Cascading of water down the sloping sides of a deep lake in winter


Thorpe, S.A. (2001) Cascading of water down the sloping sides of a deep lake in winter. Geophysical Research Letters, 28, (10), 2093-2096. (doi:10.1029/2000GL012599).

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Original Publication URL: http://dx.doi.org/10.1029/2000GL012599

Description/Abstract

During winter, the temperature of the water overlying the shallow, typically 2–5 m deep, ‘shelf’ region around the edge of the 310 m deep Lake Geneva falls more rapidly than that over deeper areas. This causes the spilling or ‘cascading’ of relatively dense water from the shallows down the sloping sides of the lake in the form of gravity currents, 2–15 m thick and typically 0.1 °C cooler than the ambient. The flow is intermittent with ‘slugs’ of cold water lasting, on average, for 8 hrs with mean downslope speeds of 5.2 cms−1. The temperature and thickness of the slugs is however variable, with pulses of colder water lasting for 1–3 hrs, each preceded by a ‘front’ in which thickness increases and temperature falls by about 0.01 °C per min. The net volume flux carried by the ‘slugs’ is 18.5 times the mean winter flow into the lake from rivers.

Item Type: Article
Related URLs:
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 1254
Date Deposited: 07 Apr 2004
Last Modified: 27 Mar 2014 17:59
URI: http://eprints.soton.ac.uk/id/eprint/1254

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