Earth and rock-filled dam monitoring by high-resolution X-band interferometry: Gongming dam case study

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Li, T.; Motagh, M.; Wang, M.; Zhang, W.; Gong, C. et al.: Earth and rock-filled dam monitoring by high-resolution X-band interferometry: Gongming dam case study. In: Remote Sensing 11 (2019), Nr. 3, 246. DOI:

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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.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Fakultät für Bauingenieurwesen und Geodäsie

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pos. country downloads
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1 image of flag of Germany Germany 67 62.04%
2 image of flag of United States United States 17 15.74%
3 image of flag of China China 11 10.19%
4 image of flag of Ukraine Ukraine 2 1.85%
5 image of flag of Mongolia Mongolia 2 1.85%
6 image of flag of Taiwan Taiwan 1 0.93%
7 image of flag of Turkey Turkey 1 0.93%
8 image of flag of Iraq Iraq 1 0.93%
9 image of flag of India India 1 0.93%
10 image of flag of Austria Austria 1 0.93%
    other countries 4 3.70%

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