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Geochemical Models

Ground Water Hydrology

  1. Mário Abel Gonçalves

Published Online: 15 JUL 2005

DOI: 10.1002/047147844X.gw251

Water Encyclopedia

Water Encyclopedia

How to Cite

Gonçalves, M. A. 2005. Geochemical Models. Water Encyclopedia. 5:138–140.

Author Information

  1. Faculdade de Ciências da Universidade de Lisoba, Lisbon, Portugal

Publication History

  1. Published Online: 15 JUL 2005

Abstract

Geochemical models are considered as an abstract representation of natural processes of a system, represented by a set of master variables and described by mathematical equations. The output data of these models is a quantitative representation of an outcome that can be either observable in the natural system or subject to experimental validation. From this definition, the importance of defining proper boundary conditions, and using reliable experimental data on models is discussed. Geochemical models may have as components, chemical reactions (inorganic and/or biological), transport of chemical elements by advection and dispersion, fluid flow, and heat transport. These are the building blocks of geochemical models, which can be divided as: speciation-solubility, reaction-path, inverse mass balance, and coupled reaction-transport models. Finally, model validation and usefulness is shortly discussed.

Keywords:

  • computer codes;
  • thermodynamic databases;
  • solubility-speciation models;
  • reaction-path models;
  • inverse models;
  • coupled reactive-transport models