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利用Envisat获取的盐城地区2004年1月—2009年5月的6景SAR数据,通过合成孔径雷达差分干涉测量技术处理,得到了2004年1月—2005年1月、2005年6月—2005年11月和2008年12月—2009年5月盐城市地表形变场。研究结果表明,盐城主城区在2004年1月到2005年1月之间整体沉降量相对较小,仅存在一个平均沉降量为-5 mm左右的沉降小漏斗,不存在较大的沉降漏斗;在2005年6月到2005年11月之间沉降中心有所转移,出现了两个新的区域性沉降区域,最大沉降量可达-39.4 mm;2008年12月到2009年5月之间,盐城主城区区域性沉降区域的范围有所减小,但出现了新的沉降漏斗,平均沉降量可达-12 mm。沉降量的加大与盐城市地下水的过度开采有关。
The six-scene SAR data of Yancheng area from January 2004 to May 2009 obtained by Envisat were processed by the differential interferometry technique of synthetic aperture radar. The data of January 2004-January 2005, June 2005-June 2005 November and December 2008 - May 2009 Yancheng surface deformation field. The results show that the overall settlement of Yancheng main city is relatively small from January 2004 to January 2005, there is only one small settlement funnel with an average settlement of -5 mm, and no large settlement funnel exists. During June 2005 to November 2005, the settlement center shifted and two new regional subsidence areas occurred, with the maximum settlement reaching -39.4 mm. From December 2008 to May 2009, The scope of the subsidence area in the main urban area of Yancheng has been reduced, but a new subsidence funnel has emerged with an average settlement of up to -12 mm. The increase of settlement is related to over-exploitation of groundwater in Yancheng City.