Numerical study of the thermal structure of a stratified temperate monomictic water reservoir

Fuxin Zhang; Hong Zhang; Edoardo Bertone; Rodney Stewart; Charles Lemckert; Kathy Cinque

doi:10.1016/j.ejrh.2020.100699

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Numerical study of the thermal structure of a stratified temperate monomictic water reservoir

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Numerical study of the thermal structure of a stratified temperate monomictic water reservoir

Fuxin Zhang, Hong Zhang, Edoardo Bertone, Rodney Stewart, Charles Lemckert and Kathy Cinque

Journal of hydrology. Regional studies, Vol.30, pp.1-21

08/2020

DOI: https://doi.org/10.1016/j.ejrh.2020.100699

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Abstract

Physical Sciences

Science & Technology

Water Resources

Hydrodynamic modelling

Stratification

Schmidt stability

Tarago Reservoir

Study region: Tarago Reservoir, Victoria, Australia. Study focus: This study investigates the influence of rainfall, river inflow and wind on the temperature stratification of the Tarago Reservoir by incorporating atmospheric and bathymetric conditions using a three-dimensional hydrodynamic model. New hydrological insights for this region: In this study, a three-dimensional (3D) hydrodynamic model was developed and applied to the Tarago Reservoir. The model allowed 3D visualization of the thermal structure, and the seasonal and longitudinal differences in stratification could be quantified using the Schmidt stability index. The simulation results revealed longitudinal differences in thermal structure among the riverine, transition, and lacustrine zones. The bathymetry affects the lake stratification and stability; furthermore, the strong vertical current caused by the sharp bathymetry gradient significantly weakens the stability in deep zones. In addition, this study assessed the impacts of rainfall and wind on lake stability using sensitivity analysis. The results indicated that rainfall decreases the water temperature of the lake but hardly affects the summer stratification. Moreover, the wind not only influences the intensity and duration of stratification but also contributes to the heat storage of waterbodies. The patterns of water current velocities and temperature also showed that the circulation generated by overflow and underflow plumes have a crucial effect on the thermal structure of the transition and lacustrine zones.

Details

Title: Numerical study of the thermal structure of a stratified temperate monomictic water reservoir
Creators: Fuxin Zhang - Griffith University
Hong Zhang - Griffith University
Edoardo Bertone - Griffith University
Rodney Stewart - Griffith University
Charles Lemckert - University of Canberra
Kathy Cinque - Melbourne Water
Publication Details: Journal of hydrology. Regional studies, Vol.30, pp.1-21
Publisher: Elsevier
Number of pages: 21
Grant note: ARC LP160100217 / Australian Government through the Australian Research Council; Australian Research Council
Identifiers: 991013056512002368
Academic Unit: Faculty of Science and Engineering
Language: English
Resource Type: Journal article

Numerical study of the thermal structure of a stratified temperate monomictic water reservoir

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