Stability Analysis and Results of the Landslide MonitoringDatum in the Three Gorges Reservoir Area

Objective Focusing on the limitations of conventional methods,a new method for testing the stabilityof landslide monitoring network for long and narrow areas was studied.The process was divided intothree steps:Firstly,the relatively stability points were identified in the ITRF frame;Secondly,thereference points displacement was calculated in the local reference frame as defined by relatively stabilepoints;Thirdly,a displacement significance test was used to analyze the stability of these referencepoints.Using GPS observations(2008-2011)of a landslide monitoring network in the Three Gorgesreservoir area,the stability of all reference points was tested:finding moved reference points duringthree years of high water impoundment,with a horizontal displacement of the moved reference pointsof more than 4cm,with a maximum of 79.4cm.The displacement direction of unstable referencepoints was physically inspected along with the geographical environment,revealing that they wereconsistent with the results obtained from the proposed testing method.