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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/nhess-2017-234
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2017-234
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

  05 Jul 2017

05 Jul 2017

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This preprint was under review for the journal NHESS but the revision was not accepted.

Detection of Land Subsidence due to Excessive Groundwater Use Varying with Different Land Cover Types in Quetta valley, Pakistan Using ESA-Sentinel Satellite Data

Waqas Ahmad1, Minha Choi2, Soohyun Kim1,3, and Dongkyun Kim1 Waqas Ahmad et al.
  • 1Department of Civil Engineering, Hongik University, Mapo-gu, Seoul, 04066 Korea
  • 2Water Resources and Remote Sensing Laboratory, Department of Water Resources, Graduate School of Water Resources, Sungkyunkwan University, Suwon, 440-746, Korea
  • 3National Disaster Management Institute, Jongga-ro, Jung-gu, Ulsan, Korea

Abstract. In this study, we show that land subsidence in Quetta valley, Pakistan is caused by exploitation of groundwater based on the analysis of European Space Agency (ESA) Sentinel satellite data. For this, we performed interferometry analysis using twenty nine Sentinel-1 SAR images to obtain twenty eight interferograms of land subsidence for the period between 16 Oct 2014 and 06 Oct 2016. Then, the land subsidence was compared with the land cover of the study area that was derived from Sentienl-2 multispectral images. The results reveal that, for the period of two years, the entire study area experienced highly uneven land subsidence with its magnitude ranging between 10 mm to 280 mm. The spatial pattern of land subsidence showed a high correlation with that of land covers. While urban and cultivated area with high groundwater extraction showed great amount of land subsidence, barren and seasonally cultivated area did not show as much land subsidence.

Waqas Ahmad et al.

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Waqas Ahmad et al.

Waqas Ahmad et al.

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