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Open AccessArticle

Water Temperature Simulation in a Tropical Lake in South China

1
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
2
China Renewable Energy Engineering Institute, Beijing 100011, China
3
Appraisal Center for Environment and Engineering, The Ministry of Ecology and Environment of China, Beijing 100012, China
4
Jiangxi Provincial Water Conservancy Planning Design and Research Institute, Nanchang 330029, China
5
Jinling Institute of Technology, Nanjing 211169, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Michele Mistri and Naicheng Wu
Water 2021, 13(7), 913; https://doi.org/10.3390/w13070913
Received: 24 January 2021 / Revised: 21 March 2021 / Accepted: 23 March 2021 / Published: 27 March 2021
(This article belongs to the Special Issue Integrated Ecohydrological Models and Aquatic Ecosystem Management)
To study the vertical water temperature structure and thermodynamic characteristics of tropical lake-like reservoirs, a water temperature model was developed by a vertical one-dimensional numerical model for Songtao Reservoir in Hainan Province, China. The model was verified by the measured water temperature data, and sensitivity analysis of key model parameters was carried out. The results show that water temperature simulated by the model in Songtao Reservoir agreed with the observations quite well, and the model is feasible for water temperature simulations in large reservoirs in tropical zones. The sensitivity of vertical water temperature structure to different model parameters varied. For example, the extinction coefficient greatly affected surface water temperature, which is important for the formation and development of the surface water temperature hybrid layer. The vertical mixing coefficient significantly influenced the inflection point position and thickness of the thermocline. The vertical water temperature structure in Songtao Reservoir was stratified. Reservoir surface water temperature varied from 19.4 °C to 33.8 °C throughout a year. The hypolimnion mainly appeared in elevation below 150 m, where the water temperature is basically maintained at 19 °C throughout the year. This study also found that the surface water temperature of Songtao Reservoir in the tropical zone was higher than the air temperature throughout a year, with an annual average of 3.5 °C higher than that of air temperature. The preliminary analysis found out that the higher surface water temperature may be caused by the strong air temperature and solar radiation in tropical zones, in addition to the enhanced capacity of heat absorption and heat storage due to the slow water flow in the reservoir. View Full-Text
Keywords: tropical zone; lake-like reservoir; vertical one-dimensional numerical model; vertical water temperature structure tropical zone; lake-like reservoir; vertical one-dimensional numerical model; vertical water temperature structure
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MDPI and ACS Style

Gu, H.; Lu, B.; Qi, C.; Xiong, S.; Shen, W.; Ma, L. Water Temperature Simulation in a Tropical Lake in South China. Water 2021, 13, 913. https://doi.org/10.3390/w13070913

AMA Style

Gu H, Lu B, Qi C, Xiong S, Shen W, Ma L. Water Temperature Simulation in a Tropical Lake in South China. Water. 2021; 13(7):913. https://doi.org/10.3390/w13070913

Chicago/Turabian Style

Gu, Hongbin; Lu, Baohong; Qi, Changjun; Xiong, Si; Shen, Wenlong; Ma, Lejun. 2021. "Water Temperature Simulation in a Tropical Lake in South China" Water 13, no. 7: 913. https://doi.org/10.3390/w13070913

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