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Summary of Proposal GEO0295

TitleInterferometric deformation monitoring of a water management construction project in the Ruhr area
Investigator Knospe, Steffen - Clausthal University of Technology, Inst. of Geotechnical Engineering
Team Member
Dr.-Ing. Jakobs, Hans-Willi - Emscher Genossenschaft / Lippe Verband (EG/LV), Department of Mining Technology / Surveying
SummaryThe objective of the project is the investigation of applicability and application-oriented utilisation of interferometric results of TerraSAR-X data to derive risks of stability in a water management construction project along the river Emscher in Germany. The major task is the acquisition and observation of vertical displacements. Along an alignment of about 50 km, in cooperation with EG/LV we can help to detect and evaluate areas of risk because of vertical displacements caused by neighbouring mine activities or effects of abandoned mining fields. In this connection we will analyse the causes of the displacement on the basis of the area-wide results of Differential SAR Interferometry (DInSAR). In contrast, we would observe movements of single objects with the Interferometric Point Target Analysis (IPTA) technique. Both DInSAR and IPTA will be used to monitor ground movements in a selected region before and during the construction works of the new water channel. The use of interferometric techniques within the monitoring of vertical displacements is well documented and therefore a state-of-the-art technology. In this case new aspects have to be considered. In the selected areas, the locations with residual subsidence after the closure of underground coal mines are unknown. In some areas uplifts can appear at the surface because of the flooding of abandoned underground mines. A time series of interferometric TerraSAR-X data (Stripmap-mode, single polarisation, 3.3 m resolution, 30 km swath width) will be requested. The data will be analysed using the more conventional differential SAR Interferometry as well as using the point target based interferometric approach IPTA, which was developed by GAMMA and already successfully applied to C- and L-band SAR data. As decorrelation is expected for the X-band frequency, furthermore the high phase-to-deformation sensitivity is expected to complicate the interpretation of differential interferometric phase in the case of higher deformation gradients. But on the other hand there is a very short revisit time of 11 days, so that we can detect higher deformation gradients theoretical better than with C-band data with a repeat cycle of 35 days. But the most important aspect is that the deformation monitoring potential will benefit from the high spatial resolution of TerraSAR-X. For the investigation we would like to obtain a significant stack of data to evaluate and demonstrate the potential of TerraSAR-X for land surface deformation monitoring. The validation of interferometric results will be conducted with terrestrial measurement data and corner reflectors. Furthermore we will do a comparison with C-band data of the satellite ENVISAT for derivation of comparable statements as to availability, informational value and quality of TerraSAR-X data. The proposed project will make an important contribution for the operational usage of TerraSAR-X data for deformation monitoring in the future. The proposed activity is the content of a submitted and approved project in the DLR call to the preparation of use of TerraSAR-X data.

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