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Physical modelling of the Akkajaure reservoir
SMHI, Professional Services. SMHI, Research Department, Oceanography.
2003 (English)In: Hydrology and Earth System Sciences, ISSN 1027-5606, E-ISSN 1607-7938, Vol. 7, no 3, 268-282 p.Article in journal (Refereed) Published
Abstract [en]

This paper describes the seasonal temperature development in the Akkajaure reservoir. one of the largest Swedish reservoirs. It lies in the headwaters of the river Lulealven in northern Sweden: it is 60 km long and 5 km wide with a maximum depth of 92 m. The maximum allowed variation in surface water level is 30 m. The temperature field in the reservoir is important for many biochemical processes. A one-dimensional lake model of the Akkajaure reservoir is developed from a lake model by Sahlberg (1983 and 1988). The dynamic eddy viscosity is calculated by a two equation turbulence model, a k-epsilon model and the hypolimnic eddy diffusivity formulation which is a function of the stability frequency (Hondzo et al., 1993). A comparison between calculated and measured temperature profiles showed a maximum discrepancy of 0.5-1.0degreesC over the period 1999-2002. Except for a few days in summer, the water temperature is vertically homogeneous. Over that period of years, a weak stratification of temperature occurred on only one to two weeks a year on different dates in July and August. This will have biological consequences.

Place, publisher, year, edition, pages
2003. Vol. 7, no 3, 268-282 p.
Keyword [en]
temperature profile, reservoir, 1-D lake model, stratification, Sweden
National Category
Oceanography, Hydrology, Water Resources
Research subject
URN: urn:nbn:se:smhi:diva-1347ISI: 000188007700002OAI: diva2:846384
Available from: 2015-08-17 Created: 2015-07-29 Last updated: 2015-08-17Bibliographically approved

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