UNCERTAINTIES IN POROUS FLOW MODELS

Fluid mechanics models often are described by different equations, which themselves are dependent on different variables. Some models contain experimentally obtained coefficients that could differ from concrete situations. In some cases, certain influences that could affect the results of mathematical-numerical models are excluded. The value and character of the influences often are unknown and are the result of unexpected deviations from the results obtained by the utilized models. Also, fluid mechanics models start with some initial values that are not exact and vary over time. This paper aims to estimate the deviations in the analysis of the results when the values of the parameters in the fluid mechanics models are uncertain, i.e., if their values vary at certain intervals. In this paper, special attention is dedicated to dam-accumulation cases. The results obtained by the utilized methodology suggest that it is possible either to predict the deviations of the models' values in cases of presumed values of the arguments or to determine the accuracy of the arguments in order to obtain predefined values of the models' variations.