A study of temperature distribution in the sea area around Qinshan Nuclear Power Plant based on satellite remote sensing
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摘要: 以秦山核电周边海域为研究对象, 利用Landsat系列热红外遥感数据, 研究秦山核电周边海域的温度分布情况。结果显示, 温度反演结果与海上测温数据具有强相关性, 反演结果可靠; 秦山核电运行前, 周边海域温度较为均匀, 除自然增温外, 无明显温度分异现象, 沿岸南北方向上海域温度几乎无变化, 东西方向存在较小的温度梯度, 离岸10 km范围内温度变化不超过0.6 ℃; 核电运行后, 周边海域呈现水温分异现象, 温排水分布特征与潮汐和季节密切相关, 同季节落潮时刻的温升范围总体要大于涨潮, 同潮态夏季温升分布总体大于冬季; 某厂取水口处表层海水在涨潮时刻存在1.0 ℃以上温升。Landsat系列数据基本满足秦山核电周边海域温度分布研究需求, 针对特定潮态温排水分布可开展航空遥感监测。Abstract: This study investigated the temperature distribution in the sea area around the Qinshan Nuclear Power Plant using Landsat thermal infrared remote sensing data. The results indicate a strong correlation between the inversion results of temperature and the measured data, suggesting reliable inversion results. Before the operation of the nuclear power plant, the surrounding sea area exhibited relatively uniform temperature, with no significant temperature difference except for natural warming. Furthermore, the temperature along the coast remained almost unchanged in the north-south direction and displayed slight temperature gradients in the east-west direction, with temperature variation not exceeding 0.6 ℃ within 10 km from the coast. After the operation of the nuclear power, the surrounding sea area showed temperature differentiation. The distribution characteristic of thermal discharge was closely related to tides and seasons. In the same season, the increased amplitude of the temperature during ebb tides generally exceeded that during flood tide. Under the same tidal condition, the increased amplitude of the temperature in summer typically exceeded that in winter. At a certain water intake of the first plant, the surface seawater manifested a temperature rise of over 1.0 ℃ during flood tide. Landsat data generally meet the demand for research on temperature distribution in the surrounding sea area of the Qinshan Nuclear Power Plant, and the distribution of thermal discharge under specific tidal conditions can be investigated using aerial remote sensing monitoring.
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