Anatomy of Subsidence in Tianjin from Time Series InSAR
Anatomy of Subsidence in Tianjin from Time Series InSAR
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DOI：
10.3390/rs8030266
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
Peng Liu;Qingquan Li;Zhenhong Li;T. Hoey;Guoxiang Liu;Chisheng Wang;Zhongwen Hu;Zhiwei Zhou
中科院分区：
文献类型：
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作者：
Peng Liu;Qingquan Li;Zhenhong Li;T. Hoey;Guoxiang Liu;Chisheng Wang;Zhongwen Hu;Zhiwei Zhou
地下水是中国天津市淡水的主要来源。过去20年该地区地下水平均开采量每年在0.6至8亿立方米之间波动。受此影响，天津出现了明显的沉降。本研究利用C波段Envisat（环境卫星）ASAR（先进合成孔径雷达）图像和L波段ALOS（先进陆地观测卫星）PALSAR（相控阵型L波段合成孔径雷达）数据，利用InSAR时间序列技术恢复了2007年至2009年期间地球表面的演化。在 ASAR 和 PALSAR 平均速度图的重叠区域中可以观察到类似的沉降模式，最大雷达视线速率约为 170 mm·year−1。使用 Mogi 源阵列对西部沉降进行地下水量变化建模。分析了主要断裂地质对东部沉降的控制作用。东部沉降的储存系数是通过InSAR位移和水位变化的时间模式来估计的。 InSAR 已被证明是与地下水使用相关的沉降监测和位移解释的有用工具。
Groundwater is a major source of fresh water in Tianjin Municipality, China. The average rate of groundwater extraction in this area for the last 20 years fluctuates between 0.6 and 0.8 billion cubic meters per year. As a result, significant subsidence has been observed in Tianjin. In this study, C-band Envisat (Environmental Satellite) ASAR (Advanced Synthetic Aperture Radar) images and L-band ALOS (Advanced Land Observing Satellite) PALSAR (Phased Array type L-band Synthetic Aperture Radar) data were employed to recover the Earth’s surface evolution during the period between 2007 and 2009 using InSAR time series techniques. Similar subsidence patterns can be observed in the overlapping area of the ASAR and PALSAR mean velocity maps with a maximum radar line of sight rate of ~170 mm·year−1. The west subsidence is modeled for ground water volume change using Mogi source array. Geological control by major faults on the east subsidence is analyzed. Storage coefficient of the east subsidence is estimated by InSAR displacements and temporal pattern of water level changes. InSAR has proven a useful tool for subsidence monitoring and displacement interpretation associated with underground water usage.