台州地区地下水储量变化的CORS网反演

Inversion of groundwater storage changes in Taizhou region using CORS network

为了突出连续运行基准站(CORS)网对地下水储量监测能力,该文基于CORS网的高精度大地高时间序列,联合大气、土壤水和海平面变化等地表质量负荷数据,根据地球负荷形变理论,采用移去恢复技术,反演了台州地区2017年1月—2019年6月的地下水储量变化,并与GRACE-FO监测结果进行对比。结果表明:(1)CORS网反演的地下水储量具有明显的季节性与年际特征,秋冬季节地下水储量较少,春夏季节地下水储量增多,年变化幅度达到1000 mm。(2)在空间分布上,台州中东部地区及沿海地区变化量,比西北部的内陆地区变化量大。(3)与GRACE结果相比,除局部区域存在差异,整体上时空变化趋势具有较高一致性。在小区域的地下水储量反演中,CORS网具有可行性。

In order to highlight the ability of continuously operating reference station(CORS) network to monitor groundwater storage, this paper based on high-precision geodetic height time series of CORS network, combined with surface mass load data such as atmospheric, soil water and sea level changes, and based on earth load deformation theory, the groundwater storage changes in Taizhou area from January 2017 to June 2019 were inverted by using removal and restoration technology, and then compared with GRACE-FO monitoring results. The results showed that:(1)the groundwater storage retrieved by CORS network had obvious seasonal and interannual characteristics. The groundwater storage were less in autumn and winter, and the groundwater storage increased in spring and summer, with an annual variation of 1 000 mm.(2)In terms of spatial distribution, the amount of change in the central and eastern regions and the coastal areas was greater than that of the inland areas in the northwest.(3)Compared with GRACE results,in addition to local region differences,the overall trend of spatio-temporal changes had a higher consistency.In the inversion of groundwater storage in a small area,the CORS network was feasible.