Author(s): Paolo Peruzzo; Nicola Durighetto; Gianluca Botter
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Abstract: Despite their small surface area, mountain streams are a significant source of greenhouse gases by efficient exchange processes at the water-air interface. The physical mechanisms responsible for the gas emission are modulated by the microtopography that characterizes the stream bed, whose steps and pools are peculiar examples. While it is well established that the gas transfer in correspondence with riverbed drops is promoted by the concurrence of high turbulence and bubble entrainment, a deep knowledge of the physical processes driving the outgassing dynamics in local steps still lacking. This study aims to bridge this knowledge gap by reproducing numerically the hydrodynamics of an idealized step-and-pool configuration.
Year: 2024