Computational issues in anthropogenic land subsidence prediction
M. Ferronato, G. Gambolati, G. Pini, P. Teatini
Dept. Mathematical Methods and Models for Scientific
Applications, University of Padova, Padova, Italy
ABSTRACT
Anthropogenic land subsidence due to fluid withdrawal is usually predicted with the
aid of Finite Elements (FE) in both the coupled and the uncoupled formulations. Nowadays
FE models to simulate land motion have become quite a well-established technique,
requiring advanced tools to improve the overall quality of the analysis. Present
computational issues include: a) the implementation of cost-effective and accurate
iterative solvers relying on unsymmetric preconditioned conjugate gradients properly
stabilized to make the use of coupled models attractive in large complex geological
stractures; b) the development of special interface elements yielding a more accurate
stress/strain analysis in faulted porous media; c) the use of sthocastic models to address
the mechanical heterogeneity of the depleted formations. Representative numerical
examples are shown and discussed to illustrate the importance of the above computational
issues.
