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Adjoint sensitivity analysis of contaminant concentrations in water distribution systems / Roseanna M. Neupauer in Journal of engineering mechanics, Vol. 137 N° 1 (Janvier 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.31-46 Titre : Adjoint sensitivity analysis of contaminant concentrations in water distribution systems Type de document : texte imprimé Auteurs : Roseanna M. Neupauer, Auteur Année de publication : 2011 Article en page(s) : pp.31-46 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Water  distribution  systems  Sensitivity  analysis  Water  pollution  Mathematical  models  Adjoint  state. Résumé : Sensitivity analysis is used to determine how a system state or a model output changes due to a change in the value of a system parameter or a model input. We present the adjoint approach for determining the sensitivity of the concentration of a contaminant in a water distribution system to a change in a system parameter such as the location of the source of contamination, the reaction rate of the contaminant, and others. With the adjoint method, the sensitivity of the model output to any number of parameters can be obtained with one simulation of the adjoint model. If the number of parameters of interest exceeds the number of model outputs for which the sensitivity is desired, the adjoint method is more efficient than traditional direct methods of calculating sensitivities. We develop the adjoint equations for water quality in a water distribution system, verify the adjoint-based sensitivity equation using an analytical example, and demonstrate the numerical calculation of adjoint sensitivities using EPANET. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p31_s1?isAuthorized=no [article] Adjoint sensitivity analysis of contaminant concentrations in water distribution systems [texte imprimé] / Roseanna M. Neupauer, Auteur . - 2011 . - pp.31-46. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.31-46 Mots-clés : Water  distribution  systems  Sensitivity  analysis  Water  pollution  Mathematical  models  Adjoint  state. Résumé : Sensitivity analysis is used to determine how a system state or a model output changes due to a change in the value of a system parameter or a model input. We present the adjoint approach for determining the sensitivity of the concentration of a contaminant in a water distribution system to a change in a system parameter such as the location of the source of contamination, the reaction rate of the contaminant, and others. With the adjoint method, the sensitivity of the model output to any number of parameters can be obtained with one simulation of the adjoint model. If the number of parameters of interest exceeds the number of model outputs for which the sensitivity is desired, the adjoint method is more efficient than traditional direct methods of calculating sensitivities. We develop the adjoint equations for water quality in a water distribution system, verify the adjoint-based sensitivity equation using an analytical example, and demonstrate the numerical calculation of adjoint sensitivities using EPANET. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p31_s1?isAuthorized=no