Brumadinho Dam InSAR study: analysis of TerraSAR-X, COSMO-SkyMed and Sentinel-1 images preceding the collapse
Brumadinho Dam InSAR study: analysis of TerraSAR-X, COSMO-SkyMed and Sentinel-1 images preceding the collapse
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布鲁马迪尼奥大坝 InSAR 研究：对倒塌前的 TerraSAR-X、COSMO-SkyMed 和 Sentinel-1 图像进行分析
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
A. Pon
中科院分区：
文献类型：
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作者：
D. Holden;S. Donegan;A. Pon
巴西Brumadinho附近Corrego do Feijao铁矿1号坝的灾难性故障引起了人们对类似地点可用的监测技术范围的极大关注，包括卫星干涉合成孔径雷达（InSAR）。卫星InSAR是一种遥感技术，它使用卫星图像来探测毫米级位移。本文利用四组卫星合成孔径雷达（SAR）数据的高分辨率和低分辨率图像，介绍了Brumadinho遗址在大坝坍塌前的InSAR结果。本研究的目的是提供一组可能有助于提高对崩塌背后机制的理解的结果，并了解在崩塌之前是否有InSAR可以在检测任何异常位移信号方面发挥作用。
The catastrophic failure of Dam I at the Corrego do Feijao iron ore mine near Brumadinho, Brazil has brought significant attention to the range of monitoring techniques available for similar sites, including satellite Interferometric Synthetic Aperture Radar (InSAR). Satellite InSAR is a remote sensing technique that uses satellite imagery to detect millimetre scale displacements. This paper presents InSAR results covering the Brumadinho site, for the time period leading up to the dam collapse, using both high and low resolution imagery from four sets of satellite synthetic aperture radar (SAR) data. The goal of this study is to provide a set of results that may help to improve the understanding of the mechanisms behind the collapse and to understand if there was a role that InSAR could have played in detecting any anomalous displacement signals before the collapse.
Four sets of satellite SAR images are available and have been analysed in this study. These include two from the Sentinel-1 (S1) satellite constellation, which have a lower resolution (20 m), and two from the higher resolution (3 m) TerraSAR-X (TSX) and COSMO-SkyMed (CSK) satellite constellations. The high resolution CSK and TSX measurements also provide a much greater level of detail on the dam that can be used to distinguish local trends.
Some subtle signals are observed on the lower portion of the dam wall in the year leading up to the collapse, however, these are not statistically significant based solely on the level of noise present in the InSAR results. At the top of the wall and inside of the enclosure, significant signal is present, as expected for a structure of this type.