| Photogrammetry based dam safety inspection: Application and insight |
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학술지명 CDA 2025 Annual Conference
저자 박동순
발표일 2025-10-01
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This study explores the application of drone photogrammetry for 3D reality modeling of two large dams, assessing its practicality for safety inspections and proposing methodologies for its use. The feasibility of generating high-quality 3D models under real-world constraints, such as significant height differences, water surfaces, electromagnetic interference, and steep slopes, was examined. Results confirmed that planar double-grid mission flights, supplemented by manual photography, achieved models with an average GSD of less than 2.5 cm/pixel. Drone photogrammetry enabled high-precision visualization and photogrammetric analysis of hard-to-access areas, including upstream reservoir slopes, spillways, and intake towers. The resulting digital data allowed for quantitative measurements (elevation, coordinates, length, area, and volume) and facilitated longitudinal and transverse profile extraction from 3D models. These profiles are effective for deformation monitoring and safety reviews. A case study of the SYG Dam spillway demonstrated that drone photogrammetry increased inspection productivity by 48% compared to conventional methods. This highlights its potential to enhance the efficiency and reliability of dam safety inspections through digitalization. Overall, the study confirms the strong applicability of drone photogrammetry for dam safety inspections and its potential to improve productivity and data reliability in future practices. |