用多时相InSAR技术研究廊坊地区地下水体积变化
Volume Change of Groundwater in Langfang Region Derived from Multi-Temporal InSAR
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摘要: 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。Abstract: This paper use multi-temporal InSAR(Multi-Temporal InSAR,MTI) technology to obtain the high-precision velocity field of Langfang city by two track SAR dataset between 2007 and 2010.The results show that the maximum rate of ground subsidence in Langfang is 76.0 mm/yr;there is a very significant subsidence funnel in downtown.Based on the deformation results,this paper uses free stress volume strain changes model to inverse the volume change of groundwater.The maximum peak volume change is 1.15×10-4/a,and the total volume change of groundwater is-5.54 billion m3/a.
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