时序InSAR水库形变监测应用研究

Application Research on Time⁃Series InSAR Reservoir Deformation Monitoring

河口村水库作为黄河下游防洪工程体系的重要组成部分,准确快速地获取水库时空形变具有重要的意义。合成孔径雷达干涉测量具有高精度、大范围、时空连续性等优势,为水库形变监测提出了一种新方法。选取覆盖河口村水库2020年1月15日—2020年12月4日的24景Sentinel-1A升轨影像,结合水库环境的特殊性和复杂性,采用适合实际需求的时序SBAS-InSAR技术,获取了水库的时序形变信息,并重点研究后坝区形变特性。通过地面GNSS监测数据和实地考察,验证了InSAR技术对水库监测具有较高的适用性,为后续水库的稳定性评价和黄河下游大堤防洪压力评价提供数据支撑。

Hekoucun Reservoir is an important part of the flood control engineering system in the lower reaches of the Yellow River.Accurate and quick derivation of the deformation field in the reservoir with high temporal and spatial resolution is of great significance.Synthetic aperture radar interferometry has the advantages of high precision,large range,and spatiotemporal continuity,and proposes a new method for res⁃ervoir timing monitoring.This paper selected 24 Sentinel⁃1A orbit⁃raising images covering Hekoucun Village Reservoir from January 15,2020 to December 4,2020,and combined the particularity and complexity of the reservoir environment to develop time series SBAS⁃InSAR tech⁃nology suitable for actual needs.The time series deformation information of the reservoir was obtained and the deformation characteristics of the rear dam area were mainly studied.Through ground GNSS monitoring data and field investigation,it was verified that InSAR technology has high applicability for reservoir monitoring,and can provide data support for the stability evaluation of subsequent reservoirs and the flood control pressure evaluation of the levee in the lower reaches of the Yellow River.