By G. Gambolati, G. Verri (eds.)
In fresh years the research, keep watch over, maintenance, remediation and proper administration of underground assets have got a becoming cognizance in various sectors, together with commercial, specialist and educational environments. the amount describes new advancements in either utilized learn and layout expertise to take care of sustainability of a necessary source (groundwater) that is continually threatened by means of illness due to good waste disposal operations, website reutilization, in depth extraction, unintentional leakage of spill in operating installations and non-point resource pollutants in agriculture. it truly is directed to managers, pros, and researchers operating in any of the parts enthusiastic about the keep an eye on, prediction, and remediation of soil and groundwater contamination.
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Additional info for Advanced Methods for Groundwater Pollution Control
The results from some representative sample problems show that the block SOR asymptotic rate of convergence is very fast if aquifer flow is weakly coupled. In this case, the excellent performances of optimal SOR and Gauss-Seidel tend to coincide (wopt ~ 1). If aquifer flow is strongly coupled, both Gauss-Seidel and optimal SOR converge much slowlier. However, the latter turns out to be one order of magnitude faster than the former. By distinctio~, MCG is computationally superior to SOR in hydraulically coupled systems, b•tt is more computer storage demanding.
All these schemes can be used with various preconditioners, such as incomplete Croute (LU) decomposition. Descriptions of the various algorithms can 'be found in [8, 9, 10, 11]. For the symmetric systems generated by Picard linearization, we nse the incomplete Cholesky conjugate gradient method, ICCG [12, 13]. For small, one-dimensional simulations, a tridiagonal direct solver is available and can be used for both symmetric and nonsymmetric systems. 3 Characteristic Equations and Chord Slope Approximations The nonlinear storage and conductivity terms in equation ( 1) can be modeled nsing varions constitutive or characteristic relations describing the soil hydraulic properties.
5)) can be updated after each iteration to account for the dependence of both hydraulic conductivity and elastic storage coefficient on the effective stress which is in turn related to the hydraulic head. 4. NUMERICAL RESULTS FOR LINEAR PROBLEMS The block iterative strategies have been applied to linear paraus media where a theoretical analysis of the SOR convergence properties can be better performed. Three sample circular multiaquifer systems are used to study the asymptotic rate of convergence of the SOR scheme and to compare the performance of the "coupled" and the new "decoupled" solving strategies.
Advanced Methods for Groundwater Pollution Control by G. Gambolati, G. Verri (eds.)