Science Service System

Summary of Proposal LAN2475

TitleTemporal subsidence monitoring of Dashengguan Yangtze river bridge based on TerraSARhigh resolution images
Investigator Hui, Yang - Southwest Jiaotong University, Faculty of Geosciences and Enviromental Engineering
Team Members
Professor Qiang, Chen - Southwest Jiaotong University, Faculty of Geosciences and Environmental Engineering
Doctor Yinghui, Yang - Southwest Jiaotong University, Faculty of Geosciences and Enviromental Engineering
SummaryBackground: Yangtze river bridge is located in southwest of Nanjing city, Jiangsu province, China. The length and height of the bridge is 14.8 kilometers and 32 meters, and more than 1.6km across the surface of water, which is the maximum load bridge of high-speed railway in the world. Six railway have been constructed on the bridge include Jinghu high-speed railway, Huhanrong railway and Nanjiang subway, so the stability monitoring of Yangtze river bridge is very important for the safe operation of the railway. At the present, the stability monitoring of large-scale bridge mainly depended on high-precision leveling, but the costing of this work is very high and longer repeated observation cycle, which is bad for long-term monitoring of the bridge. Objectives and Method: Our team try to use high resolution TerraSAR images monitor the stability of Yangtze river bridge, the steel structure of the bridge has better radar scattering characteristics, and the high resolution of TerraSAR image makes the bridge is planar spatial distribution on radar images, which all helpful to detect persistent scatterers. After obtained enough persistent scatterers, we can construct PS network with the persistent scatterers on the bridge and Nanjing city, then Los deformation can be calculated at different times. And we also can obtain absolute deformation of the bridge when joint leveling data. At the last, we can analyze the stability of Yangtze river bridge based on the temporal deformation data. Data requirements: So, the high resolution TerraSAR images cover the Yangtze river bridge are required, the scope of longitude is eastern longitude 118 degrees 30 minutes to 43 minutes, and north latitude 31 degrees 52 minutes to 32 degrees 03 minutes. The images acquisition time should between 2010.01 and 2014.01, and minimum number of temporal images must more than 15. Deliverables: The deliverables will include temporal deformation of Yangtze river bridge, the deformation accuracy assessment from temporal TerraSAR images. Funding: Our research will be supported by the Natural Science Foundation of China (Grant Nos. 41072220, 51178404),National Basic Research Program of China (973 Program) under Grant 2012CB719901 and Fundamental Research Funds for the Central Universities (Grant Nos.SWJTU09CX010, SWJTU11ZT13, SWJTU12ZT07).

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