Mixing of an interflow into the ambient water of Lake Iseo

Hogg, Charlie AR and Marti, Clelia L. and Huppert, Herbert E. and Imberger, Jörg (2013) Mixing of an interflow into the ambient water of Lake Iseo. Limnology and Oceanography, 58 (2). pp. 579-592. ISSN 024-3590, eISSN: 1939-5590 DOI 10.4319/lo.2013.58.2.0579

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Abstract

River water flowing as an interflow was investigated using field data, collected in Lake Iseo (Italy), and theory. A theory for the lateral falling mechanism of plunging was developed for inflows when the initial densimetric Froude number (Fr0) is slightly larger than unity. The ratio of the river width to the offshore extent of the plunge region was equal to Fr0. The mixing ratio in the plunge region was 0.06. Theoretical results were quantitatively consistent with the length scale and mixing ratio of the observed plunge region. The progression of the inflow was interpreted as: initially a laterally falling plunge region with little mixing; followed by a steep underflow region with substantial mixing; and finally an intrusion. The intrusion was at first controlled dynamically by an inertia-buoyancy force balance. Further from the liftoff point, turbulent mixing effects dominated over those due to inertia. Ultimately, the intrusion diffused into the adjacent layers in such a way that the interflow fluid was effectively indistinguishable from the lake water.

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA65;
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Limnology and Oceanography
Volume: 58
Page Range: pp. 579-592
Identification Number: 10.4319/lo.2013.58.2.0579
Depositing User: Sarah Humbert
Date Deposited: 25 May 2013 12:54
Last Modified: 23 Jul 2013 10:06
URI: http://eprints.esc.cam.ac.uk/id/eprint/2794

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