TY - EJOU
AU - Li, Gongsheng
AU - Yao, De
AU - Jiang, Hengyi
AU - Jia, Xianzheng
TI - Numerical Inversion of a Time-Dependent Reaction Coefficient in a Soil-Column Infiltrating Experiment
T2 - Computer Modeling in Engineering \& Sciences
PY - 2011
VL - 74
IS - 2
SN - 1526-1506
AB - This paper deals with an inverse problem of determining a time-depen -dent reaction coefficient arising from a disturbed soil-column infiltrating experiment based on measured breakthrough data. A purpose of doing such experiment is to simulate and study transport behaviors of contaminants when they vertically penetrating through the soils. Data compatibility of the inverse problem is discussed showing a sufficient condition to the solution's monotonicity and positivity with the help of an adjoint problem. Furthermore, an optimal perturbation regularization algorithm is applied to solve the inverse problem, and two typical numerical examples are presented to support the inversion algorithm. Finally, transport model of a positive solute ion in the soil-column is investigated based on the researches to the inverse problem. An optimal reaction coefficient is determined by the inversion algorithm, and the inversion is of numerical uniqueness. The inversion results not only coincide with data compatibility of the inverse problem, but also agree with the real breakthrough data.
KW - solute transport
KW - advection-dispersion equation
KW - inverse problem
KW - determination of time-dependent reaction coefficient
KW - soil-column experiment
KW - optimal perturbation regularization algorithm
KW - numerical inversion
KW - numerical uniqueness
DO - 10.3970/cmes.2011.074.083