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Summary of Proposal GEO0389

TitleHigh resolution DInSAR monitoring of subsidence induced by aquifer exploitation in the Vegas Baja and Media of the Segura river, SE, Spain
Investigator Lopez-Sanchez, Juan M - University of Alicante, DFISTS, EPS
Team Member
Dr Delgado, Jose - Universidad de Alicante, DCTMA
Eng. Tomas, Roberto - Universidad de Alicante, DICOPIU
Dr Ballester-Berman, J. David - Universidad de Alicante, DFISTS
Eng. Vicente, Fernando - Universidad de Alicante, DFISTS
Dr Mallorquí, Jordi - Universitat Politècnica de Catalunya, RSLab, TSC
Dr Broquetas, Antoni - Universitat Politècnica de Catalunya, RSLab, TSC
Dr Lopez-Dekker, Paco - Universitat Politècnica de Catalunya, RSLab, TSC
Eng. Duque, Sergi - Universitat Politècnica de Catalunya, RSLab, TSC
Eng. Monells, Daniel - Universitat Politècnica de Catalunya, RSLab, TSC
SummaryThe project is focused in an area with known subsidence phenomena since 1993. Subsidence is caused by the exploitation of the aquifer system during severe drought periods. This region has been already studied with DInSAR by employing ERS and Envisat-ASAR images, and a number of instrumental measurements are also available. The research is designed with the following OBJECTIVES: - Scientific evaluation of subsidence values retrieved with advanced DInSAR techniques employing TerraSAR-X images. In particular: benefits of high resolution images, higher deformation sensitivity and short revisiting period, possible new error sources appearing at X-band (in contrast with the established knowledge at C-band), etc. - Comparison and synergy between results derived from Envisat-ASAR images and TerraSAR-X images. - Improvement in validation of differential interferometry due to the higher resolution and a better geocoding of the results. - Determination of temporal patterns of deformation in areas closely located to well points. The following actions constitute the METHODOLOGY proposed for this project: 1) Modification of the data formats and algorithms of the interferometric chain and the coherent pixels technique (CPT) to be adapted to TerraSAR-X data. 2) Validation of the subsidence results by comparison with in situ data (extensometers and piezometers) 3) Comparison of subsidence results against values provided by Envisat-ASAR images. Exploration of the synergy between both types of data. 4) Integration in a GIS and analysis: spatial and temporal correlation with terrain features, etc. The following DATA are required for the fulfillment of the project: - TerraSAR-X images acquired in stripmap mode over the same site in a repetitive basis: 11 days cycle and same configuration. Images in both ascending and descending orbits will be requested for measuring also horizontal displacements. - Orbital data of the acquisitions - In situ measurements: ground deformation data (from extensometers and piezometric devices), Continuous Line Ground Settlement measurement devices (four measurements per year), geotechnical properties of underground, geological data, etc. - Daily/monthly rain data, water table depth. - DEM of the study area. The main DELIVERABLES of the project are: - Subsidence maps with fine resolution - Accuracy of the subsidence results provided by this technique and cross-validation with ENVISAT data. - Geological interpretation of the subsidence phenomena - Potential combined technique with the use of both Envisat-ASAR and TerraSAR-X images. With respect to the required funding for paying the acquisition of images, at the moment, images will be paid with funds from an on course R&D project supported by the Spanish Ministery of Science and Education (MEC), ref. TEC2005-06863-C02, but a specific application will be prepared for this proposal, also at national level.

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