Rotating gravity currents: small-scale and large-scale laboratory experiments and a geostrophic model
Thomas, P. J. and Linden, P. F.. (2007) Rotating gravity currents: small-scale and large-scale laboratory experiments and a geostrophic model. Journal of Fluid Mechanics, Vol.578 . pp. 35-65. ISSN 0022-1120Full text not available from this repository.
Official URL: http://dx.doi.org/10.1017/S0022112007004739
Laboratory experiments simulating gravity-driven coastal surface currents produced by estuarine fresh-water discharges into the ocean are discussed. The currents are generated inside a rotating tank filled with salt water by the continuous release of buoyant fresh water from a small source at the fluid surface. The height, the width and the length of the currents are studied as a function of the background rotation rate, the volumetric discharge rate and the density difference at the source. Two complementary experimental data sets are discussed and compared with each other. One set of experiments was carried out in a tank of diameter I m on a small-scale rotating turntable. The second set of experiments was conducted at the large-scale Coriolis Facility (LEGI, Grenoble) which has a tank of diameter 13 m. A simple geostrophic model predicting the current height, width and propagation velocity is developed. The experiments and the model are compared with each other in terms of a set of non-dimensional parameters identified in the theoretical analysis of the problem. These patameters enable the corresponding data of the large-scale and the small-scale experiments to be collapsed onto a single line. Good agreement between the model and the,experiments is found.
|Item Type:||Journal Article|
|Subjects:||T Technology > TJ Mechanical engineering and machinery
Q Science > QC Physics
|Divisions:||Faculty of Science > Engineering|
|Journal or Publication Title:||Journal of Fluid Mechanics|
|Publisher:||Cambridge University Press|
|Date:||10 May 2007|
|Number of Pages:||31|
|Page Range:||pp. 35-65|
|Access rights to Published version:||Restricted or Subscription Access|
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