A VORTICITY-BASED MODEL FOR GAS TRANSFER UNDER BREAKING WAVES

DANIIL, EI; MOUTZOURIS, CI

dc.contributor.author	DANIIL, EI	en
dc.contributor.author	MOUTZOURIS, CI	en
dc.date.accessioned	2014-03-01T01:43:49Z
dc.date.available	2014-03-01T01:43:49Z
dc.date.issued	1995	en
dc.identifier.issn	0992-7689	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24208
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.other	WIND-SPEED	en
dc.subject.other	EXCHANGE	en
dc.subject.other	BUBBLES	en
dc.subject.other	WATER	en
dc.title	A VORTICITY-BASED MODEL FOR GAS TRANSFER UNDER BREAKING WAVES	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	This paper presents a new renewal model for gas transfer under the influence of breaking waves. It is proposed that the renewal rate is proportional to the vorticity of the waves at the water surface. Constants were evaluated from experimental data obtained in a wave flume at the Laboratory of Harbour Works Athens. Experiments on oxygenation due to breaking waves on a uniformly sloping beach and on a rubble mound breakwater of the S-type were performed. The water was chemically deoxygenated and dissolved oxygen (D.O.) concentration was followed over time in characteristic locations. Experimental data showed that the transfer velocity increased with increasing wave height for waves of the same frequency. Experiments with waves of the same wave height but increasing wave frequency showed also an increase in transfer velocity. The one-dimensional transport equation was used for the determination of the transfer coefficients. Preliminary analysis of the data indicated that the transfer coefficients varied almost linearly with the vertical wave velocity at the water surface. A rather good linear correlation was obtained for the breaking wave data, with a much higher slope as compared to the case of non-breaking waves. Further, an additional positive influence of the wave steepness on the dimensionless transfer coefficient was shown. However, in both of these correlations there was a distinct difference between sets with different wave frequencies. For the vorticity-based model presented in the paper no such difference appears between different sets of data. Two equations, with high correlation coefficients, are obtained, one for the breaking waves on the sloping beach and one for the breaking waves on the breakwater. The breakwater data give lower transfer velocities as compared to the sloping beach data for the same wave characteristics.	en
heal.publisher	SPRINGER VERLAG	en
heal.journalName	ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES	en
dc.identifier.isi	ISI:A1995TE38100004	en
dc.identifier.volume	13	en
dc.identifier.issue	10	en
dc.identifier.spage	1039	en
dc.identifier.epage	1046	en