Investigating summer thermal stratification in Lake Ontario

Arifin, R. R. and James, S. C. and de Alwis Pitts, D. A. and Hamlet, A. and Sharma, A, and Fernando, H. J. S. (2016) Investigating summer thermal stratification in Lake Ontario. In: 59th Annual Conference on Great Lakes Research., 6 - 10 June 2016, University of Guelph.

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Item Type:Conference or Workshop contribution (Poster)
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Abstract

Summer thermal stratification in Lake Ontario is simulated using the 3D
hydrodynamic model Environmental Fluid Dynamics Code (EFDC). Summer temperature
differences establish strong vertical density gradients (thermocline) between the epilimnion
and hypolimnion. Capturing the stratification and thermocline formation has been a
challenge in modeling Great Lakes. Deviating from EFDC's original Mellor-Yamada (1982)
vertical mixing scheme, we have implemented an unidimensional vertical model that uses
different eddy diffusivity formulations above and below the thermocline (Vincon-Leite,
1991; Vincon-Leite et al., 2014). The model is forced with the hourly meteorological data
from weather stations around the lake, flow data for Niagara and St. Lawrence rivers; and
lake bathymetry is interpolated on a 2-km grid. The model has 20 vertical layers following
sigma vertical coordinates. Sensitivity of the model to vertical layers' spacing is thoroughly
investigated. The model has been calibrated for appropriate solar radiation coefficients and
horizontal mixing coefficients. Overall the new implemented diffusivity algorithm shows
some successes in capturing the thermal stratification with RMSE values between 2-3°C.
Calibration of vertical mixing coefficients is under investigation to capture the improved
thermal stratification.

Keywords:lake Ontario, EFDC, Thermal Stratification
Subjects:G Mathematical and Computer Sciences > G150 Mathematical Modelling
C Biological Sciences > C160 Marine/Freshwater Biology
Divisions:College of Science > School of Engineering
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ID Code:29640
Deposited On:24 Nov 2017 13:33

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