Gas transfer at hydraulic structures is an important source or sink of
dissolved gas in a river system, even though the water is in contact with
the structure for a short period of time. The primary reason is that
bubbles are entrained into the flow, greatly increasing the surface area
available for transfer. Thus, the same gas transfer that might require
several miles of stream can occur at a waterfall or hydraulic structure, such
as an overflow weir or a spillway [Thene and Gulliver, 1988].
Thene, John R.; Gulliver, John S..
Gas Transfer at Weirs Using the Hydrocarbon Gas Tracer Methid With Headspace Analysis.
St. Anthony Falls Hydraulic Laboratory.
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