Science Service System

Summary of Proposal HYD3486

TitleDam Monitoring and modeling through satelliteSAR data
Investigator Tessari, Giulia - University of Padua, Geosciences
Team Member
Dr. Floris, Mario - University of Padua, Geosciences
Mr. Riccardi, Paolo - Sarmap SA, R&D
Dr. Pasquali, Paolo - Sarmap SA, R&D
SummaryAnalyses of surface deformation can help to define the spatio-temporal evolution of areas, structures and infrastructures threatened by hazardous phenomena. To this end, space-borne Synthetic Aperture Radar (SAR) data provides direct measures of surface deformations. Specific techniques to handle SAR data have been recently applied to monitor not only natural hazardous phenomena, such as earthquakes, subsidence and landslides, but even structural health of buildings and infrastructure. The large spread of these techniques is supported by the non-invasiveness of radar signals, the possibility to cover vast areas and the availability of a large database of data acquired since the 90s, despite they do not give any indication about the triggering factors and the strain source or the tensile condition of a structure. This project is aimed to use SAR data to monitor dam structural health and, even more, to exploit deformation fields as a starting point to re-create a simplified model, providing preliminary hints about the stress-strain status of the dam. The relevance of this process emerges when environmental or logistic conditions do not allow to monitor dams through traditional geodetic and numerical techniques. In such cases, results obtained from SAR data combined with a modelling stage constitute a reliable diagnostic tool of dam structural health to avoid any extraordinary failure that may lead to loss of lives. The method will be tested on two different real cases, the Mosul dam, the biggest Iraqi dam, and theMullaperiyar dam, a critical Indian dam. The choice of these dams takes into account the different structure design and materials: Mosul dam is an earth-fill embankment-type with a clay-core, while Mullaperiyar dam is a gravity dammade with concrete prepared fromlimestoneand burnt brick powder. The study of these two cases will face the following goals: analysis of satellite SAR data available over the two areas; identification of a model to reproduce each dam deformation behaviour and tensile condition.

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