Ground‐penetrating radar assessment of the medieval arch bridge of San Antón, Galicia, Spain

Abstract

AbstractSeveral arched masonry bridges are listed historical monuments in Spain, which are valued tourist attractions or local landmarks. They are maintained by several organizations dedicated to the cultural heritage such as the International Council on Monuments and Sites (ICOMOS). Many of these important structures are the oldest constructions still in use within the transportation infrastructure and as a result of the increase in traffic loads and their age they have undergone some structural decay. Ground‐penetrating radar (GPR) has been shown to be valuable in evaluating the state of conservation of the San Antón medieval bridge in order to help preserve its historical character. This bridge was surveyed by using the 200, 250 and 500 MHz antennas. Interpretation and analysis of GPR reflection data were supported by finite‐difference time domain numerical modelling, based on the accurate external geometry obtained with three‐dimensional laser scanning methods. Results show that GPR mapping provides valuable information for detecting an internal structural element used for reinforcement as well as a possible interior hidden arch that remains from ancient times. This information is noteworthy for archaeologists and civil engineers as it can be used to make decisions about stability and for future strengthening measures. Copyright © 2010 John Wiley & Sons, Ltd.