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Summary of Proposal LAN1621

TitleMonitoring Earth Surface Fissures Induced by Mining Using High Resolution TerraSAR-X Data
Investigator Bian, Zhengfu - China University of Mining and Technology, Environment Sc. and Spatial inform.
Team Member
Associate Professor Lei, Shaogang - China University of Mining and Technology, School of Environment Science and Spatial informatics
Summary Ground fissure (also known as ground crack or earth fissure), resulting from lasting exploitations of underground mining in large amount, is one kind of geological disasters due to its serious damages to buildings, roads and farmlands. Traditional fissures are mostly monitored using leveling, electronic total station and GPS measurements. However, these methods cost large amount of human and material resources, meanwhile these methods are all point wise measurements, lack of area information. The Synthetic Aperture Radar Interferometry technique has become one of geological disaster monitoring tools, for its economical, efficient, high-precision and large-scale surface deformation monitoring capacities. Although some scientists have applied D-InSAR technology successfully in subsidence monitoring for mining areas, the more harmful surface fissure has hardly ever been monitored by this D-InSAR technology until now. Because surface fissure size is usually smaller than radar image pixel, which cause fissure's exact location and size lost in the moderate resolution SAR images, such as ERS, ENVISAT and ALOS satellites. In our project we will plan to use high spatial resolution and short repeats intervals TerraSAR-X data and D-InSAR & PS-InSAR technology to monitor earth surface fissures in mining area. The higher spatial resolution improves the spatial sampling of the deformation pattern, the shorter repeat interval reduces the amount of deformation occurring between two acquisitions, both of which are advantages comparing with ERS, ENVISAT, ALOS and other moderate resolution SAR images. So a time series of interferometric TerraSAR-X data (High Resolution Spotlight, single polarization, 1m resolution, scene size 5 to 10km (width) x 5km (length)) will be requested. The data will be analyzed using conventional differential SAR interferometry(D-InSAR) as well as using the point target based interferometric approach PS-InSAR. After InSAR processing, we will use GIS technology to study geomorphological features of fissure area, analyze the relationship between surface fissure and topography, and obtain the topography influence law. In addition, we will take Shendong mine as a demonstration area, conduct ecological restoration of demonstration project, and make an assessment to the sustainable development effects of ecological reconstruction. We have "Natural Science Foundation of China" including “Obtaining the Mining Subsidence Parameters at Mountainous Coal Mining Area and Its Accuracy Analysis Based on PS-DInSAR” (51174191) and "Monitoring on Spatial Variation of Soil Moisture Induced by Coal Mining in Arid Area" (51004100) to support our plan, so we have adequate funding to ensure the project finished successfully.

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