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Winter 3D T-S-ρ Structures and Dispersion of Thermal Discharge near Tianwan NPP
Yutao Cheng1, Xiaotian Dong1, Hongya Lu2, Guochang Sun3, Jian Wang1 and Weicheng Lv1
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DOI:10.17265/2162-5298/2026.01.004
1. Jiangsu Ocean University, Lianyungang 222005, China 2. Lianyungang Water Resources Planning and Design Institute Co., Ltd., Lianyungang 210007, China 3. Lianyun District Bureau of Agriculture and Rural Affairs, Lianyungang 222043, China
A mathematical model of thermal effluent dispersion was developed for the TNPP (Tianwan Nuclear Power Plant) and rigorously validated against available observations. Using the validated model, the spatial extent of the 1-4 °C temperature-rise zone was quantified, and the temperature field characteristics in plan view, along vertical sections, and along water columns were systematically investigated. The results show that the vertical temperature gradient ranges from -0.34 to 1.10 °C m⁻¹. The gradient increases toward the outfall; specifically, the tidally averaged water-column temperature gradient decreases from 0.18 °C m⁻¹ at Station 3# to 0.08 °C m⁻¹ at Station 14#. Vertical mixing is stronger during spring tides, whereas during neap tides the tidally averaged water-column temperature gradient is higher than that during spring tides by 0.02-0.17 °C m⁻¹. Along the dominant transport pathway, the tidally averaged horizontal (along-path) temperature gradient is approximately 0.88-1.02 °C km⁻¹.
Thermal discharge, water temperature distribution, salinity distribution, density distribution, three-dimensional dispersion, marine ecology.
Yutao Cheng, Xiaotian Dong, Hongya Lu,et al.Winter 3D T-S-ρ Structures and Dispersion of Thermal Discharge near Tianwan NPP.Journal of Environmental Science and Engineering A 15 (2026) 31-39
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