2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 9:00 AM - 9:15 AM | BRIDGING THE GAP BETWEEN LAND MANAGEMENT AND LAKE RECOVERY | 420 B
BRIDGING THE GAP BETWEEN LAND MANAGEMENT AND LAKE RECOVERY
A process-based model chain was used to quantify effectiveness of terrestrial nutrient control measures in controlling lake eutrophication and restoring lake DO concentrations in Lake Simcoe; the largest lake in Southern Ontario outside of the Great Lakes. Hydrochemical outputs from catchment models INCA-N and INCA-P drove the lake model PROTECH, which simulated water quality in the lake. Water quality responses to nutrient load reductions varied between deep and shallow lake basins. Reductions in terrestrial nutrient exports increased lake DO concentrations, however strategies which reduced tributary flow had a greater impact on lake recovery, associated with changes in water temperature and chemistry. When multiple strategies were implemented simultaneously, large flow reductions induced warming throughout the water column. Negative impacts of lake warming overwhelmed the positive effects of nutrient reduction on DO, and limited the effectiveness of restoration strategies. Lake recovery rates may be accelerated in Simcoe through coordinating management approaches, considering interactions between strategies, and the potential for physical and biological feedbacks associated with changes in lake temperature. Sensitivity of recovery rates to tributary flow and temperature has implications for management resilience under a changing climate.
- Great Lakes
- Oxygen
- Modeling
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Presenters/Authors
Jill Crossman
(), University of Windsor, jill.crossman@uwindsor.ca;
ASHA DISCLOSURE:
Financial -
Nonfinancial -