Author(s): Arve M. Tvede

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Abstract: The long and deep Lake Mjosa has become increasingly polluted. Proposed hydro-electric development plans may, if effectuated, deteriorate the situation. On this background, a programme to monitor the temperature conditions of the lake was started in 1973. From these measurements, the total heat storage at the end of three winters are calculated and found to deviate somewhat. The lake itself was colder after a mild winter, when only 27% of the lake had an ice cover, then after two colder winters when all of the lake became ice covered. The yield from the different components in the energy exchange budget are calculated for each winter month. The calculations show that the total energy loss from the lake was roughly 30x10^16 joule for all the winters. The validity of the calculations is tested against the measured energy loss and is found to be good. It is concluded that the total energy loss from the lake in different winters will show small variations only. The heat loss is regulated by the extent of ice and snow on the lake. Thus, the differences in heat storage must be a residue 'from the preceding summer and autumn.

DOI:

Year: 1978