Thermische Energieflüsse an der Wasseroberfläche: Beispiel Sempachersee |
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| Authors: | Marti Dorrit E Imboden Dieter M |
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| Institution: | (1) Present address: Anstalf für Wasserversorgung, Abwasserreinigung und Gew?sserschutz (EAWAG/ETH), CH-8600 Dübendorf |
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| Abstract: | Data collected every 20 minutes for 18 months by a meteorological buoy moored on Lake Sempach in Switzerland (maximum depth
86 m, surface area 14.1 km2) are used to calculate different processes contributing to the net heat flux between water and atmosphere. The processes
considered are shortwave and longwave radiation, evaporation/condensation and sensible heat transfer. The temporal resolution
of the measurements allows the evaluation of the processes occurring on three different time scales: diurnal variations, weather
events of a few days and yearly cycles. The heat content of the lake is calculated from quasi-continuous measurements of water
temperature at different depths. The yearly amplitude of the heat content is 1100·106 J/m2. Short-time variations of the heat flux determined from water temperature analysis agree well with the flux variations modeled
using meteorological data. However, the latter generally underestimates the measured net heat flux in the long term. Wind
measurements, together with the net heat flux, are used to calculate the Flux Richardson Number and the Monin-Obukov Length.
Examples are given to show the predominant influence of the wind on the stratification of the upper water column and thus
on the surface water temperature.
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