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Turbulence-Based Models for Gas Transfer Analysis with Channel Shape Factor Influence

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Abstract

Gas transfer through surface water of streams is an effective process for the environmental quality of the aquatic ecosystem. Several theoretical approaches have been proposed to estimate gas transfer rate. This paper is devoted to present a turbulence-based model and to compare it with other 3 turbulence-based modeling frameworks that provide an estimation of gas-transfer coefficient KL at the air-water interface. These models were derived for the reaeration process. In this paper, they have been verified both for reaeration and volatilization using experimental data collected in a laboratory rectangular flume and in a circular sewer reach. These data refer to oxygen absorption and cyclohexane volatilization, respectively. Comparison of results for oxygen shows that the tested models exhibit an average absolute difference between their results and the experimental data ranging from 12.5% and 25.6%. Also, the scaling analysis of the experimental data support both small-eddy based models and the model proposed by the authors. Moreover, volatilization results show that the process is also affected by a channel shape factor, which was, finally, quantified.

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Authors and Affiliations

  1. Hydraulic and Environmental Engineering Department ‘Girolamo Ippolito’, University of Napoli ‘Federico II’, Via Claudio, 21 - 80125, Napoli, Italy

    Carlo Gualtieri & Paola Gualtieri

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  1. Carlo Gualtieri
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  2. Paola Gualtieri
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Correspondence to Carlo Gualtieri.

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Gualtieri, C., Gualtieri, P. Turbulence-Based Models for Gas Transfer Analysis with Channel Shape Factor Influence. Environmental Fluid Mechanics 4, 249–271 (2004). https://doi.org/10.1023/B:EFMC.0000024221.82818.70

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