| Title | Surface deformation observed by InSAR shows connections with water storage change in southern Ontario |
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| Author | Li, J; Wang, S ;
Michel, C; Russell, H A J |
| Source | Journal of Hydrology: Regional Studies vol. 27, 100661, 2019 p. 1-11, https://doi.org/10.1016/j.ejrh.2019.100661  Open Access |
| Image |  |
| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20190594 |
| Publisher | Elsevier |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Ontario |
| NTS | 30L/11; 30L/12; 30L/13; 30L/14; 30M/03; 30M/04; 30M/05; 30M/06; 30M/11; 30M/12; 30M/13; 30M/14; 31D/04; 40I/09; 40I/10; 40I/11; 40I/13; 40I/14; 40I/15; 40I/16; 40P; 41A/01; 41A/02 |
| Area | Great Lakes; Lake Erie; Lake Ontario |
| Lat/Long WENS | -81.7500 -79.2500 44.2500 42.5333 |
| Subjects | hydrogeology; surficial geology/geomorphology; geophysics; Science and Technology; Nature and Environment; deformation; subsidence; water loading; groundwater resources; groundwater regimes; remote
sensing; satellite imagery; radar methods; geodesy; satellite geodesy; geodetic networks; surface waters; lakes; water levels; precipitation; sediments; glacial deposits; tills; muds; sands; postglacial deposits; Gravity Recovery and Climate
Experiment (GRACE); Lake Erie Basin; Lake Ontario Basin; Great Lakes Basin; Global positioning systems; glaciofluvial sediments; glaciolacustrine sediments; anthropogenic deposits; Data processing; Trends |
| Illustrations | geoscientific sketch maps; tables; satellite images; time series; plots |
| Program | Remote Sensing Science |
| Released | 2019 12 31 |
| Abstract | Study region: A 10,000 km2 area of southwestern Ontario within the Lake Erie and Lake Ontario basins of the Laurentian Great Lakes basin, Ontario, Canada, a humid northern hydrogeological setting with
abundant precipitation and recharge, and a stable Paleozoic sedimentary bedrock overlain by glacial sediment forming a relatively uncompressible sedimentary succession.
Study focus: Examining land surface deformation in southern Ontario and its
connection with water storage change.
New hydrological insights: The surface deformation, observed from a set of 48 Radarsat-2 InSAR images over five years from Jan. 2013 to Sept. 2017 presents a subsidence trend of 1?10 mm/year and a seasonal
variation of up to 20 mm over the region. The InSAR results are confirmed by the GPS measurements at six locations over the region. The surface deformations were compared to the water storage data derived from GRACE satellites, in-situ water levels
of the Great Lakes, and precipitation data in the study area. The results indicate that the multi-year trend and seasonal variations in surface deformation are correlated to water storage changes, suggesting that the surface deformation in southern
Ontario could be caused by water loading. |
| Summary | (Plain Language Summary, not published)
The surface deformation, observed from a set of 40 Radarsat-2 InSAR images over five years (Jan. 2013 - Sept. 2017), presents a subsidence trend from
2013 to 2017 with a mean annual rate of 4 mm and a seasonal variation of up to 20 mm over the region. The subsidence varies with locations ranging from 1 mm/year to 10mm/year. The InSAR results are confirmed by the GPS measurements in both long term
declining trend and seasonal variations. The surface deformations were compared to the water storage data derived from GRACE satellites, in-situ water levels of the Great Lakes, and monthly precipitation data in the study area. The results indicate
that the multi-year trend and seasonal variations in surface deformation are consistent with water storage changes, suggesting that the surface deformation in southern Ontario could be caused by the water loading. |
| GEOSCAN ID | 321919 |
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