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<p>The stability of steep rocky slopes is considered as a major challenge in the field of engineering geology, especially in areas where human lives, infrastructure or cultural sites are threatened. Rockfalls, as one of the most sudden and violent forms of ground movements, are exacerbated by factors such as climate change, seismic loading, heavy rainfall, and human activity. The need for early identification of risk zones makes it necessary to use modern monitoring methods. Particularly in sensitive areas, such as the Vrachon Theatre in Vyronas—built within an old quarry and surrounded by steep rocky slopes with obvious signs of instability—special attention is required. Traditional inspection methods often prove time-consuming, costly and present serious limitations in such conditions. The use of Unmanned Aerial Vehicle Systems (UAVs) offers new capabilities in slope documentation and assessment, providing high-resolution data for digital modeling (DSM, DTM, 3D). In this study, 500 aerial photographs were collected with UAVs and, using the Pix4DMapper program, geospatial models of the area were created. In addition, AutoCAD and ArcGISPro software were used for topographic mapping and slope separation, and simulations of possible rockfalls were carried out through the RocFall program. The aim of this work is to assess the hazard, propose stabilization and mitigation measures and demonstrate the usefulness of UAVs as an early warning and decision support tool in geotechnical applications within cities.</p>

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UAV Based Photogrammetry and Rockfall Hazard Assessment at the Vrachon Theatre in Greece

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • N. Vagionakis,
  • K. Diamantis,
  • E. Andreadakis,
  • M. Stavropoulou

摘要

The stability of steep rocky slopes is considered as a major challenge in the field of engineering geology, especially in areas where human lives, infrastructure or cultural sites are threatened. Rockfalls, as one of the most sudden and violent forms of ground movements, are exacerbated by factors such as climate change, seismic loading, heavy rainfall, and human activity. The need for early identification of risk zones makes it necessary to use modern monitoring methods. Particularly in sensitive areas, such as the Vrachon Theatre in Vyronas—built within an old quarry and surrounded by steep rocky slopes with obvious signs of instability—special attention is required. Traditional inspection methods often prove time-consuming, costly and present serious limitations in such conditions. The use of Unmanned Aerial Vehicle Systems (UAVs) offers new capabilities in slope documentation and assessment, providing high-resolution data for digital modeling (DSM, DTM, 3D). In this study, 500 aerial photographs were collected with UAVs and, using the Pix4DMapper program, geospatial models of the area were created. In addition, AutoCAD and ArcGISPro software were used for topographic mapping and slope separation, and simulations of possible rockfalls were carried out through the RocFall program. The aim of this work is to assess the hazard, propose stabilization and mitigation measures and demonstrate the usefulness of UAVs as an early warning and decision support tool in geotechnical applications within cities.