By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Researchers detail new data in Environmental Modelling and Software. According to news reporting out of Bilbao, Spain, by VerticalNews editors, research stated, "Three global sensitivity analysis (GSA) methods are applied and compared to assess the most relevant processes occurring in wastewater treatment systems. In particular, the Standardised Regression Coefficients, Morris Screening and Extended-FAST methods are applied to a complex integrated membrane bioreactor (MBR) model considering 21 model outputs and 79 model factors."
Our news journalists obtained a quote from the research from Basque Foundation for Science, "The three methods are applied with numerical settings as suggested in literature. The main objective considered is to classify important factors (factors prioritisation) as well as non-influential factors (factors fixing). The performance is assessed by comparing the most reliable method (Extended-FAST), by means of proposed criteria, with the two other methods. In particular, similarity to results obtained from Extended-FAST is assessed for sensitivity indices, for the ranking of sensitivity indices, for the classification into important/non-influential factors and for the method's ability to detect interaction among factors and to provide results in a reasonable time. It was found that the computationally less expensive SRC method was applied outside its range of applicability (R-2) = (0.3-0.6) < 0.7. Still, the SRC produced a ranking of important factors similar to Extended-FAST. For some variables significant interactions among the factors were revealed by computing the total effect indices S-Ti using Extended-FAST. This means that to obtain reliable variance decomposition and to detect and quantify interactions among the factors, the use of the Extended-FAST is recommended. Regarding the comparison between Morris screening and Extended-FAST a poor agreement was found."
According to the news editors, the research concluded: "In particular, the Morris screening overestimated the number of both important and non-influential factors compared to Extended-FAST for the analysed case study."
For more information on this research see: Global sensitivity analysis in wastewater applications: A comprehensive comparison of different methods. Environmental Modelling & Software, 2013;49():40-52. Environmental Modelling & Software can be contacted at: Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England. (Elsevier - www.elsevier.com; Environmental Modelling & Software - www.elsevier.com/wps/product/cws_home/422921)
Our news journalists report that additional information may be obtained by contacting A. Cosenza, Basque Fdn Sci, IKERBASQUE, Bilbao 48011, Spain. Additional authors for this research include G. Mannina, P.A. Vanrolleghem and M.B. Neumann.
Keywords for this news article include: Spain, Bilbao, Europe, Environmental Modelling and Software
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