For Plover Cove Dam hundreds of permanent scatterers were successfully found and millimetric non-linear time series movements were detected on the road of the dam and embankments of the reservoir. We correlated the PS-InSAR results with the water level data of the reservoir. Using highly sampled dataset with external data about the water level of the reservoir it is possible to estimate its influence on the dam deformation.
Water level data has been applied into the original dataset, in order to estimate their influence. Majority of PS points over the dam shows strong correlation with water levels.
After correction of correlation with water level fluctuations, the residual signal shows a slowly approaching but linear trend, especially at the dam side closer to the reservoir.
Very probably, this side is linearly subsiding – the subsidence velocity is estimated to be around 3 mm/year in satellite LOS. Obviously this linear model of correlation with water level data seems simplified – a non-linear characteristics has to be searched for.
