A study on time lags between groundwater changes and land subsidence based on GRACE and InSAR data
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摘要: 河西地区地下水利用比重不断上升导致地下水位显著下降, 引起了局部地区地面沉降。研究河西地区地下水变化与地面沉降滞后性对当地水资源管理、土地利用规划和农业发展具有重要意义。利用GRACE与GLDAS数据得到研究区2010—2017年地下水变化速率, 结合监测井实测数据验证了反演地下水变化数据的可靠性, 利用小基线集合成孔径雷达干涉测量(small baseline subset interferometry synthetic aperture Radar, SBAS-InSAR)技术得到局部沉降区2014年10月—2017年6月的地表形变速率, 并用永久散射体合成孔径雷达干涉测量(persistent scatters interferometry synthetic aperture Radar, PS-InSAR)技术对结果进行对比验证, 运用快速傅里叶变换和时滞相关性分析对地下水变化与地表沉降数据解算分析。结果表明, 临泽、甘州、凉州、金川沉降区地面沉降较地下水变化滞后时间分别为74～86 d, 61～80 d, 80～99 d, 74～99 d; 相关系数分别在0.541～0.593, 0.589～0.689, 0.600～0.750, 0.543～0.630之间。研究结果可为河西地区水资源管理、土地利用规划和农业发展提供科学依据。Abstract: The increasing dependence on groundwater in the Hexi region has led to a significant drop in the groundwater table, which has induced land subsidence in some areas. Studying the relationship between groundwater changes and land subsidence hysteresis in the Hexi region holds great significance for local water resource management, land use planning, and agricultural development. This study determined the changing rate of groundwater in the study area from 2010 to 2017 using the GRACE and GLDAS data and verified the reliability of the inverted groundwater changes by combining measured data from monitoring wells. Then, this study derived the surface deformation rate of the local subsidence areas from October 2014 to June 2017 using the small baseline subset interferometric synthetic aperture radar (SBAS-InSAR) technique, as well as comparing and validating the results using the persistent scatterer interferometric synthetic aperture radar (PS-InSAR) technique. Finally, this study analyzed the relationship between groundwater changes and surface subsidence data using fast Fourier transform and time-delay correlation analysis. The results indicate that the time lags between land subsidence and groundwater changes were 74~86 d, 61~80 d, 80~99 d, and 74~99 d, respectively in the Linze, Ganzhou, Liangzhou, and Jinchuan subsidence areas, with respective correlation coefficients ranging from 0.541 to 0.593, from 0.589 to 0.689, from 0.600 to 0.750, and 0.543 to 0.630, respectively. The results of this study will provide a scientific basis for water resource management, land use planning, and agricultural development in the Hexi region.
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Key words:
- GRACE /
- SBAS-InSAR /
- PS-InSAR /
- groundwater change /
- land subsidence /
- hysteresis
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