Earth and Rock-Filled Dam Monitoring by High-Resolution X-Band Interferometry: Gongming Dam Case Study

  • 发布时间:[2021-07-28] 来源:[学院] 点击量:[390]
作者: Li, T (Li, Tao); Motagh, M (Motagh, Mahdi); Wang, MZ (Wang, Mingzhou); Zhang, W (Zhang, Wei); Gong, CL (Gong, Chunlong); Xiong, XN (Xiong, Xunan); He, JP (He, Jinping); Chen, LL (Chen, Lulu); Liu, JN (Liu, Jingnan)
来源出版物: REMOTE SENSING  : 11  : 3  文献号: 246  DOI: 10.3390/rs11030246  出版年: FEB 1 2019 
摘要: Middle-sized earth- and rock-filled dams with clay cores continue to settle by approximately 0.5-1.5% of their height for approximately 1-3 years after their construction phase. This paper investigates the use of high-resolution spaceborne Synthetic aperture Radar (SAR) interferometry to monitor this settlement process, with the case of the Gongming dam in China. The varieties of slope foreshortening and stretching in the radar coordinates are attributed to the radar's local incidence angle and the dam's slope heading, which are analysed in detail. Focusing on the embankment slope settlement analysis, the equations for calculating foreshortening and the line-of-sight deformation decomposition are derived in detail for the adjustment and data fusing. The scattering characteristics of different materials on the dam surface are analysed, including the grass slope, concrete slope, top road (crest), top wall, step, and ditch. According to the analysis of the precipitation data from a local meteorological station, the coherence losses on the slopes are mainly caused by surface moisture. Both the TerraSAR-X Spotlight (TSX-SL) data and the COSMO-SkyMed Strip Mode (CSK-SM) data are analysed by the stacking method to assess the slopes' deformations. The TSX-SL data results show the highest rate of settlement as 2 cm/yr on the top of the dam slope, consistent with the clay core shrinking process. The CSK-SM data show a similar trend in the lower part of the dam slope but underestimate the deformation in the upper part of the slope.

版权所有: 武汉大学卫星导航定位技术研究中心 联系地址: 中国·武汉市珞瑜路129号 邮编: 430079 E-mail:gnsscenter@whu.edu.cn Tel/Fax:027-68778971/68778971(办公室) 技术支持:武汉楚玖科技有限公司