中文版
Events

Monitoring urban subsidence due to groundwater extraction with PS- and DS-InSAR

Release time:March 31, 2015 /

Date:Apr.1,2015

Time:8:30 AM

Venue:F708,New Main Building

Abstract:

Urban subsidence due to groundwater extraction has been a major challenge to the sustainable development of many cities in China (e.g. Tianjin) and around the world (e.g. Bandung in Indonesia). In order to monitor urban subsidence over large area in a cost-effective fashion, we have combined state-of-the-art DS-InSAR (distributed scatterer InSAR) with PS-InSAR (permanent scatterer InSAR) and applied the technique in measuring subsidence in both Bandung of Indonesia and the Gippsland Basin of Australia. The results have been published in the top-ranking journal Remote Sensing of Environment.

This talk will start with a brief introduction of various satellite interferometric synthetic aperture radar (InSAR) techniques. Then focusing on the interpretation of InSAR results over a long period of time for Bandung and Gippsland. In particular, how the results of subsidence are compared with ground survey, groundwater data and geomechanical modelling results. A total of 54 satellite images collected between 2002 and 2011 and 138 images acquired between 2006 and 2011 are used to study Bandung and Gippsland, respectively.

Introduction of thespeaker:

Dr Linlin Ge is currently an Associate Professor of remote sensing and earth observation in the School of Civil and Environmental Engineering at the University of New South Wales (UNSW), Sydney, Australia. He has been studying earth observation techniques since 1985. Among many other prestigious awards, A/Professor Ge and his team’s work to support the Sichuan Earthquake rescue effort won them the highly prestigious JK Barrie Award for Overall Excellence at the 2008 Asia-Pacific Spatial Excellence Awards. He was named "NSW Scientist of the Year 2009" in the category Physics, Earth Sciences, Chemistry and Astronomy for his work in near real-time satellite remote sensing.

He received his BEng (1st Hons) in Optical Engineering from the Wuhan Technical University of Surveying and Mapping (1985), MSc in Crustal Deformation from the Institute of Seismology (1988), and PhD in GPS and remote sensing from the UNSW (2001). In 1997-1998, he was a postdoctoral research fellow in the Meteorological Research Institute of the Japan Meteorological Agency sponsored by the Science and Technology Agency of Japan.