DONGXIAO ZHANG. Academic Press, San Diego, CA. 2002. Hardcover, 350 pp. $89.95. ISBN: 0-12-779621-5.

Hydrogeological variables of a groundwater system, for example, the hydraulic head and contaminant concentration, vary with space and time. The variability is due to spatial heterogeneities of geological materials and temporal variations of the internal and external input to and output from the groundwater system, such as groundwater recharge, evapotranspiration, and base flow to streams. These spatial heterogeneities and temporal variations are difficult if not impossible to characterize. As a result, modeling of fluid flow and solute transport in the subsurface environment is prone to errors...

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