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Improvement of complex and refractory ecological models: Riverine water quality modelling using evolutionary computation

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  • Kim, MinHyeok
  • Park, Namyong
  • (Bob) McKay, R.I.
  • Shin, Haisoo
  • Lee, Yun-Geun
  • Jeong, Kwang-Seuk
  • Kim, Dong-Kyun

Abstract

Complex environmental models have frequently suffered from large discrepancies between prediction and reality, inaccurate quantification of multivariate parameters, and difficulties in dealing with nonlinearities. We introduce an interdisciplinary project combining an ecological river-process model and evolutionary optimisation of model parameters, resulting in tools for more effective water resource management. The aim is to more tightly integrate the expert's knowledge and the evolutionary system through an iterated cycle of knowledge refinement and evolutionary search. This requires new methods to specify the expert knowledge in ways that can be integrated into the search. We used an evolutionary algorithm to optimise the multivariate values of the model parameters while retaining their acceptability, verifying that their ranges and values were consistent with ecological knowledge and constraints. The best model had a significantly lower predictive error than the initial process model parameterised from literature estimates. Its error was also over 50% less than those of the purely empirical modelling methods of linear regression and neural network learning. We conclude that combining process knowledge with evolutionary learning can play an important role in ecological modelling.

Suggested Citation

  • Kim, MinHyeok & Park, Namyong & (Bob) McKay, R.I. & Shin, Haisoo & Lee, Yun-Geun & Jeong, Kwang-Seuk & Kim, Dong-Kyun, 2014. "Improvement of complex and refractory ecological models: Riverine water quality modelling using evolutionary computation," Ecological Modelling, Elsevier, vol. 291(C), pages 205-217.
    • Handle: RePEc:eee:ecomod:v:291:y:2014:i:c:p:205-217
    DOI: 10.1016/j.ecolmodel.2014.07.021
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    References listed on IDEAS

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    1. Juran Ahmed & Arup Sarma, 2005. "Genetic Algorithm for Optimal Operating Policy of a Multipurpose Reservoir," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 19(2), pages 145-161, April.
    2. Kim, Dong-Kyun & Cao, Hongqing & Jeong, Kwang-Seuk & Recknagel, Friedrich & Joo, Gea-Jae, 2007. "Predictive function and rules for population dynamics of Microcystis aeruginosa in the regulated Nakdong River (South Korea), discovered by evolutionary algorithms," Ecological Modelling, Elsevier, vol. 203(1), pages 147-156.
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