combination with precise leveling and psinsar observations to quantify pumping-induced land subsidence in central taiwan
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2015
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Abstract
Choushui River Fluvial Plain (CRFP) is located in the western central Taiwan,
where the geomaterials are composed of alluvial deposits. Because the CRFP area
receives highly variable rainfall in wet and dry seasons, the groundwater becomes
the main resource of residential water. The precise
leveling monitoring from 1970s indicated that the coastal areas of CRFP had
been threatened by serious pumping-induced land subsidence. On the basis of
relatively accurate measurements of precise leveling measurements, we used cokriging technique to incorporate a number of InSAR images to
quantify the surface deformation in CRFP. More specifically, the
well-developed Persistent Scatterer InSAR (PSI) was employed to process 34
Envisat images (2005–2008) and the results of PSI was then used for
improving the spatial resolution of data from precise leveling. The results
of cokriging estimation indicate whether the rate or the area of the land
subsidence slows down gradually from 2005 to 2008. The subsidence in the
northern part of CRFP was influenced by the groundwater decline in aquifer III, and the
southern part was influenced by groundwater decline in aquifer II and III. The cokriging
estimation was also comparable with continuous GPS data, and their
correlation coefficient is 0.9603 and the root mean square is 10.56 mm yr−1.
| Reference Key |
lu2015proceedingscombination
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|---|---|
| Authors | ;C. H. Lu;C. F. Ni;C. P. Chang;C. P. Chang;J. Y. Yen;W. C. Hung |
| Journal | gruppe interaktion organisation zeitschrift fur angewandte organisationspsychologie |
| Year | 2015 |
| DOI |
10.5194/piahs-372-77-2015
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| URL | |
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