Abstract
This paper provides a summary of the investigations carried out for the preliminary assessment of potential geohazards affecting the archaeological site of Dadan in the Kingdom of Saudi Arabia. The site is characterized by the presence of Cambro-Ordovician sandstone cliffs (Siq formation), which were quarried in ancient times (Dadan/Lihyan kingdom) for building materials. Both the steep quarried portion (Upper Siq) and the gentler underlying slope (Middle Siq) contain tombs of significant archaeological value. Landsliding and erosion are the main geomorphological processes affecting the site, posing risks to the safety of visitors, archaeological workers, and the preservation of the site. The primary processes affecting the rock cliffs, the underlying slope talus, and the tombs were identified using geological and geomechanical surveys, in addition to various geomatic acquisitions. The mechanical properties of the rock formations and discontinuity sets were identified through laboratory testing and in situ surveying, respectively. This information represents the first step in promoting further actions for risk mitigation and site management.
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Coltop3D© semi-automatic discontinuity extraction: a ALS point clouds for the entire cliff and b the stereonet and relative rosette plots. In upper a, the colors correspond to the aspect of the full cliff face (dip angle and dip direction), expressed in terms of hue value and saturation (Metzger et al. 2009), while the lower one is only reporting the selected discontinuities, with colors also corresponding to dip angle and dip direction
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Coltop3D© semi-automatic discontinuity extraction, a combining the UAV-DP and ALS point clouds for the entire cliff and b the relative rosette and stereonet plots. In upper a are the two used data bases; in middle a, the colors correspond to the aspect of the full cliff face (dip angle and dip direction), expressed in terms of hue value and saturation (Metzger et al. 2009), while the lower one is only reporting the selected discontinuities, with colors also corresponding to dip angle and dip direction
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Acknowledgements
The reported activities were carried out thanks to the collaboration between the UNESCO Chair on Prevention and Sustainable Management of Geo-Hydrological Hazards of the University of Florence, the Italian Institute for Environmental Protection and Research (ISPRA), the Sapienza University of Rome, and the University of Milano Bicocca, coordinated by the Royal Commission for AlUla (RCU) and the French Agency for AlUla Development (AFALULA), in the framework of the International Programme on Landslides IPL-259 project “Landslide Risk assessment in AlUla Archaeological sites–Kingdom of Saudi Arabia.” ALS data were provided by the Royal Commission for AlUla. We deeply thank Factum Foundation for making available the TLS survey and Drone photos. LAGIRN laboratory of the University of Bologna, in the person of Dr. Fausto Peddis and Dr. Barbara Ravaglia, is highly acknowledged for the activity of laboratory testing. Jhaed Kamuzaman Abul provided also his help in this stage of the research.
Funding
The field work was funded by the French Agency for AlUla Development (AFALULA), on behalf of the Royal Commission for AlUla (RCU).
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Contributions
Conceptualization and methodology: Daniela Boldini, Giovanni Battista Crosta, Claudio Margottini, and Daniele Spizzichino; formal analysis and investigation: Tommaso Beni, Daniela Boldini, Giovanni Battista Crosta, William Frodella, José Ignacio Gallego, Edoardo Lusini, Claudio Margottini, and Daniele Spizzichino; writing original draft preparation: Tommaso Beni, Daniela Boldini, Giovanni Battista Crosta, William Frodella, José Ignacio Gallego, Edoardo Lusini, Claudio Margottini, and Daniele Spizzichino; writing review and editing: Tommaso Beni, Daniela Boldini, Giovanni Battista Crosta, William Frodella, José Ignacio Gallego, Edoardo Lusini, Claudio Margottini, and Daniele Spizzichino; Supervision: José Ignacio Gallego, Claudio Margottini, and Daniele Spizzichino.
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Appendices
Appendix 1
Core and disk specimens prepared from the Upper Siq unit (Su) samples for the mechanical tests: a from 2020 campaign and b 2021 relatively. See Table 5 for sample dimensions
Appendix 2
Appendix 3
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Beni, T., Boldini, D., Crosta, G.B. et al. Rock instabilities at the archaeological site of Dadan (Kingdom of Saudi Arabia). Landslides 20, 2455–2478 (2023). https://doi.org/10.1007/s10346-023-02122-7
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DOI: https://doi.org/10.1007/s10346-023-02122-7