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

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

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2093f&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 10, p. 2093-2096

Physics

Geophysics

12

Hydrology: Limnology, Marine Geology And Geophysics: Littoral Processes, Meteorology And Atmospheric Dynamics: Convective Processes

Scientific paper

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.

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