What is it about?
Varying systematically the bulk-mean velocity and water depth, laboratory flume experiments were conducted and we measured surface velocities and dissolved oxygen (DO) concentrations in open-channel flows to reveal the relationship between DO transfer velocity and surface divergence. The result implies that interfacial gas transfer is related to bottom-situated turbulence motion and vertical mass transfer.
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Why is it important?
Air / water interfacial gas transfer through free surface plays a significant role in preserving and restoring water quality in creeks and rivers. However, direct measurements of gas transfer velocity and reaeration coefficient are still difficult, and therefore a reliable prediction model needs to be developed.
Read the Original
This page is a summary of: Surface velocity divergence model of air/water interfacial gas transfer in open-channel flows, Physics of Fluids, April 2017, American Institute of Physics, DOI: 10.1063/1.4981228.
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