Speaker
Hugo N. Ulloa
(EPFL - EPF Lausanne)
Description
In ice-covered enclosed water basins, the primary source of energy is the fraction of solar radiation that penetrates across the ice and reaches waters usually found below the temperature of maximum density. The radiative buoyancy flux works directly into the bulk, forcing increments of temperature/density in the upper fluid volume, which can become gravitationally unstable and drive convection. In this work, we formulate the mechanical energy budget and its energetics in an ice-covered Boussinesq flow forced only by solar radiation, and we introduce the 'cumulative mixing efficiency' to quantify the mixing over the diurnal time-scale. This work provides a framework to examine physical processes in ice-covered lakes.
Authors
Hugo N. Ulloa
(EPFL - EPF Lausanne)
Prof.
Alfred Wüest
(EAWAG EPFL)
Dr
Damien Bouffard
(EAWAG)
