Change of Groundwater Seepage Field and Its Influence to Development of Land Subsidence of Shanghai

The groundwater exploitation and level decline are the key factors for change of seepage field in aquifer system.And it influences to the development of land subsidence. At present,the groundwater exploitation has shown the new changes,which are caused by groundwater table in the deep aquifer continually dropping,and engineering pumped in shallow aquifer and effect of exploitation in neighboring provinces.So seepage field has notable change and influence to control of land subsidence.To strengthen more the systematic management of groundwater and control the groundwater table are the important links to protect the land subsidence.