In order to understand the stability and slipping behavior of the slope, in situ investigation and monitoring have been carried out at 12.3K of Nantou County 89 th County Road, Taiwan. The acquired potential sliding depth and range of moving area from the boring logs and inclinometer measurements match with the outcomes from electrical resistivity tomography. The other purpose of this study was to obtain the horizontal displacement field of the landslide at station 12.3K's landslide and its surrounding area using the particle image velocimetry (PIV) technique. The orthophotographs, taken during 2008 and 2012, were analyzed using the PIVview2C. The results show that the maximum horizontal displacement is about 5.5 to 6.1m in this study area. For movements in 2008-2009 and 2010-2012, the major displacement is around 5 to 6.5m. Most of the calculated displacement magnitudes are less than 2.5m in .2009-2010. The major moving direction is toward the azimuth 247.5°-292.5°. The results of PIV analysis can quickly identify the major moving zones and displacement fields compared with traditional methods.

No abstract