Monsoons and Tide-Induced Eddies Deflect the Dispersion of the Thermal Plume in Nan Wan Bay

Author:

Lee Hung-Jen1ORCID,Huang Shih-Jen1,Meng Pei-Jie234ORCID,Chen Chung-Chi25ORCID,Ho Chia-Ying1,Tsai Yi-Chen1ORCID

Affiliation:

1. Department of Marine Environmental Informatics, National Taiwan Ocean University, Keelung 202301, Taiwan

2. Institute of Marine Biology, National Dong Hwa University, Pingtung 94450, Taiwan

3. Taiwan Ocean Research Institute, National Applied Research Laboratories, Kaohsiung 85243, Taiwan

4. Department of Oceanography, National Sun Yat-sen University, Kaohsiung 80424, Taiwan

5. Department of Life Science, National Taiwan Normal University, Taipei 11677, Taiwan

Abstract

The present work employs a three-dimensional ocean model (MITgcm) driven by tidal and climatological forcings to assess the range of impacts of thermal wastewater discharge from the Third Nuclear Power Plant (NP_No.3) in Nan Wan Bay on the local ecosystem. Tides and daily wind forcings are incorporated into the MITgcm to examine their effects on thermal plume dispersion and water circulation in Nan Wan Bay. The model results reveal that the thermal plume is most likely to disperse to the southwest in the summer; it is unlikely to drift to the southeast or northeast because of the presence of the gentle southwesterly monsoon. In the winter, the thermal plume is most likely to be directed to the southwest and is unlikely to be directed to the northeast or southeast because of the prevailing northeasterly monsoon. Additionally, it is worth emphasizing that strong tidal currents generate a pair of counter-rotating eddies that significantly influence the dispersion of the thermal plume. However, seasonal monsoons also play an essential role in modifying the thermal plume’s direction and dispersion.

Funder

NSTC of Taiwan

CWB of Taiwan

MOST and NSTC of Taiwan

Publisher

MDPI AG

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