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Simulating pumping-induced regional land subsidence with the use of InSAR and field data in the Toluca Valley, Mexico |
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| Authors: | AI Calderhead R TherrienA Rivera R MartelJ Garfias |
| Institution: | a Institut national de la recherche scientifique - Centre Eau, Terre, et Environment, 490 de la Couronne, Québec, Canada G1K 9A9 b Département de géologie et de génie géologique, Université Laval, Québec, Canada G1K 7P4 c Geological Survey of Canada, Natural Resources Canada, 490 de la Couronne, Quebec, Canada G1K 9A9 d Universidad Autónoma del Estado de México, Facultad de Ingeniería (CIRA), Cerro de Coatepec, s/n, C.U., Toluca, MEX 50130, Mexico e Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA |
| Abstract: | A multidisciplinary approach is presented here for quantifying land subsidence in a heavily pumped aquifer system with complex stratigraphy. The methodology consists in incorporating Terzaghi’s 1D instantaneous compaction principle into a 3D groundwater flow model that is then applied and calibrated to reproduce observed hydraulic heads and compaction for the Toluca Valley, Mexico. Differential Interferometric Synthetic Aperture Radar (D-InSAR), a generated 3D-geological model, extensometers, monitoring wells, and available literature are used to constrain the model. The D-InSAR measured subsidence, extensometers, and numerical simulations of subsidence agree relatively well. Simulations show that since regional subsidence began in the mid 1960s there has been up to 2 m of subsidence in the industrial corridor, where heavy pumping and thick clay layers are found. This study shows that an approach using various sources of data is useful in estimating and constraining the vertical component of the inelastic skeletal specific storage. |
| Keywords: | Regional land subsidence 1-D compaction InSAR Toluca Mexico HydroGeoSphere model |
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