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Water 2019, 11(4), 737; https://doi.org/10.3390/w11040737

Analysis of the Mixing Processes in a Shallow Subtropical Reservoir and Their Effects on Dissolved Organic Matter

1
School of Engineering and Built Environment, Griffith University, Queensland 4222, Australia
2
Cities Research Institute, Griffith University, Queensland 4222, Australia
3
Field Services, Seqwater, 117 Brisbane St., Ipswich, Queensland 4305, Australia
*
Author to whom correspondence should be addressed.
Received: 21 March 2019 / Revised: 5 April 2019 / Accepted: 6 April 2019 / Published: 9 April 2019
(This article belongs to the Section Water Resources Management and Governance)
PDF [914 KB, uploaded 9 April 2019]

Abstract

A good understanding of the physical processes of lakes or reservoirs, especially of those providing drinking water to residents, plays a vital role in water management. In this study, the water circulation and mixing processes occurring in the shallow, subtropical Tingalpa Reservoir in Australia have been investigated. Bathymetrical, meteorological, chemical and physical data collected from field measurements, laboratory analysis of water sampling and an in-situ Vertical Profile System (VPS) were analysed. Based on the high-frequency VPS dataset, a 1D model was developed to provide information for vertical transport and mixing processes. The results show that persistent high air temperature and stable reservoir water depth lead to a prolonged thermal stratification. Analysis indicates that heavy rainfalls have a significant impact on water quality when the dam level is low. The peak value of Dissolved Organic Carbon (DOC) concentration occurred in the wet season, while the specific UV absorbance (SUVA) value decreased when solar radiation increased from spring to summer. The study aims to provide a comprehensive approach for understanding and modelling the water mixing processes in similar lakes with high-frequency data from VPS’s or other monitoring systems.
Keywords: mixing processes; Vertical Profiling System; turbidity; dissolved organic matter; water temperature mixing processes; Vertical Profiling System; turbidity; dissolved organic matter; water temperature
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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Wang, X.; Zhang, H.; Bertone, E.; Stewart, R.A.; O’Halloran, K. Analysis of the Mixing Processes in a Shallow Subtropical Reservoir and Their Effects on Dissolved Organic Matter. Water 2019, 11, 737.

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