A modified inverse procedure for calibrating parameters in a land subsidence model and its field application in Shanghai, China

摘要: Land-subsidence prediction depends on an appropriate subsidence model and the calibration of its parameter values. A modified inverse procedure is developed applied to calibrate five parameters in a compacting confined aquifer system using records field data from vertical extensometers corresponding hydrographs. The COMPAC (InvCOMPAC) has been used past for calibrating hydraulic conductivity aquitards, nonrecoverable recoverable skeletal specific storages storage aquifers, initial preconsolidation stress within aquitards. InvCOMPAC increase robustness this study. There are two main differences (MInvCOMPAC). One that smoothed before diagram analysis reduce local oscillation remove abnormal points. robust locally weighted regression method smooth data. other difference Newton-Raphson method, with variable scale factor, conduct computer-based adjustment procedure. MInvCOMPAC then land Shanghai, China. Five aquifers aquitards at 15 multiple-extensometer sites calibrated. Vertical deformation sedimentary layers can be predicted by one-dimensional these calibrated extensometer sites. These could also serve as good values three-dimensional regional models Shanghai.