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Continuous Risk Assessment of Structures in Areas of Ground Deformation Susceptibility by Persistent Scatterers InSAR: Preliminary Results of the Rio-Antirio Bridge (Greece) case

Issaak Parcharidis(1), Michael Foumelis(2), Penelope Kourkouli(1), Urs Wegmuller(3), Evangelos Lagios(2) and Vassilis Sakkas(2)

(1) Harokopio University of Athens, El. Venizelou 70, Athens, 17671, Greece
(2) University of Athens, panepistimioupolis, Zographou, 15784, Greece
(3) GAMMA Remote Sensing, Worbstr. 225, Gumligen, CH-3073, Switzerland

Abstract

Ground motion is the surface expression of different physical events like subsidence, earthquakes, landslides. In many cases the deformation is of anthropogenic cause relate to water and oil pumping, slopes undercut by roads, mining etc. Construction and operation of engineering structures and generally of big projects in urban or in rural areas can be seriously affected by ground conditions leading to casualties and financial losses. From hazard monitoring to risk assessment by monitoring both ground deformation and human structures stability (e.g. dams, specific buildings etc) is of great importance contributing to prevention and management of these risks. This study aims at testing a regular and continuous deformation monitoring over a structure itself and the surrounding area using Persistent Scatterers InSAR and thus assessing the stability of the structure. As pilot application the new bridge Rion-Antirio, western Greece, an important infrastructure and its environment shall be monitored. It is the longest cable stayed bridge in world of 2.250 m. It is located in the northwest edge of Peloponnese facilitating the communication and transportation between Greece and the Western Europe through the Patra’s harbor. The area of the strait presents a combination of hazards like absence of stiff seabed, strong seismic activity, tectonic movements, which make the area of great ground deformation susceptibility and the bridge an element in risk. Point target reflectors with stable radar response over time will be selected. Through the use of point targets, interferometric pairs also with long baselines can be used, allowing achieving a good temporal coverage and high accuracy of the measurements.A particular effort concerns the detection of point targets on the bridge. The main objectives of the study are (i) mapping of past deformation (spanning over more than 15 years of archive data), (ii) Continuous monitoring, according to the revisit period of the satellite, attempting to create a regular updating of displacement maps, (iii) producing deformation history charts of for predefined prioritized point targets on the bridge as well as for the surrounding area showing not only the rate of deformation but also its temporal variation.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry