| Title | InSAR to support sustainable urbanization over compacting aquifers: The case of Toluca Valley, Mexico |
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| Author | Castellazzi, P; Garfias, J; Martel, R; Brouard, C; Rivera, A |
| Source | International Journal of Applied Earth Observation and Geoinformation vol. 63, 2017 p. 33-44, https://doi.org/10.1016/j.jag.2017.06.011  Open Access |
| Year | 2017 |
| Alt Series | Natural Resources Canada, Contribution Series 20182146 |
| Publisher | Elsevier BV |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Program | INRS
Institut national de la recherche scientifique, Centre Eau, Terre & Environnement, Programme de financement |
| Released | 2017 07 26 |
| Abstract | This paper illustrates how InSAR alone can be used to delineate potential ground fractures related to aquifer system compaction. An InSAR-derived ground fracturing map of the Toluca Valley, Mexico, is
produced and validated through a field campaign. The results are of great interest to support sustainable urbanization and show that InSAR processing of open-access Synthetic Aperture Radar (SAR) data from the Sentinel-1 satellites can lead to
reliable and cost-effective products directly usable by cities to help decision-making. The Toluca Valley Aquifer (TVA) sustains the water needs of two million inhabitants living within the valley, a growing industry, an intensively irrigated
agricultural area, and 38% of the water needs of the megalopolis of Mexico City, located 40 km east of the valley. Ensuring water sustainability, infrastructure integrity, along with supporting the important economic and demographic growth of the
region, is a major challenge for water managers and urban developers. This paper presents a long-term analysis of ground fracturing by interpreting 13 years of InSAR-derived ground displacement measurements. Small Baseline Subset (SBAS) and
Persistent Scatterer Interferometry (PSI) techniques are applied over three SAR datasets totalling 93 acquisitions from Envisat, Radarsat-2, and Sentinel-1A satellites and covering the period from 2003 to 2016. From 2003 to 2016, groundwater level
declines of up to 1.6 m/yr, land subsidence up to 77 mm/yr, and major infrastructure damages are observed. Groundwater level data show highly variable seasonal responses according to their connectivity to recharge areas. However, the trend of
groundwater levels consistently range from ?0.5 to ?1.5 m/yr regardless of the well location and depth. By analysing the horizontal gradients of vertical land subsidence, we provide a potential ground fracture map to assist in future urban
development planning in the Toluca Valley. |
| GEOSCAN ID | 310707 |
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