| Title |
Displacement Analysis of the Hwanggang Dam Using PS-InSAR |
| Authors |
김주훈(Kim, Joo Hun);김지성(Kim, Ji Sung) |
| DOI |
https://doi.org/10.12652/Ksce.2025.45.5.0557 |
| Keywords |
Sentinel-1A/1B;PS-InSAR;황강댐;변위 Sentinel-1A/1B;PS-InSAR;Hwanggang dam;displacement |
| Abstract |
Monitoring dam displacement is crucial for preventing catastrophic losses to infrastructure and human life. The purpose of this study was to analyze the time-series displacement of the Hwanggang Dam in North Korea by applying the PS-InSAR technique using satellite SAR data. A total of 105 Sentinel-1 C-band SLC images acquired from the ascending orbit (2017-2024) and 80 images from the descending orbit (2017?2021) were utilized in this study. Interferometric pairs were generated under a baseline constraint of 100 m, and pixels exhibiting a coherence value equal to or greater than 0.75 were identified as persistent scatterers to estimate dam displacement. The analysis results showed that the average displacement in the ascending orbit was 1.4 mm for the concrete dam and -4.5 mm for the fill dam. In the descending orbit, the average displacement was 0.6 mm for the concrete dam and -5.7 mm for the fill dam. In both satellite orbits, the concrete dam exhibited very small displacements, indicating structural stability. The fill dam section exhibited a gentle subsidence trend of several mm/yr. To validate the displacement analysis, we analyzed data from both ascending and descending orbits over the same area and confirmed the consistency of displacement trends between the two orbits, indirectly confirming the validity of satellite-based displacement analysis. This study demonstrated the effectiveness of a satellite-based indirect monitoring system for infrastructure with limited access. Future research is needed to enhance the reliability of displacement analysis by combining ascending and descending orbits to decompose vertical and horizontal components. |