Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
Estimates of the temperature flux-temperature gradient relation above a sea floor
Cimatoribus, A.; van Haren, H. (2016). Estimates of the temperature flux-temperature gradient relation above a sea floor. J. Fluid Mech. 793: 504- 523. dx.doi.org/10.1017/jfm.2016.112
In: Journal of Fluid Mechanics. Cambridge University Press: London. ISSN 0022-1120; e-ISSN 1469-7645, meer
|   |
| Abstract |
The relation between the ux of temperature (or buoyancy), the verti-cal temperature gradient and the height above the bottom, is investigatedin an oceanographic context, using high-resolution temperature measure-ments. The model for the evolution of a strati?ed layer by Balmforthet al. (1998) is reviewed and adapted to the case of a turbulent owabove a wall. Model predictions are compared to the average observa-tional estimates of the ux, exploiting a ux estimation method proposedby Winters & D'Asaro (1996). This estimation method enables the dis-entanglement of the dependence of the average ux on the height abovethe bottom and on the background temperature gradient. The classicalN-shaped ux-gradient relation is found in the observations. Model andobservations show similar qualitative behaviour, despite the strong sim-pli?cations used in the model. The results shed light on the modulationof the temperature ux by the presence of the boundary, and support theidea of a turbulent ux following a mixing-length argument in a strati?edow. Furthermore, the results support the use of Thorpe scales close to aboundary, if su?cient averaging is performed, suggesting that the Thorpescales are a?ected by the boundary in a similar way as the mixing length. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
