Lithology-controlled subsidence and seasonal aquifer response in the Bandung basin,Indonesia, observed by synthetic aperture radar interferometry |
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| Institution: | 1. Institute of Earth Sciences Jaume Almera, ICTJA–CSIC, Lluis Sole i Sabaris s/n, 08028 Barcelona, Spain;2. Department of Geosciences, National Taiwan University, Taipei 106, Taiwan;3. Institute of Oceanography, National Taiwan University, Taipei 106, Taiwan;1. Department of Earth Sciences, National Central University, Jhongli, Taiwan;2. Department of Geological and Environmental Sciences, State University of New York at Binghamton, Binghamton, USA;3. Department of Earth Sciences, University of Southern California, Los Angeles, USA;4. Earthquake Prediction Research Center, Tokyo University, Tokyo, Japan;1. Géosciences Montpellier, Montpellier University, CNRS, France;2. LIA ADEPT, MOST Taiwan, CNRS France;3. Department of Earth Sciences, National Central University, Chung-Li, Taiwan;4. Domaines Océaniques Laboratory, Bretagne Occidentale University, IUEM, France;5. GéoAzur Laboratory, Nice Sophia-Antipolis University, France;6. CEFREM, Perpignan University, CNRS, France;7. Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi, Taiwan |
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| Abstract: | Land subsidence in the Bandung basin, West Java, Indonesia, is characterized based on differential interferometric synthetic aperture radar (DInSAR) and interferometric point target analysis (IPTA). We generated interferograms from 21 ascending SAR images over the period 1 January 2007 to 3 March 2011. The estimated subsidence history shows that subsidence continuously increased reaching a cumulative 45 cm during this period, and the linear subsidence rate reached ～12 cm/yr. This significant subsidence occurred in the industrial and densely populated residential regions of the Bandung basin where large amounts of groundwater are consumed. However, in several areas the subsidence patterns do not correlate with the distribution of groundwater production wells and mapped aquifer degradation. We conclude that groundwater production controls subsidence, but lithology is a counteracting factor for subsidence in the Bandung basin. Moreover, seasonal trends of nonlinear surface deformations are highly related with the variation of rainfall. They indicate that there is elastic expansion (rebound) of aquifer system response to seasonal-natural recharge during rainy season. |
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| Keywords: | Groundwater extraction Subsidence characterization DInSAR IPTA Seasonal variation |
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