This special section in Vadose Zone Journal aims to highlight the latest research advances and emerging developments and applications of new techniques for visualization and characterization of pore-scale processes. The interrelations among geophysical, biological, and chemical processes at the pore-scale are still not well understood, but are of crucial importance for numerous science and engineering applications. For example, it is widely known that interfacial pore-scale processes control retention of contaminants and colloids, govern multiphase flow phenomena, and mediate various mass-transfer processes such as liquid dissolution, gas exchange, or volatilization. It is also clear that many geophysical, biological, and geochemical soil...

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