Mixing of an interflow into the ambient water of Lake Iseo

Charlie A R Hogg, Clelia L. Marti, Herbert E. Huppert, Jörg Imberger

Research output: Contribution to journalArticle (Academic Journal)peer-review

23 Citations (Scopus)

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 inertiabuoyancy 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.

Original languageEnglish
Pages (from-to)579-592
Number of pages14
JournalLimnology and Oceanography
Volume58
Issue number2
DOIs
Publication statusPublished - 2013

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