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Water 2017, 9(4), 254; doi:10.3390/w9040254

Seasonal Variation in Sediment Oxygen Demand in a Northern Chained River-Lake System

Global Institute for Water Security, University of Saskatchewan, 11 Innovation Boulevard, Saskatoon, SK S7N 3H5, Canada
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Academic Editor: Jiangyong Hu
Received: 21 January 2017 / Revised: 30 March 2017 / Accepted: 30 March 2017 / Published: 5 April 2017
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Abstract

Sediment oxygen demand (SOD) contributes immensely to hypolimnetic oxygen depletion. SOD rates thus play a key role in aquatic ecosystems’ health predictions. These rates, however, can be very expensive to sample. Moreover, determination of SOD rates by sediment diagenesis modeling may require very large datasets, or may not be easily adapted to complex aquatic systems. Water quality modeling for northern aquatic systems is emerging and little is known about the seasonal trends of SOD rates for complex aquatic systems. In this study, the seasonal trend of SOD rates for a northern chained river-lake system has been assessed through the calibration of a water quality model. Model calibration and validation showed good agreement with field measurements. Results of the study show that, in the riverine section, SOD20 rates decreased from 1.9 to 0.79 g/m2/day as urban effluent traveled along the river while a SOD20 rate of 2.2 g/m2/day was observed in the lakes. Seasonally, the SOD20 rates in summer were three times higher than those in winter for both river and lakes. The results of the study provide insights to the seasonal trend of SOD rates especially for northern rivers and lakes and can, thus, be useful for more complex water quality modeling studies in the region. View Full-Text
Keywords: sediment oxygen demand; hydrodynamic; water quality modeling; calibration; validation; seasonal trend sediment oxygen demand; hydrodynamic; water quality modeling; calibration; validation; seasonal trend
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Akomeah, E.; Lindenschmidt, K.-E. Seasonal Variation in Sediment Oxygen Demand in a Northern Chained River-Lake System. Water 2017, 9, 254.

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