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Summary of Proposal COA1278

TitleMapping subsidence of Khulna, Bangladesh
Investigator Higgins, Stephanie - University of Colorado at Boulder, Geological Sciences
Team MemberNo team members defined
SummaryOBJECTIVE: The objectiveof this project is to map subsidence in and around the city of Khulna,Bangladesh, using TerraSAR-X repeat-pass interferometry. MOTIVATION: TheGanges-Brahmaputra River Delta is the largest river delta in the world. It isformed by the confluence of the Lower Ganges River, the Lower BrahmaputraRiver, and the Meghna River. The delta composes a small part of eastern Indiaand almost the entire country of Bangladesh. More than 150 million people liveon the delta, and this dense population is increasingly at risk from floodingand storm surges. Recent GPS installations on the Ganges Delta (MikeSteckler/BanglaPIRE project) have measured subsidence of up to a centimeter peryear; this subsidence is further endangering an already vulnerable area. The city ofKhulna, Bangladesh, has been identified as the area of fastest subsidence inthe region. However, only one GPS device is installed in Khulna, so it isunclear whether subsidence is being driven by a small, local area of compactingpeat underneath the GPS device, or whether the subsidence is part of a muchlarger pattern driven by tectonics, groundwater removal or hydrocarbon pumping. This studywill use TerraSAR-X repeat-pass interferometry to measure and map subsidencearound the city of Khulna. The fine spatial resolution of TerraSAR-Xinterferometry is expected to shed light on the drivers of subsidence in thisarea of the delta. METHODS ANDDATA REQUIREMENTS: 7TerraSAR-X SAR scenes (spanning 7 months of 2007) will be purchased for aninitial, proof-of-concept examination. Interferograms will be processed withthe software GMTSAR, or with ROI_PAC version 3.1 when it is released. Thefunding source for data is a small grant from Shell Oil Company for $2000,earmarked for a graduate student to purchase data for a dissertation. If theresults of initial processing are promising, $12,000 additional dollars areavailable to purchase the rest of a month time series spanning 2007-presentover the same area. The funding source for these data is NASA grant“Integrating Land-to-Ocean Flux Dynamics: AFocus on Global Change in the Coastal Oceans,” James Syvitski Co-I. DELIVERABLES: None. Theresults of this study may be submitted to a peer-reviewed scientific journalfor publication.

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