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Title (Primary) Internal waves and mixing in a stratified reservoir: insights from three-dimensional modeling
Author Bocaniov, S.A.; Ullmann, C.; Rinke, K.; Lamb, K.G.; Boehrer, B.;
Journal Limnologica
Year 2014
Department ASAM; SEEFO;
Volume 49
Language englisch;
POF III (all) T32;
UFZ wide themes TERENO; RU2;
Abstract In this study, the 3-dimensional (3D) Estuary and Lake Computer Model (ELCOM) was used to model a mid-sized reservoir (Rappbode Reservoir, Germany) during the period of summer stratification to identify and illustrate the source of internal waves as well as to characterize the water exchange between the hypolimnion and epilimnion under different wind speed conditions with a focal point on one episode of high and sustained winds. The modeling revealed that wind stress was the key driver of the observed internal waves while the role of water withdrawal was negligible. Our results also showed that within the range of wind speeds considered, wind-induced upwelling greatly enhanced mixing between the hypolimnion and epilimnion with a rate that varies approximately as the square of the wind speed. This numerical correlation affirmed that processes connected to wind stress, i.e. internal waves or direct upwelling, were responsible for the mixing of the hypolimnetic water into the surface water rather than direct input of turbulent kinetic energy.
ID 15149
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=15149
Bocaniov, S.A., Ullmann, C., Rinke, K., Lamb, K.G., Boehrer, B. (2014):
Internal waves and mixing in a stratified reservoir: insights from three-dimensional modeling
Limnologica 49 , 52 - 67