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• W2015116437 abstract "The pore space of a sediment column (diameter 10 cm, length 20 cm), filled with natural sediments, was imaged with magnetic resonance tomography (MRT) at a spatial resolution of 0.5 × 0.5 × 0.5 mm3. Apart from the evaluation of the resulting images, the statistical evaluation provides additional data to assess the pore size distribution. While the porosity of pores >0.2 mm can be measured directly, for smaller pores a calibration is necessary. Flow and diffusion processes were measured at a spatial resolution of 1.32 × 1.32 × 5 mm3. The time between two measurements of a cross-sectional area is <10 s. The coefficients of molecular diffusion can be measured directly and are in good agreement with data in the literature. Flow was measured in a range of 0.9−40 cm/min. A calibration within one part of the sediment column was performed. The results of the flow investigations are in good agreement with the values obtained from a tracer experiment and from a numerical model. At the given spatial resolution, flow in preferential flow paths and larger pores can be measured individually. Regions of different flow velocities can be mapped. A monitoring of flow processes is possible. Since the method is based on the movement of protons in a magnetic field, no tracer was needed to examine the dynamic processes within the column. We believe that MRT has great potential to fill the gap between lab-scale investigations and field tests by providing reliable data on the pore geometry and the occurring flow velocities." @default.
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• W2015116437 date "2000-08-31" @default.
• W2015116437 modified "2023-09-23" @default.
• W2015116437 title "Direct 3-D Measurement of the Flow Velocity in Porous Media Using Magnetic Resonance Tomography" @default.
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• W2015116437 doi "https://doi.org/10.1021/es991124i" @default.
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