InSAR detection of residual settlement of an ocean reclamation engineering project: a case study of Hong Kong International Airport |
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| Authors: | Qing Zhao Hui Lin Wei Gao Howard A Zebker Albert Chen Kin Yeung |
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| Institution: | (1) College of Resources and Environmental Sciences, Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai, 200062, People’s Republic of China;(2) Institute of Space and Earth Information Science, Chinese University of Hong Kong, Hong Kong, People’s Republic of China;(3) Department of Electrical Engineering, Stanford University, Stanford, CA 94305-9505, USA |
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| Abstract: | Man-made land or islands that are reclaimed from the sea are suitable for building airports, harbors, and industry parks for
material transportation because of their broad air and land spaces. However, the reclaimed foundation settlement process is
of public concern, including the continuous impact of ocean processes on its stability. The majority of the buildings and
facilities of Hong Kong International Airport (HKIA) are built on a reclaimed foundation. The reclaimed foundation has been
in residual settlement since completion of the filling project in 1994. In this study, we use persistent scatterer interferometry
(PSI) and ENVISAT (European Satellite) advanced synthetic aperture radar (ASAR) data to detect the residual settlement rates
from 19 April 2006 to 9 January 2008. We use ground truth data to develop empirical correction models for correcting systematic
biases in the ASAR PSI-detected settlement rates. The corrected data follow the Lorentz distribution well, implying that the
residual settlement process is dominated by two modes or categories of settlement rates. The first category represents a relatively
stable state and the second category represents a continuous settlement state. A ground settlement rate map of HKIA shows
that an area of the Passenger Terminal Building and an area of the Southern Runway are two relatively stable areas. There
are two major continuous settlement areas. One covers the airport Midfield. Another is along the coastline, implying that
attention should be paid to impacts of ocean processes on the stability of airport foundations. |
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