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Entropy generation as an environmental impact indicator and a sample application to freshwater ecosystems eutrophication

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  • Diaz-Mendez, S.E.
  • Sierra-Grajeda, J.M.T.
  • Hernandez-Guerrero, A.
  • Rodriguez-Lelis, J.M.

Abstract

Generally speaking, an ecosystem is seen as a complex set, it is composed by different biotic and abiotic parts. Naturally, each part has specifics functions related with mass and energy, those functions have influence between the parts directly and indirectly, and these functions are subjected to the basic laws of thermodynamics. If each part of the ecosystem is taken as thermodynamics system its entropy generation could be evaluated, then the total entropy generation of the ecosystem must be sum of the entropy generation in each part, to be in accordance with the Gouy-Stodola theorem. With this in mind, in this work an environmental indicator, for any kind of ecosystems, can be determined as a function of the ratio of total entropy generation for reference state, for instance a healthy forest; and the entropy generation of new different state of the same ecosystem can take, for instance a deforestation. Thus, thermodynamics concepts are applied to study the eutrophication of freshwater ecosystems; the strategy is based on techniques that integrate assumptions of the methodology of entropy generation inside ecosystems. The results show that if the amount of entropy generation is small respect a reference state; the sustainability of the ecosystem will be greater.

Suggested Citation

  • Diaz-Mendez, S.E. & Sierra-Grajeda, J.M.T. & Hernandez-Guerrero, A. & Rodriguez-Lelis, J.M., 2013. "Entropy generation as an environmental impact indicator and a sample application to freshwater ecosystems eutrophication," Energy, Elsevier, vol. 61(C), pages 234-239.
    • Handle: RePEc:eee:energy:v:61:y:2013:i:c:p:234-239
    DOI: 10.1016/j.energy.2013.09.042
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