Science Service System

Summary of Proposal HYD1612

TitleMonitoring of land subsidence in Indonesian cities, using a combinationof TerraSAR-X InSAR and continuous GPS
Investigator Hill, Emma - Earth Observatory of Singapore, Division of Earth Sciences, Nanyang Technological University
Team Member
Dr. Andreas, Heri - Institute of Technology Bandung, Geodesy Research Division
Prof Abidin, Hasanuddin - Institute of Technology Bandung, Geodesy Research Division
Dr. Wdowinski, Shimon - University of Miami, Division of Marine Geology and Geophysics
Ms. Chaussard, Estelle - University of Miami, Division of Marine Geology and Geophysics
Dr. Hermawan, Iwan - Nanyang Technological University, Earth Observatory of Singapore
Technical Director Banerjee, Paramesh - Nanyang Technological University, Earth Observatory of Singapore
SummaryWe propose to use a combination of InSAR and continuous GPS data to monitor continued and rapid subsidence in a number of Indonesian cities, with an initial concentration on Jakarta. This study will be the continuation of successful efforts to measure the subsidence using PALSAR InSAR [Chaussard et al., 2012; Figure 1] and campaign GPS [Abidin et al., 2011]. These previous studies have indicated rates of up to 22 cm/yr, a number so high that it is critical to continue monitoring efforts. The societal effects of this subsidence are already being felt; for example, large areas of northern Jakarta are regularly subject to the dangers posed by “rob” (an Indonesian term for inundation of the land by the sea), with roads impassible and entire neighborhoods flooded. Figure 2 gives an illustration of this.Direct damage to buildings and infrastructure is also a serious problem. In the future, the dangers to the community, and the economic impacts, could be huge, with up to 35% of Jakarta’s land area lost to the ocean by 2050 due to the combined effects of subsidence and climate change. The project (including installation of GPS stations and travel for conferences and collaborations) will primarily be funded by existing grants held at EOS (EOS internal grants, and a Singapore National Research Foundation Fellowship held by the PI.

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