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Monitoring deformation of the pre-landslide in Three Gorges area, China

Qiming Zeng(1), Xiai Cui(1), Jingfa Zhang(2) and Jan-Peter Muller(3)

(1) Peking University, No.5, Yiheyuan Road, Haidian District, 100871, Beijing, China
(2) Inst. Crustal Dynamics of CSA, Xisanqi, Haidian District, Beijing, China
(3) University College London, Holmbury St. Mary, Dorking,, RH5 6NT, London, United Kingdom


Since May 2003, the Three Gorges (TG) dam began to impound water, several big landslides occurred in the area, but the most places we have set up corner reflectors (CR) for monitoring the landslides with SAR interferometry are rather stable without remarkable movements, because Chinese government has invested about 6 billion RMB to take engineering measure to fasten all known risk spots. However on Apr. 25, 2007, it is reported one place, Yemaomian in TG area with a CR is active. We have done inteferometrical processing more than 10 pairs from the data collected by Envisat ASAR from 2004 to 2007 with perpendicular baseline less than 200 meters. We found only a few pairs with very shor baseline and short time difference that has remarkable differential fringes along with Yangtze River, but obviously some fringes could be explained as atmospheric effect. We are trying to use the MERIS data synchronously acquired with ASAR to correct the atmospheric effect caused by precipitatable water vapor. Then the corrected differential pre-landslide deformation would be validated by GPS and other on site measurements.


Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry