TY  - JOUR
A1  - Dong, Fei
A1  - Mi, Chenxi
A1  - Hupfer, Michael
A1  - Lindenschmidt, Karl-Erich
A1  - Peng, Wenqi
A1  - Liu, Xiaobo
A1  - Rinke, Karsten
T1  - Assessing vertical diffusion in a stratified lake using a three-dimensional hydrodynamic model
Y1  - 2019
VL  - 34
IS  - 5
SP  - 1131
EP  - 1143
JF  - Hydrological Processes
DO  - 10.1002/hyp.13653
DO  - 10.23689/fidgeo-4588
N2  - Vertical turbulent diffusivity (Kz), which can be estimated from water temperature, is a key factor in the evolution of water quality in lentic waters. In this study, we analysed the capability of a three-dimensional hydrodynamic model (EFDC) to capture water temperature and vertical diffusivity in Lake Arendsee in the Northern German plain. Of particular interest to us is to evaluate the model performance for capturing the diffusion minimum within the metalimnion and analyse the response of the metalimnetic Kz to meteorological forcing, namely changing wind speed and warming. The comparison confirmed that the calibrated model could reproduce both stratification dynamics and vertical diffusion profiles in the lake. The model was also shown to be able to capture the duration and vertical extent of the metalimnetic diffusion minimum. The scenario results illustrate that, compared to air temperature, wind velocity appeared to be the more influential meteorological variable on the vertical exchange within the metalimnion. While increasing wind velocities mostly affected the minimum values of Kz in the metalimnion and thus led to intensified vertical exchange, the reduction of wind velocity mostly affected the depth of minimal Kz, but not its absolute value.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8934
ER  -