Study on Re-Aeration by Waves

Hosoi, Masanobu; Ishida, Akira; Imoto, Kuniyoshi

doi:10.1080/05785634.1977.11924253

Cited by 10 publications

(9 citation statements)

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“…The correlation coefficient of the experimental values of K L with the proposed equations results is particularly high (R 2 =0.78) compared to respective correlations published by Hosoi et al (1977) and Daniil and Gulliver (1991). Oxygen transfer coefficients from the experimental measurements, as computed using Eq.…”

Section: Model Formulationmentioning

confidence: 56%

Gas transfer under breaking waves: experiments and an improved vorticity-based model

Tsoukala

Moutzouris²

2008

Ann. Geophys.

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Abstract. In the present paper a modified vorticity-based model for gas transfer under breaking waves in the absence of significant wind forcing is presented. A theoretically valid and practically applicable mathematical expression is suggested for the assessment of the oxygen transfer coefficient in the area of wave-breaking. The proposed model is based on the theory of surface renewal that expresses the oxygen transfer coefficient as a function of both the wave vorticity and the Reynolds wave number for breaking waves.Experimental data were collected in wave flumes of various scales: a) small-scale experiments were carried out using both a sloping beach and a rubble-mound breakwater in the wave flume of the Laboratory of Harbor Works, NTUA, Greece; b) large-scale experiments were carried out with a sloping beach in the wind-wave flume of Delft Hydraulics, the Netherlands, and with a three-layer rubble mound breakwater in the Schneideberg Wave Flume of the Franzius Institute, University of Hannover, Germany.The experimental data acquired from both the small-and large-scale experiments were in good agreement with the proposed model. Although the apparent transfer coefficients from the large-scale experiments were lower than those determined from the small-scale experiments, the actual oxygen transfer coefficients, as calculated using a discretized form of the transport equation, are in the same order of magnitude for both the small-and large-scale experiments. The validity of the proposed model is compared to experimental results from other researchers.Although the results are encouraging, additional research is needed, to incorporate the influence of bubble mediated gas exchange, before these results are used for an environmental friendly design of harbor works, or for projects involving waste disposal at sea.

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Section: Model Formulationmentioning

confidence: 56%

Gas transfer under breaking waves: experiments and an improved vorticity-based model

Tsoukala

Moutzouris²

2008

Ann. Geophys.

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“…The straight lines correspond to the relation given by Equations . In the upper graph of Figure , the classical data obtained by Downing and Truesdale and Hosoi et al are also shown.…”

Section: Discussionmentioning

confidence: 80%

“…[45] The straight lines correspond to the relation given by Equations (8). In the upper graph of Figure 7, the classical data obtained by Downing and Truesdale [42] and Hosoi et al [43] are also shown. For the case of gas transfer due to wind generated water waves, J€ ahne et al [37] were pioneering in proposing that k L depends on the total mean square slope of the water waves.…”

Section: Comparison With Previous Datamentioning

confidence: 82%

“…[32,[35][36][37][38][39][40] A summary and comparison among different formulas for estimating the reaeration coefficient due to wind in still water bodies are provided by Ro et al [41] After the pioneering work of Downing and Truesdale [42] on the effect that mechanically generated waves have in the reaeration coefficient, several other authors have addressed the problem. [43][44][45][46][47][48][49] J€ ahne et al [37][38] established the importance of gravity waves, which are characterized by their mean square slope, in the gas transfer process. Thais and Magnaudet [50] showed the validity of the use of a superposition of mechanically generated waves and wind waves as a way to achieve effective fetches longer than the water tank dimensions.…”

Section: Previous Researchmentioning

confidence: 99%

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Wave and wind effects on the oxygen transfer across an air‐water interface: An experimental study

Tamburrino

Martínez

2017

Can J Chem Eng

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The results of an experimental study on the oxygen transfer across the air‐water interface under the combined effect of wind and mechanically generated waves are presented in the paper. The experiments were carried out in a wind tunnel containing a water tank. From the analysis of the experimental data, a relationship for determining the gas transfer coefficient was obtained, and found that the mean square slope of the water waves, the wave celerity, the wind shear velocity, and the Schmidt number are the relevant variables involved in the phenomena. The results of this study can be considered as a contribution to the advancement of the phenomenon of reaeration in closed water bodies subjected to waves and wind, such as reservoirs and lakes.

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“…27 Hence, wind must always be allowed free access. There is the now nearclassic example from Chingóla in Zambia 23 where a system of ponds operating in a largely aerobic manner was hidden from view behind a 2-m-high solid fence.…”

Section: Crc Critical Reviews In Environmental Controlmentioning

confidence: 99%