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Simulating Diurnal Variations of Water Temperature and Dissolved Oxygen in Shallow Minnesota Lakes
Article

Simulating Nutrients and Phytoplankton Dynamics in Lakes: Model Development and Applications

1
Department of Civil and Environmental Engineering, Auburn University, Auburn, AL 36849, USA
2
Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL 36849, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Lars Bengtsson
Water 2021, 13(15), 2088; https://doi.org/10.3390/w13152088
Received: 15 June 2021 / Revised: 26 July 2021 / Accepted: 27 July 2021 / Published: 30 July 2021
(This article belongs to the Special Issue Physical Processes in Lakes)
Due to eutrophication, many lakes require periodic management and restoration, which becomes unpredictable due to internal nutrient loading. To provide better lake management and restoration strategies, a deterministic, one-dimensional water quality model MINLAKE2020 was modified from daily MINLAKE2012 by incorporating chlorophyll-a, nutrients, and biochemical oxygen demand models into the regional year-around temperature and dissolved oxygen (DO) model. MINLAKE2020 was applied to six lakes (varying depth and trophic status) in Minnesota focusing on studying the internal nutrient dynamics. The average root-mean-square errors (RMSEs) of simulated water temperature and DO in six lakes are 1.51 °C and 2.33 mg/L, respectively, when compared with profile data over 2–4 years. The average RMSE of DO simulation decreased by 24.2% when compared to the MINLAKE2012 model. The internal nutrient dynamics was studied by analyzing time series of phosphorus, chlorophyll-a, and DO over several years and by performing a sensitivity analysis of model parameters. A long-term simulation (20 years) of Lake Elmo shows that the simulated phosphorus release from sediment under the anoxic condition results in surface phosphorus increase, which matches with the observed trends. An average internal phosphorus loading increase of 92.3 kg/year increased the average daily phosphorus concentration by 0.0087 mg/L. View Full-Text
Keywords: water quality; chlorophyll-a; phosphorus; phosphorus release; dissolved oxygen water quality; chlorophyll-a; phosphorus; phosphorus release; dissolved oxygen
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MDPI and ACS Style

Tasnim, B.; Fang, X.; Hayworth, J.S.; Tian, D. Simulating Nutrients and Phytoplankton Dynamics in Lakes: Model Development and Applications. Water 2021, 13, 2088. https://doi.org/10.3390/w13152088

AMA Style

Tasnim B, Fang X, Hayworth JS, Tian D. Simulating Nutrients and Phytoplankton Dynamics in Lakes: Model Development and Applications. Water. 2021; 13(15):2088. https://doi.org/10.3390/w13152088

Chicago/Turabian Style

Tasnim, Bushra, Xing Fang, Joel S. Hayworth, and Di Tian. 2021. "Simulating Nutrients and Phytoplankton Dynamics in Lakes: Model Development and Applications" Water 13, no. 15: 2088. https://doi.org/10.3390/w13152088

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