Longitudinal dispersion characteristics of rivers and natural streams in Greece

Papadimitrakis, I; Orphanos, I

dc.contributor.author	Papadimitrakis, I	en
dc.contributor.author	Orphanos, I	en
dc.date.accessioned	2014-03-01T01:20:45Z
dc.date.available	2014-03-01T01:20:45Z
dc.date.issued	2004	en
dc.identifier.issn	15677230	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16029
dc.subject	Longitudinal dispersion coefficients	en
dc.subject	River hydraulics	en
dc.subject	Statistical analysis	en
dc.subject.other	channel hydraulics	en
dc.subject.other	dispersion	en
dc.subject.other	optimization	en
dc.subject.other	parameterization	en
dc.subject.other	statistical analysis	en
dc.subject.other	Eurasia	en
dc.subject.other	Europe	en
dc.subject.other	Greece	en
dc.subject.other	Southern Europe	en
dc.title	Longitudinal dispersion characteristics of rivers and natural streams in Greece	en
heal.type	journalArticle	en
heal.identifier.primary	10.1023/B:WAFO.0000044806.98243.97	en
heal.identifier.secondary	http://dx.doi.org/10.1023/B:WAFO.0000044806.98243.97	en
heal.publicationDate	2004	en
heal.abstract	An optimized parameterization of the non-dimensional longitudinal dispersion coefficients in Greek rivers, Kxa, is described in terms of parameters derived from cross-section river geometry and longitudinal velocity data. Optimization is accomplished, using various combinations of the selected parameters, either for subsets of Kxa values, according to the cross-section aspect ratio range, or for the entire Kxa population. The use of shape factors associated with the river cross-section transverse profiles of depth-mean longitudinal velocities and the normalized intensities of longitudinal velocity variations from the overall mean cross-sectional velocity improves the parameterization. The statistical behavior of Kxa in terms of skewness, flatness and other shape coefficients is also examined. Kxa histograms show that these coefficients have a log-normal distribution. An empirical expression for Kxa is also proposed that takes into account both contributions from the transverse velocity profile and from the vertical profile of longitudinal velocities, at each cross-section, in shaping the value of dispersion coefficients when the aspect ratio of the cross-section is of O(1) and/or when Kxa is of O(1). © 2004 Kluwer Academic Publishers.	en
heal.journalName	Water, Air, and Soil Pollution: Focus	en
dc.identifier.doi	10.1023/B:WAFO.0000044806.98243.97	en
dc.identifier.volume	4	en
dc.identifier.issue	4-5	en
dc.identifier.spage	289	en
dc.identifier.epage	305	en