The Dynamics of Mining Subsidence in Knurow Area in Poland Derived from SAR Interferometry and Topographic Data

Tomasz Wojciechowski(1)

(1) Faculty of Earth Sciences, University of Silesia , ul. Bedzinska 60, 41-200 Sosnowiec, Poland

Abstract

The paper presents the results of GIS analysis concerned in Knurow town in Upper Silesian Coal Basin in Poland. The strong terrain surface changes are caused here by underground exploitation of hard coal which continued since 100 years. Based on Digital Terrain Models (DEM) constructed from archival and present topographic maps, the 18 meters of lowering due to subsidence and 25 m of relative uplift have been archived. The relative uplift was observed at recent mine-waste storages and was identified as the effect of waste dumping. The map of surface changes was then compared with geological maps and maps of underground mining to explain the spatial distribution of subsidence. Thanks to SAR interferometry the information about surface displacements of short time range have been received and the areas of recent subsidence of 10cm/35 days have been identified. The interferometric data have been compared with leveling data and maps of underground exploitation to explain the dynamics of subsidence. This analysis show exact agreement among parameters of subsidence troughs and the geological conditions of exploited strata. The presented analysis have been completed with the maps of changes in hydrological conditions of the area and other surface damages. Presented analysis shows the effectiveness of applied GIS approach to evaluate the anthropogenic impact on the terrain surface. SAR interferometry plays very important role as the independent tool which allows to effectively map the recent subsidence and study its dynamics.

 

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