Mixing Hydrodynamics in Lake Simcoe

Researchers at Queens University deploy Nortek Aquadopp Profilers in Lake Simcoe (Ontario, Canada) to study mixing hydrodynamics.
Mixing Hydrodynamics in Lake Simcoe

Aquadopp HR Profiler deployed on Nortek AquaCross bottom frame (Photos from Damien Bouffard, Queens University)

A team of researchers at Queens University, lead by Drs. Molot, Boegman and Bouffard, deployed several Nortek Aquadopp Profilers in Lake Simcoe, Ontario for a large scale biogeochemical study. 

The focus of the study is to better predict the influence of mixing hydrodynamics and food web structure on spatial variability of phosphorus concentrations in Lake Simcoe with a 3-D model.  Relatively simple steady state models have successfully predicted average, long-term phosphorus (P) concentrations and dissolved oxygen profiles in smaller inland lakes on the Canadian Shield but have been less successful when applied to specific years in Lake Simcoe. These predictions have not been as successful as needed because the larger size and more complex shape of Lake Simcoe violates a major assumption that the lake is thoroughly mixed all year. Relatively low rates of mixing between the main basin and the two bays receiving high P inputs along with inter-annual variation in runoff and biological activity cannot be explicitly accounted for in steady state models.

 Z-Cell at Lake Simcoe

600 kHz Aquadopp Z-Cell Profiler deployed in Nortek inline frame with RBR CT sensor above.

Velocity measurements include the use of a Nortek 600 kHz Aquadopp Z-Cell Profiler, 400 kHz Aquadopp Profiler, and 2 MHz Aquadopp High Resolution (HR) Profiler.  NortekUSA supplied all of the Aquadopp Profiler and the stainless steel inline frames and aluminum AquaCross bottom frame. Thermistor chains were deployed with the Nortek ADCP's at the entrance of two bays and in the lake main basin.

These data will validate the 3-D model and therefore enable the scientists to quantify the inter-basin exchange as well as the large scale hydrodynamics of Lake Simcoe.

Thermistor chains were deployed with the Nortek ADCP's at the entrance of two bays and in the lake main basin.

These data will validate the 3-D model and therefore enable the scientists to quantify the inter-basin exchange as well as the large scale hydrodynamics of Lake Simcoe.