| Title | Land subsidence induced by groundwater pumping, monitored by D-InSAR and field data in the Toluca Valley, Mexico |
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| Author | Calderhead, A I; Martel, R; Alasset, P -J; Rivera, A ; Garfias, J |
| Source | Canadian Journal of Remote Sensing vol. 36, no. 1, 2010 p. 9-23, https://doi.org/10.5589/m10-024 |
| Image |  |
| Year | 2010 |
| Alt Series | Earth Sciences Sector, Contribution Series 20120196 |
| Publisher | Informa UK Limited |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Area | Toluca Valley; Mexico |
| Lat/Long WENS | -101.0000 -99.0000 20.0000 18.0000 |
| Subjects | hydrogeology; stratigraphy; groundwater; groundwater regimes; groundwater resources; groundwater flow; groundwater circulation; subsidence rates; subsidence; hydrologic budget; aquifers; models;
recharge rates; urban planning; urban geology; remote sensing; InSAR |
| Illustrations | location maps; cross-sections; plots; tables; stratigraphic columns |
| Program | Groundwater Geoscience Aquifer Assessment &
support to mapping |
| Released | 2014 06 02 |
| Abstract | Excessive groundwater pumping fromcompressible aquifers leads to land subsidence, potentially causing significant damage to buildings and infrastructure. Differential interferometry is applied to
synthetic aperture radar (SAR) images (DInSAR) of the Toluca Valley, Mexico, with the aim of measuring and monitoring land subsidence. D-InSAR results are verified with field data. Additionally, the different sensors are compared and contrasted. A
total of 30 SAR images from various C-band sensors with dates ranging from December 1995 to May 2008 were used. Forty-four D-InSAR pairs were generated with 31 usable interferograms. ENVISAT ASAR generally had shorter baselines than RADARSAT-1, and
thus more usable interferograms. Verifying InSAR results involved installing and taking measurements from two extensometer systems. The compressible clays compact in a relatively linear fashion, where varying compaction rates are a function of
drawdown and geologic properties. The total maximum subsidence for a point location in the valley between November 2003 and May 2008 is approximately 40 cm. It is estimated that the maximum total subsidence since 1962 is over 2.0 m. |
| GEOSCAN ID | 291834 |
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