长江三角洲地区的相对海平面上升与地面沉降

RELATIVE SEA SURFACE RISE AND LAND SUBSIDENCE IN CHANGJIANG DELTA AREA

在有关学者以往研究工作的基础上,对长江三角洲地区的相对海平面上升和地面沉降问题作了分析探讨。认为相对海平面上升已经在并将继续在该区造成多种危害,地面沉降是影响相对海平面上升诸多因子中贡献率最大的因子,它主要由人类活动引起,同相对海平面上升一样,也是该区不容忽视的地质灾害之一。然而,由于采取了积极的控制措施,上海地区人为引起地面沉降在相对海平面上升中的贡献率已从20世纪50、60年代的90%以上降至目前的60%以下,但预计在未来几十年中仍将占相当大的比例,必须引起人们的高度警觉,采取更为积极的防治对策。

This paper analyzes and discusses the relationship between the sea surface rising and the land subsiding in Changjiang Delta area. The sea level surface relative rising can result in numerous damages, and the land subsidence, mainly induced by human activities, owes to he sea level surface relative rising and has become one of the geological hazards in this area. Although the ratio of man-induced land subsidence decreased from 80%～90% in 1960s～1970s to less than 60% at present because of the positive and effective control, it is estimated that in the next tens of years this ratio will be considerable still. It is suggested that the human being must keep his eyes on this phenomenon and take more positive countermeasures for control.