Special Section on Remote Sensing for Coupled Natural Systems and Built Environments

Interferometric measurements of ground surface subsidence induced by overexploitation of groundwater

[+] Author Affiliations
Maryam Dehghani, Mohammad Javad Valadan Zoej

K.N.Toosi University of Technology, Faculty of Geodesy and Geomatics, 1346, Vali-Asr Street, Mirdamad Cross, Tehran Iran

Iman Entezam

Geological Survey of Iran, Engineering Geology Group, Azadi Square, Meraj Street, Tehran, Iran

Sassan Saatchi

Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 300-243, Pasadena, CA 91109

Amir Shemshaki

Geological Survey of Iran, Engineering Geology Group, Azadi Square, Meraj Street, Tehran, Iran

J. Appl. Remote Sens. 4(1), 041864 (November 29, 2010). doi:10.1117/1.3527999
History: Received April 24, 2010; Revised November 13, 2010; Accepted November 16, 2010; November 29, 2010; Online November 29, 2010
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Abstract

Precise leveling surveys across southwest of Tehran have revealed a significant subsidence due to the overexploitation of groundwater. In order to monitor the temporal evolution of the deformation, Interferometric SAR time series analysis was applied using ENVISAT ASAR images recorded between 2003 and 2005. Only Interferograms with small temporal baselines are processed to decrease the temporal decorrelation effect caused by the agricultural fields. However, the spatial baselines of the processed interferograms are not as small as in the conventional Small Baseline Subset (SBAS) method. Coherence analysis reveals that the spatial decorrelation is insignificant. However, since the constructed interferograms are affected by topographic artifacts caused by the large spatial baselines, a multi-step procedure was used in order to refine the interferometric phase. Smoothed time series analysis was then carried out to retrieve the atmospheric-error free deformation corresponding to every acquisition time. The mean displacement velocity map extracted from the time series results indicates a maximum subsidence rate of 24 cm/yr. Chronological sequence of the computed deformations for several points located in the subsidence area shows the permanent aquifer system compaction at a long-term constant rate on which the seasonal effects are superimposed. Sustained hydraulic head declines reveal a relatively low correlation with InSAR derived information. Comparison of the subsidence rate to soil type profiles in different parts of the subsidence area was then used to interpret the deformation signal.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Maryam Dehghani ; Mohammad Javad Valadan Zoej ; Iman Entezam ; Sassan Saatchi and Amir Shemshaki
"Interferometric measurements of ground surface subsidence induced by overexploitation of groundwater", J. Appl. Remote Sens. 4(1), 041864 (November 29, 2010). ; http://dx.doi.org/10.1117/1.3527999


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