Geochemical modeling is an important tool in environmental studies and in the areas of subsurface and surface hydrology pedology water resources management mining geology geothermal resources hydrocarbon geology and related areas dealing with the exploration and extraction of natural resources. The book fills a gap in the literature through its discussion of geochemical modeling which simulates the chemical and physical processes affecting the distribution of chemical species in liquid gas and solid phases. Geochemical modeling applies to a diversity of subsurface environments from the vadose zone close to the Earthâs surface down to deep-seated geothermal reservoirs. This book provides the fundamental thermodynamic concepts of liquid-gas-solid phase systems. It introduces the principal types of geochemical models such as speciation reaction-path or forward inverse- and reactive-transport models together with examples of the most common codes and the best-practices for constructing geochemical models. The physical laws describing homogeneous and heterogeneous chemical reactions their kinetics and the transport of reactive solutes are presented. The partial differential or algebraic equations representing these laws and the principal numerical methods that allow approximate solutions of these equations that can provide useful solutions to model different geochemical processes are discussed in detail. Case studies applying geochemical models in different scientific areas and environmental settings conclude the book. The book is addressed to students teachers other professionals and to the institutions involved in water geothermal and hydrocarbon resources mining and environmental management. The book should prove useful to undergraduate and graduate students postgraduates professional geologists and geophysicists engineers environmental scientists soil scientists hydrochemists and others interested in water and geochemistry. . Language: English