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• W2049486671 abstract "In most groundwater applications, measurements of concentration are limited in number and sparsely distributed within the domain of interest. Therefore, interpolation techniques are needed to obtain most likely values of concentration at locations where no measurements are available. For further processing, for example, in environmental risk analysis, interpolated values should be given with uncertainty bounds, so that a geostatistical framework is preferable. Linear interpolation of steady-state concentration measurements is problematic because the dependence of concentration on the primary uncertain material property, the hydraulic conductivity field, is highly nonlinear, suggesting that the statistical interrelationship between concentration values at different points is also nonlinear. We suggest interpolating steady-state concentration measurements by conditioning an ensemble of the underlying log-conductivity field on the available hydrological data in a conditional Monte Carlo approach. Flow and transport simulations for each conditional conductivity field must meet the measurements within their given uncertainty. The ensemble of transport simulations based on the conditional log-conductivity fields yields conditional statistical distributions of concentration at points between observation points. This method implicitly meets physical bounds of concentration values and non-Gaussianity of their statistical distributions and obeys the nonlinearity of the underlying processes. We validate our method by artificial test cases and compare the results to kriging estimates assuming different conditional statistical distributions of concentration. Assuming a beta distribution in kriging leads to estimates of concentration with zero probability of concentrations below zero or above the maximal possible value; however, the concentrations are not forced to meet the advection-dispersion equation." @default.
• W2049486671 created "2016-06-24" @default.
• W2049486671 creator A5027897660 @default.
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• W2049486671 date "2010-01-11" @default.
• W2049486671 modified "2023-10-02" @default.
• W2049486671 title "Interpolation of Steady-State Concentration Data by Inverse Modeling" @default.
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• W2049486671 doi "https://doi.org/10.1111/j.1745-6584.2009.00668.x" @default.
• W2049486671 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20070381" @default.
• W2049486671 hasPublicationYear "2010" @default.
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