Near Surface Tilt and pore Pressure Changes Induced by Pumping in Multi-Layered Poroelastic Half-Spaces.

At three sites in Germany, called OE, BV and WD, pump test experiments were conducted. The aim was the observation and ensuing modelling of near surface tilt and pore pressure changes induced by pumping in nearby wells. The observations were carried out with 'bubble tiltmeters' as borehole and platform instruments. The nominal resolution of the instruments was 0.1 µrad. Pore pressure changes in the subsoil were recorded through water level fluctuations in wells by means of pressure transducers with a resolution better than 1mm H2O. The model calculations were carried out with the program POEL. With an assumption of a subsoil model, the program allows an accurate and rapid signal simulation. The models are time resolved and account for multi-layered fully saturated poroelastic half-spaces.