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Cyprus University of Technology (2020)

Monitoring and assessment of the impact of natural hazards of infrastructure resilience using earth observation techniques

Tzouvaras, Marios

Titre : Monitoring and assessment of the impact of natural hazards of infrastructure resilience using earth observation techniques

Auteur : Tzouvaras, Marios

Université de soutenance : Cyprus University of Technology

Grade : Doctor of Philosophy (PhD) 2020

Résumé partiel
Infrastructure is designed to be operational under normal circumstances and to cope with common natural disruptions such as rainfall, snow and excessive heat. However, extreme natural hazards can lead to severe problems not only at the areas where such events occur, but also at neighbouring regions or even the entire country. The main aim of this PhD thesis is the development of a novel methodology for the identification of areas susceptible to land movements and the systematic monitoring of land displacement at areas of interest in Cyprus, such as areas with critical infrastructure, areas of Cultural Heritage (UNESCO sites) and other urban areas, through Earth Observation (EO) techniques. Freely available Copernicus data such as those from the Sentinel missions and datasets from other Copernicus contributing missions (Landsat TM), as well as open-source European Space Agency (ESA) SNAP software were used in the entire process. Three case study areas were selected based on the site geology and the risk that land movements can cause to the general public, critical infrastructure and to Cultural Heritage monuments. The development of landslide hazard maps was carried out, in one case study area, via the Analytic Hierarchy Process (AHP) methodology, using Landsat ΤΜ imagery. Coherent Change Detection (CCD) and Differential Interferometric SAR (DInSAR) methods, exploiting a series of Sentinel-1 SAR images, were used for monitoring land displacement caused by earthquakes and landslides, affecting different areas in Cyprus. For the calibration of the proposed EO based methodology, and the validation of the results obtained through the DInSAR processing of Sentinel-1 acquisitions, coordinates from the permanent Global Navigation Satellite System (GNSS) stations of the Cyprus Positioning System (CYPOS) network, operated by the Department of Lands and Surveys were used. Présentation

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