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- W2727474859 abstract "Core Ideas Gravity‐driven flow was studied in the presence of lenticular heterogeneity. The importance of finger impingement position on heterogeneities was emphasized. These experiments present a data set for testing of extended Richards' models. Prediction of infiltration in porous media is challenged by finger formation and unstable displacement of the wetting front. We present a systematic experimental study on the effect of packings and infiltration rates on unstable flow into initially dry porous media. We conducted small two‐ and three‐dimensional experiments where water contents were measured with neutron radiography and larger two‐dimensional experiments, which we evaluated by obtaining commonly used finger properties such as width and velocity from image analysis. Our results from experiments in macroscopically homogeneous packings were tested for correspondence with theoretical finger property predictions and are in good agreement. For the smaller experiments, water content profiles including “overshoots” at the finger tips as well as finger properties depending on the packing matched well results reported in the literature. For all homogeneous experiments, we found a strong dependence of finger properties on porosity. Homogeneous experiments served as reference cases for comparison with larger two‐dimensional experiments where heterogeneity was induced by block‐shaped inclusions. Unstable flow propagation in heterogeneous experiments was documented by inclusion fill rates in addition to finger properties. We found a multifaceted finger propagation behavior that depends on the impingement position of instabilities on an inclusion. Thereby, we are able to show that the location of the impingement on an inclusion is crucial to the filling rate of the inclusion and the propagation velocity of the finger. Results from the conducted experiments present a data set for testing of extended Richards' models." @default.
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- W2727474859 date "2017-07-01" @default.
- W2727474859 modified "2023-10-16" @default.
- W2727474859 title "Unstable Infiltration Experiments in Dry Porous Media" @default.
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- W2727474859 doi "https://doi.org/10.2136/vzj2016.10.0092" @default.
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