Evaluating Subsurface Risk for Archaeological Heritage Through Ground-Penetrating Radar Surveys: The Case Study of Bisya and Salūt Archaeological Site (Sultanate of Oman)

We present the results of a Ground-Penetrating Radar (GPR) survey conducted at the archaeological site of Bisya and Salūt (Sultanate of Oman), aimed at assessing archaeological risk associated with the planned infrastructural development of the site. The survey employed a dual-frequency GPR system with a survey rugged cart to adapt to the varying conditions of the area. The survey was designed around a scale-adaptive grid strategy, across three sectors, combining medium- and low-definition acquisitions over broader areas to identify zones with low archaeological potential, with a high-density grid near previously excavated structures. Data interpretation was integrated with Geographic Information System (GIS)-based spatial mapping, allowing the definition of a parametric risk indicator for subsurface archaeological potential derived from radar facies characterisation and point-by-point anomaly analysis along GPR profiles. Within the area of higher density, the method successfully mapped buried alignments suggestive of anthropogenic features. The results confirmed the effectiveness of GPR as a predictive tool for archaeological prospection, particularly when combined with spatial analysis. Overall, this study highlights the feasibility of incorporating non-invasive methods into heritage protection strategies, contributing to the sustainable development and planning of archaeological landscapes.