Abstract
Transmissive and reflective intensity measurements for visual concentration determinations in 2D flow tank experiments were compared and evaluated for their applicability in the study of flow and transport phenomena. A density-dependent heterogeneous flow experiment was conducted and transmission and reflection images of the dyed saltwater plume were analyzed. A single light source and dark curtains forced the light to pass through the porous media only, thus facilitating the transmission measurements. The reflection images delivered a more homogeneous spatial illumination than the transmission images. Major perturbations of the transmission images were lens flare effects and light dispersion within the bead–water–Plexiglas system which smear the front of the plume. Based on the conducted evaluation of transmissive and reflective intensity measurements, the reflection data delivered more reliable intensity values to derive solute concentrations in intermediate scale flow tank experiments.
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References
Catania F, Massabo M, Valle M, Bracco G, Paladino O (2008) Assessment of quantitative imaging of contaminant distributions in porous media. Exp Fluids 44:167–177
Corapcioglu MY, Chowdhury S, Roosevelt SE (1997) Micromodel visualization and quantification of solute transport in porous media. Water Resour Res 33(11):2547–2558
Detwiler RL, Rajaram H, Glass RJ (2000) Solute transport in variable-aperture fractures: an investigation of the relative importance of Taylor dispersion and macrodispersion. Water Resour Res 36(7):1611–1625
Goswami R, Clement P (2007) Laboratory-scale investigation of saltwater intrusion dynamics. Water Resour Res 43:W04418
Huang W, Smith CC, Lerner DN, Thornton SF, Oram A (2002) Physical modelling of solute transport in porous media: evaluation of an imaging technique using UV excited fluorescent dye. Water Res 3(7):1843–1853
Jones EH, Smith CC (2005) Non-equilibrium partitioning tracer transport in porous media: 2-D physical modelling and imaging using a partitioning fluorescent dye. Water Res 39(20):5099–5111
Konz M, Ackerer P, Meier E, Huggenberger P, Zechner E, Gechter D (2008) On the measurement of solute concentrations in 2-D flow tank experiments. Hydrol Earth Syst Sci 12:727–738
Konz M, Ackerer P, Younes A, Huggenberger P, Zechner E (2009) 2D Stable layered laboratory-scale experiments for testing density-coupled flow models. Water Resour Res 45:W02404. doi:10.1029/2008WR007118
McNeil JD, Oldenborger GA, Schincariol RA (2006) Quantitative imaging of contaminant distributions in heterogeneous porous media laboratory experiments. J Contam Hydrol 84:36–54
Oostrom M, Dane JH, Guven O, Hayworth JS (1992) Experimental investigation of dense solute plumes in an unconfined aquifer model. Water Resour Res 28:2315–2326
Rahman A, Jose S, Nowak W, Cirpka O (2005) Experiments on vertical transverse mixing in a large-scale heterogeneous model aquifer. J Contam Hydrol 80:130–148
Ray SF (2002) Applied photographic optics, 3rd edn. Focal Press
Rezanezhad F, Vogel HJ, Roth K (2006) Experimental study of fingering flow through initially dry sand. Hydrol Earth Syst Sci Discuss 3:2595–2620
Rogers G (1976) Photography in paediatrics. In: Newman A (ed) Photographic techniques in scientific research, vol 2. Academic Press, ISBN 0 12 517960
Schincariol RA, Herderick EE, Schwartz FW (1993) On the application of image analysis to determine concentration distributions in laboratory experiments. J Contam Hydrol 12:197–215
Simmons CT, Pierini ML, Hutson JL (2002) Laboratory investigation of variable-density flow and solute transport in unsaturated–saturated porous media. Transp Porous Media 47:15–244
Swartz CH, Schwartz FW (1998) An experimental study of mixing and instability development in variable-density systems. J Contam Hydrol 34:169–189
Theodoropoulou MA, Karoutsos V, Kaspiris C, Tsakiroglou CD (2003) A new visualization technique for the study of solute dispersion in model porous media. J Hydrol 27(1–4):176–197
Wildenschild D, Jensen KH (1999) Laboratory investigations of effective flow behavior in unsaturated heterogeneous sands. Water Resour Res 35:17–27
Acknowledgments
The authors are grateful to Dr. Lukas Rosenthaler of the Imaging and Media Lab, University of Basel who contributed significantly to the image analysis method. Further, we acknowledge the valuable comments of three anonymous referees. This study was financed by the Schweizer Nationalfond 200020-109200.
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Konz, M., Ackerer, P., Huggenberger, P. et al. Comparison of light transmission and reflection techniques to determine concentrations in flow tank experiments. Exp Fluids 47, 85–93 (2009). https://doi.org/10.1007/s00348-009-0639-0
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DOI: https://doi.org/10.1007/s00348-009-0639-0