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TitleLand subsidence induced by groundwater pumping, monitored by D-InSAR and field data in the Toluca Valley, Mexico
AuthorCalderhead, A I; Martel, R; Alasset, P -J; Rivera, A; Garfias, J
SourceCanadian Journal of Remote Sensing vol. 36, no. 1, 2010 p. 9-23,
Alt SeriesEarth Sciences Sector, Contribution Series 20120196
Mediapaper; on-line; digital
File formatpdf
AreaToluca Valley; Mexico
Lat/Long WENS-101.0000 -99.0000 20.0000 18.0000
Subjectshydrogeology; 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
Illustrationslocation maps; cross-sections; plots; tables; stratigraphic columns
ProgramAquifer Assessment & support to mapping, Groundwater Geoscience
AbstractExcessive 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.