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Monitoring of Surface Deformation in Open Pit Mine Using DInSAR Time-Series: A Case Study in the N5W Iron Mine (Carajas, Brazil) using TerraSAR-X data

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Mura, Jose C. ; Paradella, Waldir R. ; Gama, Fabio F. ; Santos, Athos R. ; Galo, Mauricio ; Camargo, Paulo O. ; Silva, Arnaldo Q. ; Silva, Guilherme G. ; Notarnicola, C ; Paloscia, S ; Pierdicca, N
Número total de Autores: 11
Tipo de documento: Artigo Científico
Fonte: SAR IMAGE ANALYSIS, MODELING, AND TECHNIQUES XIV; v. 9243, p. 12-pg., 2014-01-01.
Resumo

We present an investigation of surface deformation using Differential SAR Interferometry (DInSAR) time-series carried out in an active open pit iron mine, the N5W, located in the Carajas Mineral Province (Brazilian Amazon region), using 33 TerraSAR-X (TSX-1) scenes. This mine has presented a historical of instability and surface monitoring measurements over sectors of the mine (pit walls) have been done based on ground based radar. Two complementary approaches were used: the standard DInSAR configuration, as an early warning of the slope instability conditions, and the DInSAR time-series analysis. In order to decrease the topographic phase error a high resolution DEM was generated based on a stereo GeoEye-1 pair. Despite the fact that a DinSAR contains atmospheric and topographic phase artifacts and noise, it was possible to detect deformation in some interferometric pairs, covering pit benches, road ramps and waste piles. The time-series analysis was performed using the 31 interferometric pairs, which were selected based on the highest mean coherence of a stack of 107 interferograms, presenting less phase unwrapping errors. The time-series deformation was retrieved by the Least-Squares (LS) solution using an extension of the Singular Value Decomposition (SVD), with a set of additional weighted constrain on the acceleration deformation. The atmospheric phase artifacts were filtered in the space-time domain and the DEM height errors were estimated based on the normal baseline diversity. The DInSAR time-series investigation showed good results for monitoring surface displacement in the N5W mine located in a tropical rainforest environment, providing very useful information about the ground movement for alarm, planning and risk assessment. (AU)

Processo FAPESP: 10/51267-9 - Detecção e monitoramento de estabilidade de taludes e deformações superficiais em mina a céu aberto através de técnicas avançadas de interferometria diferencial de radar: uma avaliação na mina de ferro N4 (Carajás) utilizando dados do satélite TerraSAR-X
Beneficiário:Waldir Renato Paradella
Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE