Flow topology and scalar mixing in spatially heterogeneous flow fields

被引:95
作者
de Barros, Felipe P. J. [1 ]
Dentz, Marco [2 ]
Koch, Jonas [3 ]
Nowak, Wolfgang [3 ]
机构
[1] Tech Univ Catalonia, Dept Geotech Engn & Geosci, E-08034 Barcelona, Spain
[2] IDAEA CSIC, Spanish Natl Res Council, E-08034 Barcelona, Spain
[3] Univ Stuttgart, Dept Hydromech & Modelling Hydrosyst, D-70569 Stuttgart, Germany
关键词
CHAOTIC ADVECTION; DILUTION; PARTICLES; TRANSPORT; AQUIFERS; MEDIA;
D O I
10.1029/2012GL051302
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Scalar mixing plays a significant role for transport in geophysical flows because it controls dilution and is a main driver for many chemical reactions. Here we study the local scale flow mechanisms that lead to enhanced scalar mixing, and how they impact on the global mixing behavior. Mixing is quantified in terms of the entropy of the scalar distribution. It is shown that the evolution of entropy is directly linked to the flow topology in terms of the Okubo-Weiss parameter Theta. Dominant shear and stretching deformation (Theta > 0) leads to a strong increase of local mixing strength, while dominant vorticity (Theta < 0) has only a minor impact. This allows to delineate regions of increased scalar mixing potential by mapping out the spatial distribution of Theta(x), and to relate global scalar mixing to an areal averaged effective Okubo-Weiss measure. Citation: de Barros, F. P. J., M. Dentz, J. Koch, and W. Nowak (2012), Flow topology and scalar mixing in spatially heterogeneous flow fields, Geophys. Res. Lett., 39, L08404, doi:10.1029/2012GL051302.
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页数:5
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