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利用多时相InSAR(multi-temporal InSAR,MTI)技术,以河北廊坊市城区为试验区,利用两个Track覆盖的SAR数据获取了该地区2007～2010年间的高精度地面沉降速率场。结果表明,廊坊市中心城区存在一个非常明显的沉降漏斗,其最大地面沉降速率为76.0mm/a。在此基础上,利用自由应力下的体积应变模型进行地下水体积变化反演,显示该地区的体积变化最大达到-1.15×10-4/a,整个研究区的地下水年抽取体积达554万m3。
Using multi-temporal InSAR (multi-temporal InSAR, MTI) technology and taking the urban area of Langfang City in Hebei as a test area, two track-covered SAR data were used to obtain the high-precision ground subsidence rate field in the area from 2007 to 2010. The results show that there is a very obvious subsidence funnel in the downtown area of Langfang, with a maximum ground settlement rate of 76.0 mm / a. On the basis of this, the volumetric strain model under free stress is used to invert the volume change of groundwater, which shows that the maximum volume change in this area is -1.15 × 10-4 / a, and the annual groundwater withdrawal volume in the whole study area reaches 5.54 million m3.