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Monitoring open-cast mines better than before
admin
2020-11-04
发布年2020
语种英语
国家美国
领域地球科学 ; 气候变化
正文(英文)
IMAGE

IMAGE: Mean deformation rates over the Hambach open-pit mine in Northrhine-Westphalia, Germany, retrieved from different SAR satellites. Negative and positive values correspond to subsidence and uplift in the line-of-sight (LOS) direction... view more 

Credit: Wei Tang, Mahdi Motagh, Wei Zhan

When it comes to safety in open-cast mining, soil stability is one of the most critical factors. Settlement of the ground or slipping of slopes poses a great risk to buildings and people. Now Mahdi Motagh from the German Research Centre for Geosciences GFZ, in cooperation with Chinese scientists, has evaluated data from the Sentinel 1 mission of the European Union's Copernicus program and thus demonstrated new possibilities for monitoring mining areas. The three researchers used a special radar method, the Synthetic Aperture Radar Interferometry (InSAR), to investigate lignite regions in North Rhine-Westphalia in Germany. They reported on this in the "International Journal of Applied Earth Observation and Geoinformation".

The InSAR method in itself is not new and is used in many places to detect ground deformations, whether after earthquakes or subsidence due to the overexploitation of underground water reservoirs. However, it had one decisive disadvantage: InSAR satellites such as ERS or ENVISAT only record a certain region on average once a month or less. "With its six-day repeat time interval and small orbital tube, the Sentinel 1 mission provides SAR data that help us to investigate hazards in very specific mining areas in Germany in much greater detail in terms of time and space than before," reports Mahdi Motagh, "and we can do this in near real time." The mission is also able to provide a comprehensive overview of the situation in the mining industry. By combining the results of this new technology with other on-site measurements and high-resolution SAR systems such as the German TerraSAR-X, the geotechnical risk of open-cast mines could be assessed far more completely than before.

The work shows that there is significant land subsidence in the open-cast mining areas of Hambach, Garzweiler and Inden. The reason for this is the compaction process of overburden over refilled areas with subsidence rates varying between 30-50 centimeters per year over Inden, Hambach and Garzweiler. Satellite data also showed a significant horizontal shift of up to 12 centimeters per year at one mine face. Also the former open pits Fortuna-Garsdorf and Berghein in the eastern part of the Rhenish coal fields, which have already been reclaimed for agriculture, show subsidence rates of up to 10 centimeters per year.

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Original study: Wei Tang, Mahdi Motagh, Wei Zhan: "Monitoring active open-pit mine stability in the Rhenish coalfields of Germany using a coherence-based SBAS method" in International Journal of Applied Earth Observation and Geoinformation; DOI: 10.1016/j.jag.2020.102217

Link: https://www.sciencedirect.com/science/article/pii/S0303243420301720?via%3Dihub

Scientific Contact

Prof. Dr. Mahdi Motagh
Section Remote Sensing and Geoinformatics
Tel.: +49 331 288-1197
Email: mahdi.motagh@gfz-potsdam.de
Twitter: @MahdiMotagh

Media Contact:

Dipl.-Geogr. Josef Zens
Head of Public and Media Relations
Tel.: +49 331 288-1049
Email: josef.zens@gfz-potsdam.de

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.

URL查看原文
来源平台EurekAlert
文献类型新闻
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/300750
专题地球科学
气候变化
推荐引用方式
GB/T 7714
admin. Monitoring open-cast mines better than before. 2020.
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