Horizontal turbulent mixing dynamics on large-scale and fine-scale in Lake Geneva
Abstract
Based upon measurements from the period of destratification of 1981 until the destratified one of the following year an investigation is carried out on turbulent mixing dynamics in Lake Geneva. High frequency current fluctuation components are determined for different ranges of decreasing lower limits by filtering the synoptic frequency field on the basis of kinetic energy spectra. The data is investigated by means of current rose analysis accomplishing a sensitivity analysis. They serve to calculate horizontal turbulent mixing coefficients; eddy viscosity, by the Ertel-Shtokman length scale method and eddy diffusion coefficients, by the integral time scale method. The evolution of the mixing coefficients related to the determined frequency ranges of the current fluctuations is studied. Their seasonal variation as well as that due to intense wind forcing are investigated.
- Publication:
-
In its Activities Report of the Laboratory for Hydraulic Research 18 p (SEE N91-20432 12-34
- Pub Date:
- 1990
- Bibcode:
- 1990arlh.rept.....V
- Keywords:
-
- Annual Variations;
- Lakes;
- Limnology;
- Mixing Layers (Fluids);
- Turbulent Mixing;
- Hydrology;
- Mixing Height;
- Switzerland;
- Water Circulation;
- Fluid Mechanics and Heat Transfer