1921 to 2007 and the land altitude of center town is about 3.5m at present,and the land altitude of center town almost lower the highest tide height of Huangpu River and brings about the long-term flood defence pressure.The yearly average value of highest tide height of the Huangpu River is about 4.59 m,and the highest tide height gradually raises.The conditions of flood and inundation are intrinsicly link with the development of land subsidence.The land subsidence plays a important role in the four times of heightening of the flood defence wall in the Bund,and the land subsidence amount occupied 98.0%,62.6%,30.1%,7.8% respectively of the heightening of the flood defence wall.Now the existing flood defence installations have been endangered by the land subsidence,the regional land subsidence amount from 1994 to 2006 was 71.9 % of total subsidence of the flood defence wall in the Bund.The land subsidence is an importment factor of endangering the urban flood prevention safety and a key link of urban calamity system,and to give rise to our highly precautions for its long-term harmful effects.The prevention and control of the land subsidence have to be the crucial contents of mitigating and preventing natural calamities.