Gas Transfer at Hydraulic Structures

by American Society of Civil Engineers,
Task Committee on Gas Transfer at Hydraulic Structures, Technical Committee on Hydraulic Structures, ASCE


Document Type: Proceeding Paper

Part of: Air-Water Mass Transfer

Abstract: The objective of this paper is to identify and briefly summarize the state-of-the-art in measuring and describing gas transfer at hydraulic structures. Basic theory of mass transfer at the air-water interface is presented. The physical processes at hydraulic structures, such as air entrainment and turbulent mixing, open channel flow, closed-conduit (two-phase) flow, and effects of sub- and super-atmospheric pressures, that significantly impact gas transfer are identified. The fluid mechanics of flow at a variety of hydraulic structures are reviewed with their impact on gas transfer noted. Existing data and current measurement, evaluation, and predictive techniques are identified.

Subject Headings: Hydraulic structures | Gas flow | Open channel flow | Mass transfer | Entrainment | Air flow | Pressurized flow | Stratified flow

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