北京地面沉降时空分布特征研究

发布时间：2018-04-22 08:34

  本文选题：小基线干涉测量 + 标准差椭圆　； 参考：《地球信息科学学报》2017年02期

【摘要】：20世纪60年代以来,北京市地面沉降不断发展,目前已经形成了东郊八里庄-大郊亭、东北郊-来广营、昌平沙河-八仙庄、大兴榆垡-礼贤和顺义平各庄5个沉降区。本文选取目前地面沉降较为严重的北京市朝阳区、顺义区和通州区作为研究区,利用2003-2010年的47景ASAR影像数据,采用SBAS-InSAR技术获取了研究区的地面沉降监测结果,并分别以SFP点年均沉降速率和各年沉降量作为权重,计算SFP点空间分布中心与方向特征椭圆,定量分析了研究区地面沉降时空特征。结果表明:2004-2010年,北京市地面沉降表现为严重的不均匀沉降,年沉降量最大值由104.04 mm增加到178.83 mm;标准差椭圆长轴与南北方向平行,反映出地面沉降空间发展方向性在南北方向较东西方向明显,椭圆面积由592.25 km~2减小到503.84 km~2,表明2004-2010年研究区内发生地面沉降的区域范围变化呈减小趋势,但从沉降量可以发现,北京地面沉降一直处于加重趋势。
[Abstract]:Since the 1960s, the land subsidence in Beijing has been developing continuously, and now it has formed five settlement areas in the eastern suburb of Balizhuang-Dazuting, the northeast suburb of Laiguanying, the Shahe-Baxianzhuang of Changping, the Daxing Fai-Lixian and the Shunyi Pingzhuang. In this paper, we select Chaoyang District, Shunyi District and Tongzhou District, which have serious ground subsidence at present, as research areas, and use 47 ASAR images from 2003 to 2010 to obtain the monitoring results of land subsidence in the study area by using SBAS-InSAR technology. The spatial distribution center and directional characteristic ellipse of SFP point are calculated by taking the average annual settlement rate and the annual settlement amount as weights, respectively, and the space-time characteristics of land subsidence in the study area are quantitatively analyzed. The results show that the ground subsidence in Beijing was seriously uneven from 2004 to 2010, the maximum annual settlement increased from 104.04 mm to 178.83 mm, and the standard deviation elliptical long axis was parallel to the north and south directions. It shows that the direction of land subsidence spatial development is more obvious in the north and south direction than in the east and west direction, and the elliptical area is reduced from 592.25 km~2 to 503.84 km2, indicating that the variation of the range of the land subsidence in the study area from 2004 to 2010 shows a decreasing trend, but it can be found from the settlement amount. Beijing land subsidence has been in an aggravating trend.
【作者单位】： 三维信息获取与应用教育部重点实验室;城市环境过程与数字模拟国家重点实验室培育基地;首都师范大学资源环境与旅游学院;
【基金】：国家自然科学基金项目(4140010982);国家自然科学基金重点项目(41130744);国家自然科学基金面上项目(41171335) 北京市教育委员会科技计划面上项目“浅地表空间利用差异模式下的地面沉降演化特征”
【分类号】：P642.26
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本文编号：1786403