By Chen Zhu

This ebook discusses the applying of geochemical versions to environmental perform and stories, by using a number of case reviews of real-world environmental difficulties, reminiscent of acid mine drainage, pit lake chemistry, nuclear waste disposal, and landfill leachates. In every one instance the authors in actual fact outline the environmental risk in query; clarify how geochemical modeling may also help resolve the matter posed; and propose the reader easy methods to arrange enter records for geochemical modeling codes and interpret the consequences by way of assembly regulatory specifications.

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No spatial compositional change is included in the models (Lichtner, 1996; Steefel and MacQuarri, 1996). Recent development of coupled reactive transport models can deal with reactions in real spatial and time scales as well as physical transport processes such as advection and hydrodynamic dispersion (see Chapter 10). Thus these reaction path models’ applications to environmental problems lie in the special situations discussed above. 6). If one fluid is evolved from another, the compositional differences can be accounted for by the minerals and gases that leave or enter that packet of water: initial water + reactants → final water + products Another possibility is that the final water may evolve from the mixing of two initial waters, and the mixing fractions then become part of the mass balance calculations.

That is, are the underlying conceptual models which the coded equations simulate adequate? Do they actually “represent” natural processes? It would seem to follow, then, that after verification and validation, a model could be used for predictive purposes. If only things were that simple. A useful discussion of these concepts is given by Nordstrom (1992). We present only a synopsis. Theoretically, verification of a computer code is an achievable task, given sufficient time, funding, and manpower.

Similarly, it is well known that adsorption of solutes on mineral surfaces is extremely important. 1 2 Both areas are subjects of intense and rapidly advancing research at the present time, and it is certain that modeling practice will change considerably in the years ahead. So the question arises as to the usefulness of geochemical modeling at our present state of understanding. To put it another way, is it worthwhile performing the modeling if we know that the results will be inaccurate in some absolute sense?

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