Auswirkungen von Messunsicherheiten bei der Korngrößenanalyse auf die Berechnung des Durchlässigkeitsbeiwertes

Grain size analyses are often used for the high-resolution characterization of hydraulic conductivity (K) and its variation in space. Resulting K values are then frequently used in hydrogeological modeling. In consideration of the variety of formulas to determine K from grain size data, several publications exist that evaluate the performance of these formulas. However, neither the degree of reproducibility nor the effects of measuring inaccuracy on the determination of K from grain size data has yet been evaluated. In this study, data from several ring analyses show that measuring inaccuracies during grain size analyses lead to strong differences in effective grain size diameters and hence, calculated K values. The effects depend on the sample composition and the approach to determine the effective grain size diameter. However, a direct comparison between methods indicated that the variability of K is mainly influenced by strong differences of K estimates between formulas.