인공위성 영상레이더를 이용한 멕시코시티 시계열 지반침하 관측 = Monitoring of a Time-series of Land Subsidence in Mexico City Using Space-based Synthetic Aperture Radar Observations

다국어 초록 (Multilingual Abstract)

Anthropogenic activities and natural processes have been causes of land subsidence which is sudden sinking or gradual settlement of the earth’s solid surface. Mexico City, the capital of Mexico, is one of the most severe land subsidence areas which are resulted from excessive groundwater extraction. Because groundwater is the primary water resource occupies almost 70% of total water usage in the city. Traditional terrestrial observations like the Global Navigation Satellite System (GNSS) or leveling survey have been preferred to measure land subsidence accurately. Although the GNSS observations have highly accurate information of the surfaces’ displacement with a very high temporal resolution, it has often been limited due to its sparse spatial resolution and highly time-consuming and high cost. However, space-based synthetic aperture radar (SAR) interferometry has been widely used as a powerful tool to monitor surfaces’ displacement with high spatial resolution and high accuracy from mm to cm-scale, regardless of day-or-night and weather conditions. In this paper, advanced interferometric approaches have been applied to get a time-series of land subsidence of Mexico City using four-year-long twenty ALOS PALSAR L-band observations acquired from Feb-11, 2007 to Feb-22, 2011. We utilized persistent scatterer interferometry (PSI) and small baseline subset (SBAS) techniques to suppress atmospheric artifacts and topography errors. The results show that the maximum subsidence rates of the PSI and SBAS method were -29.5 cm/year and -27.0 cm/year, respectively. In addition, we discuss the different subsidence rates where the study area is discriminated into three districts according to distinctive geotechnical characteristics. The significant subsidence rate occurred in the lacustrine sediments with higher compressibility than harder bedrock.

참고문헌 (Reference)

• 1 홍상훈, "공간해상도에 따른 위성 영상레이더 위상간섭기법 긴밀도 분석" 대한원격탐사학회 29 (29): 389-397, 2013
• 2 López-Quiroz, P, "Time series analysis of mexico city subsidence constrained by radar interferometry" 69 (69): 1-15, 2009
• 3 Tavenas, F, "The behaviour of embankments on clay foundations" 17 (17): 236-260, 1980
• 4 Carrera-Hernández, J.J, "The basin of mexico aquifer system: Regional groundwater level dynamics and database development" 15 (15): 1577-1590, 2007
• 5 Cabral-Cano, E, "Space geodetic imaging of rapid ground subsidence in mexico city" 120 (120): 1556-1566, 2008
• 6 Yunjun, Z, "Small baseline insar time series analysis: Unwrapping error correction and noise reduction" 133 : 104331-, 2019
• 7 Milliman, J., "Sea-level rise and coastal subsidence: Causes, consequences, and strategies Vol. 2" Springer Science and Business Media 1996
• 8 Hanssen, R.F, "Radar interferometry: Data interpre -tation and error analysis Vol. 2" Kluwer Academic Publishers 2001
• 9 Ferretti, A, "Permanent scatterers in sar interferometry" 39 (39): 8-20, 2001
• 10 Pepe, A, "On the generation of ers/envisat dinsar timeseries via the sbas technique" 2 (2): 265-269, 2005
• 11 Park, S. -W., "Nonlinear Modeling of Subsidence From a Decade of InSAR Time Series" 48 (48): 2021
• 12 Chaussard, E, "Land subsidence in central mexico detected by alos insar time-series" 140 : 94-106, 2014
• 13 Poland, J.F, "Land subsidence due to withdrawal of fluids" 2 : 187-270, 1969
• 14 D’Appolonia, D.J, "Initial settlement of structures on clay" 97 (97): 1359-1377, 1971
• 15 Waltham, A, "Ground subsidence" Blackie and Son 202-, 1989
• 16 Gambolati, G, "Geomechanics of subsurface water withdrawal and injection" 51 (51): 3922-3955, 2015
• 17 Leroueil, S, "Construction pore pressures in clay foundations under embankments, Part II:Generalized behaviour" 15 (15): 66-82, 1978
• 18 Dinesh, S, "Consolidation of soils" Siddaganga Institute of Technology 2011
• 19 López-Acosta, N.P, "Characterization of soil permeability in the former lake texcoco, mexico" 11 (11): 113-124, 2019
• 20 Díaz-Rodríguez, J., "Characterisation and engineering properties of mexico city lacustrine soils" 1 : 725-755, 2003
• 21 Berardino, P, "A new algorithm for surface deformation monitoring based on small baseline differential sar interferograms" 40 (40): 2375-2383, 2002