为了研究鲅鱼圈热电厂温排水的热污染问题，对其附近海域的潮流和水温扩散进行了现场观测，同时利用RMA-10三维有限元模型建立了辽东湾的水动力模型，对辽东湾的潮流场进行了较为准确的模拟。在辽东湾水动力模型的基础上，调用热量收支模块进一步模拟了鲅鱼圈热电厂附近海域海水温升场的分布，得到温升场的扩散范围。模型模拟结果表明：（1）温排水对电厂邻近海域温度分布的影响明显，鲅鱼圈海域表层海水受电厂温排水影响温升在1 °C上的面积平均值为0.648 km2，温升在4 °C上的面积平均值为0.199 km2；底层海水受电厂温排水影响温升在1 °C上的面积平均值为0.208 km2，温升在4 °C上的面积平均值为0.079 km2；（2）热羽面积变化趋势与涨、落潮过程密切相关，同一潮次中落憩时刻热羽面积大于涨憩时刻。这是因为落潮时海水从港湾向外海流出，温排水更易于外流扩散，等温线向外扩展延伸范围更大；而在涨潮时海水从外海涌入港湾，温排水不易外流扩散，等温线向港湾内收缩；（3）海水温升分布呈现出较明显的垂向差异，表层温升面积为底层温升面积的2~4倍。说明由于温差所产生的浮力效应，使得温排水主要集中于海水表层流动。通常采用的基于垂向平均的二维温排水数值模型无法模拟这种情况，只有建立三维模型才能对温排水引起的温升场进行更加准确地模拟。

In order to study the thermal pollution caused by cooling water discharge from Bayuquan thermal power plant, in-situ measurements on the tidal currents and the heat diffusion in the area adjacent to the power plant were conducted in this study. Three-dimensional finite element numerical model RMA-10 was also used to simulate the flow field of the Liaodong Bay, where the plant is located, and the model predicted surface elevation agrees well with the observed data. Based on the hydrodynamic simulation, a heat budget module was implemented to simulate the three-dimensional temperature rise field caused by cooling water discharge from the power plant. The primary modeling results are as follows：(1) The temperature distribution is significantly affected by the cooling water discharge. The average area with over 1 °C temperature rise in the surface and bottom is 0.648 km2 and 0.208 km2, respectively, whereas that with over 4 °C temperature rise in the surface and bottom is 0.199 km2 and 0.079 km2, respectively; (2) The extent of cooling water discharge tends to correlate directly with the tidal currents. Over a tidal cycle, the extent of the thermal plume during the ebb tide is larger than that during the flood tide as the seawater flows out from the harbor to the open sea during the ebb tide, advecting the cooling water discharge outward at the same time. On the contrary, during the flood tide, the seawater flows into the harbor from the open sea, suppressing the advection of the plume from the outfall; (3) The vertical distribution of temperature rise is not uniform, and the area with temperature rise in the surface is 2 to 4 times larger than in the bottom, suggesting that cooling water diffuses mainly in the upper layer due to the buoyancy effect. As such, the commonly used two-dimensional model may not be suitable for simulating cooling water discharge, and three-dimensional model is worth considering in such a case.